add initial CODE PixiePro board support by code-ing · Pull Request #1 · Freescale/linux-fslc

code-ing · 2015-10-21T21:15:23Z

No description provided.

This patch fixes a v4.1 only regression bug as reported by Martin where UNIT_ATTENTION checking for pre v4.2-rc1 RCU conversion code legacy se_node_acl->device_list[] was hitting a NULL pointer dereference in: [ 1858.639654] CPU: 2 PID: 1293 Comm: kworker/2:1 Tainted: G I 4.1.6-fixxcopy+ #1 [ 1858.639699] Hardware name: Dell Inc. PowerEdge R410/0N83VF, BIOS 1.11.0 07/20/2012 [ 1858.639747] Workqueue: xcopy_wq target_xcopy_do_work [target_core_mod] [ 1858.639782] task: ffff880036f0cbe0 ti: ffff880317940000 task.ti: ffff880317940000 [ 1858.639822] RIP: 0010:[<ffffffffa01d3774>] [<ffffffffa01d3774>] target_scsi3_ua_check+0x24/0x60 [target_core_mod] [ 1858.639884] RSP: 0018:ffff880317943ce0 EFLAGS: 00010282 [ 1858.639913] RAX: 0000000000000000 RBX: ffff880317943dc0 RCX: 0000000000000000 [ 1858.639950] RDX: 0000000000000000 RSI: ffff880317943dd0 RDI: ffff88030eaee408 [ 1858.639987] RBP: ffff88030eaee408 R08: 0000000000000001 R09: 0000000000000001 [ 1858.640025] R10: 0000000000000000 R11: 00000000000706e0 R12: ffff880315e0a000 [ 1858.640062] R13: ffff88030eaee408 R14: 0000000000000001 R15: ffff88030eaee408 [ 1858.640100] FS: 0000000000000000(0000) GS:ffff880322e80000(0000) knlGS:0000000000000000 [ 1858.640143] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 1858.640173] CR2: 0000000000000000 CR3: 000000000180d000 CR4: 00000000000006e0 [ 1858.640210] Stack: [ 1858.640223] ffffffffa01cadfa ffff88030eaee400 ffff880318e7c340 ffff880315e0a000 [ 1858.640267] ffffffffa01d8c25 ffff8800cae809e0 0000000000000400 0000000000000400 [ 1858.640310] ffff880318e7c3d0 0000000006b75800 0000000000080000 ffff88030eaee400 [ 1858.640354] Call Trace: [ 1858.640379] [<ffffffffa01cadfa>] ? target_setup_cmd_from_cdb+0x13a/0x2c0 [target_core_mod] [ 1858.640429] [<ffffffffa01d8c25>] ? target_xcopy_setup_pt_cmd+0x85/0x320 [target_core_mod] [ 1858.640479] [<ffffffffa01d9424>] ? target_xcopy_do_work+0x264/0x700 [target_core_mod] [ 1858.640526] [<ffffffff810ac3a0>] ? pick_next_task_fair+0x720/0x8f0 [ 1858.640562] [<ffffffff8108b3fb>] ? process_one_work+0x14b/0x430 [ 1858.640595] [<ffffffff8108bf5b>] ? worker_thread+0x6b/0x560 [ 1858.640627] [<ffffffff8108bef0>] ? rescuer_thread+0x390/0x390 [ 1858.640661] [<ffffffff810913b3>] ? kthread+0xd3/0xf0 [ 1858.640689] [<ffffffff810912e0>] ? kthread_create_on_node+0x180/0x180 Also, check for the same se_node_acl->device_list[] during EXTENDED_COPY operation as a non-holding persistent reservation port. Reported-by: Martin Svec <martin,[email protected]> Tested-by: Martin Svec <martin,[email protected]> Cc: Martin Svec <martin,[email protected]> Cc: Alex Gorbachev <[email protected]> Signed-off-by: Nicholas Bellinger <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit eddd382 upstream. Dmitry Vyukov reported the following using trinity and the memory error detector AddressSanitizer (https://code.google.com/p/address-sanitizer/wiki/AddressSanitizerForKernel). [ 124.575597] ERROR: AddressSanitizer: heap-buffer-overflow on address ffff88002e280000 [ 124.576801] ffff88002e280000 is located 131938492886538 bytes to the left of 28857600-byte region [ffffffff81282e0a, ffffffff82e0830a) [ 124.578633] Accessed by thread T10915: [ 124.579295] inlined in describe_heap_address ./arch/x86/mm/asan/report.c:164 [ 124.579295] #0 ffffffff810dd277 in asan_report_error ./arch/x86/mm/asan/report.c:278 [ 124.580137] #1 ffffffff810dc6a0 in asan_check_region ./arch/x86/mm/asan/asan.c:37 [ 124.581050] #2 ffffffff810dd423 in __tsan_read8 ??:0 [ 124.581893] #3 ffffffff8107c093 in get_wchan ./arch/x86/kernel/process_64.c:444 The address checks in the 64bit implementation of get_wchan() are wrong in several ways: - The lower bound of the stack is not the start of the stack page. It's the start of the stack page plus sizeof (struct thread_info) - The upper bound must be: top_of_stack - TOP_OF_KERNEL_STACK_PADDING - 2 * sizeof(unsigned long). The 2 * sizeof(unsigned long) is required because the stack pointer points at the frame pointer. The layout on the stack is: ... IP FP ... IP FP. So we need to make sure that both IP and FP are in the bounds. Fix the bound checks and get rid of the mix of numeric constants, u64 and unsigned long. Making all unsigned long allows us to use the same function for 32bit as well. Use READ_ONCE() when accessing the stack. This does not prevent a concurrent wakeup of the task and the stack changing, but at least it avoids TOCTOU. Also check task state at the end of the loop. Again that does not prevent concurrent changes, but it avoids walking for nothing. Add proper comments while at it. Reported-by: Dmitry Vyukov <[email protected]> Reported-by: Sasha Levin <[email protected]> Based-on-patch-from: Wolfram Gloger <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Borislav Petkov <[email protected]> Reviewed-by: Dmitry Vyukov <[email protected]> Cc: Andrey Ryabinin <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Andrey Konovalov <[email protected]> Cc: Kostya Serebryany <[email protected]> Cc: Alexander Potapenko <[email protected]> Cc: kasan-dev <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Wolfram Gloger <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Thomas Gleixner <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

…fy a fault commit 2f84a89 upstream. SunDong reported the following on https://bugzilla.kernel.org/show_bug.cgi?id=103841 I think I find a linux bug, I have the test cases is constructed. I can stable recurring problems in fedora22(4.0.4) kernel version, arch for x86_64. I construct transparent huge page, when the parent and child process with MAP_SHARE, MAP_PRIVATE way to access the same huge page area, it has the opportunity to lead to huge page copy on write failure, and then it will munmap the child corresponding mmap area, but then the child mmap area with VM_MAYSHARE attributes, child process munmap this area can trigger VM_BUG_ON in set_vma_resv_flags functions (vma - > vm_flags & VM_MAYSHARE). There were a number of problems with the report (e.g. it's hugetlbfs that triggers this, not transparent huge pages) but it was fundamentally correct in that a VM_BUG_ON in set_vma_resv_flags() can be triggered that looks like this vma ffff8804651fd0d0 start 00007fc474e00000 end 00007fc475e00000 next ffff8804651fd018 prev ffff8804651fd188 mm ffff88046b1b1800 prot 8000000000000027 anon_vma (null) vm_ops ffffffff8182a7a0 pgoff 0 file ffff88106bdb9800 private_data (null) flags: 0x84400fb(read|write|shared|mayread|maywrite|mayexec|mayshare|dontexpand|hugetlb) ------------ kernel BUG at mm/hugetlb.c:462! SMP Modules linked in: xt_pkttype xt_LOG xt_limit [..] CPU: 38 PID: 26839 Comm: map Not tainted 4.0.4-default #1 Hardware name: Dell Inc. PowerEdge R810/0TT6JF, BIOS 2.7.4 04/26/2012 set_vma_resv_flags+0x2d/0x30 The VM_BUG_ON is correct because private and shared mappings have different reservation accounting but the warning clearly shows that the VMA is shared. When a private COW fails to allocate a new page then only the process that created the VMA gets the page -- all the children unmap the page. If the children access that data in the future then they get killed. The problem is that the same file is mapped shared and private. During the COW, the allocation fails, the VMAs are traversed to unmap the other private pages but a shared VMA is found and the bug is triggered. This patch identifies such VMAs and skips them. Signed-off-by: Mel Gorman <[email protected]> Reported-by: SunDong <[email protected]> Reviewed-by: Michal Hocko <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: David Rientjes <[email protected]> Reviewed-by: Naoya Horiguchi <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 8405a8f upstream. Add code to nf_unregister_hook to flush the nf_queue when a hook is unregistered. This guarantees that the pointer that the nf_queue code retains into the nf_hook list will remain valid while a packet is queued. I tested what would happen if we do not flush queued packets and was trivially able to obtain the oops below. All that was required was to stop the nf_queue listening process, to delete all of the nf_tables, and to awaken the nf_queue listening process. > BUG: unable to handle kernel paging request at 0000000100000001 > IP: [<0000000100000001>] 0x100000001 > PGD b9c35067 PUD 0 > Oops: 0010 [#1] SMP > Modules linked in: > CPU: 0 PID: 519 Comm: lt-nfqnl_test Not tainted > task: ffff8800b9c8c050 ti: ffff8800ba9d8000 task.ti: ffff8800ba9d8000 > RIP: 0010:[<0000000100000001>] [<0000000100000001>] 0x100000001 > RSP: 0018:ffff8800ba9dba40 EFLAGS: 00010a16 > RAX: ffff8800bab48a00 RBX: ffff8800ba9dba90 RCX: ffff8800ba9dba90 > RDX: ffff8800b9c10128 RSI: ffff8800ba940900 RDI: ffff8800bab48a00 > RBP: ffff8800b9c10128 R08: ffffffff82976660 R09: ffff8800ba9dbb28 > R10: dead000000100100 R11: dead000000200200 R12: ffff8800ba940900 > R13: ffffffff8313fd50 R14: ffff8800b9c95200 R15: 0000000000000000 > FS: 00007fb91fc34700(0000) GS:ffff8800bfa00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000100000001 CR3: 00000000babfb000 CR4: 00000000000007f0 > Stack: > ffffffff8206ab0f ffffffff82982240 ffff8800bab48a00 ffff8800b9c100a8 > ffff8800b9c10100 0000000000000001 ffff8800ba940900 ffff8800b9c10128 > ffffffff8206bd65 ffff8800bfb0d5e0 ffff8800bab48a00 0000000000014dc0 > Call Trace: > [<ffffffff8206ab0f>] ? nf_iterate+0x4f/0xa0 > [<ffffffff8206bd65>] ? nf_reinject+0x125/0x190 > [<ffffffff8206dee5>] ? nfqnl_recv_verdict+0x255/0x360 > [<ffffffff81386290>] ? nla_parse+0x80/0xf0 > [<ffffffff8206c42c>] ? nfnetlink_rcv_msg+0x13c/0x240 > [<ffffffff811b2fec>] ? __memcg_kmem_get_cache+0x4c/0x150 > [<ffffffff8206c2f0>] ? nfnl_lock+0x20/0x20 > [<ffffffff82068159>] ? netlink_rcv_skb+0xa9/0xc0 > [<ffffffff820677bf>] ? netlink_unicast+0x12f/0x1c0 > [<ffffffff82067ade>] ? netlink_sendmsg+0x28e/0x650 > [<ffffffff81fdd814>] ? sock_sendmsg+0x44/0x50 > [<ffffffff81fde07b>] ? ___sys_sendmsg+0x2ab/0x2c0 > [<ffffffff810e8f73>] ? __wake_up+0x43/0x70 > [<ffffffff8141a134>] ? tty_write+0x1c4/0x2a0 > [<ffffffff81fde9f4>] ? __sys_sendmsg+0x44/0x80 > [<ffffffff823ff8d7>] ? system_call_fastpath+0x12/0x6a > Code: Bad RIP value. > RIP [<0000000100000001>] 0x100000001 > RSP <ffff8800ba9dba40> > CR2: 0000000100000001 > ---[ end trace 08eb65d42362793f ]--- Signed-off-by: "Eric W. Biederman" <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 274d835 upstream. Since 9eb1e57 drm/dp/mst: make sure mst_primary mstb is valid in work function we validate the mstb structs in the work function, and doing that takes a reference. So we should never get here with the work function running using the mstb device, only if the work function hasn't run yet or is running for another mstb. So we don't need to sync the work here, this was causing lockdep spew as below. [ +0.000160] ============================================= [ +0.000001] [ INFO: possible recursive locking detected ] [ +0.000002] 3.10.0-320.el7.rhel72.stable.backport.3.x86_64.debug #1 Tainted: G W ------------ [ +0.000001] --------------------------------------------- [ +0.000001] kworker/4:2/1262 is trying to acquire lock: [ +0.000001] ((&mgr->work)){+.+.+.}, at: [<ffffffff810b29a5>] flush_work+0x5/0x2e0 [ +0.000007] but task is already holding lock: [ +0.000001] ((&mgr->work)){+.+.+.}, at: [<ffffffff810b57e4>] process_one_work+0x1b4/0x710 [ +0.000004] other info that might help us debug this: [ +0.000001] Possible unsafe locking scenario: [ +0.000002] CPU0 [ +0.000000] ---- [ +0.000001] lock((&mgr->work)); [ +0.000002] lock((&mgr->work)); [ +0.000001] *** DEADLOCK *** [ +0.000001] May be due to missing lock nesting notation [ +0.000002] 2 locks held by kworker/4:2/1262: [ +0.000001] #0: (events_long){.+.+.+}, at: [<ffffffff810b57e4>] process_one_work+0x1b4/0x710 [ +0.000004] #1: ((&mgr->work)){+.+.+.}, at: [<ffffffff810b57e4>] process_one_work+0x1b4/0x710 [ +0.000003] stack backtrace: [ +0.000003] CPU: 4 PID: 1262 Comm: kworker/4:2 Tainted: G W ------------ 3.10.0-320.el7.rhel72.stable.backport.3.x86_64.debug #1 [ +0.000001] Hardware name: LENOVO 20EGS0R600/20EGS0R600, BIOS GNET71WW (2.19 ) 02/05/2015 [ +0.000008] Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper] [ +0.000001] ffffffff82c26c90 00000000a527b914 ffff88046399bae8 ffffffff816fe04d [ +0.000004] ffff88046399bb58 ffffffff8110f47f ffff880461438000 0001009b840fc003 [ +0.000002] ffff880461438a98 0000000000000000 0000000804dc26e1 ffffffff824a2c00 [ +0.000003] Call Trace: [ +0.000004] [<ffffffff816fe04d>] dump_stack+0x19/0x1b [ +0.000004] [<ffffffff8110f47f>] __lock_acquire+0x115f/0x1250 [ +0.000002] [<ffffffff8110fd49>] lock_acquire+0x99/0x1e0 [ +0.000002] [<ffffffff810b29a5>] ? flush_work+0x5/0x2e0 [ +0.000002] [<ffffffff810b29ee>] flush_work+0x4e/0x2e0 [ +0.000002] [<ffffffff810b29a5>] ? flush_work+0x5/0x2e0 [ +0.000004] [<ffffffff81025905>] ? native_sched_clock+0x35/0x80 [ +0.000002] [<ffffffff81025959>] ? sched_clock+0x9/0x10 [ +0.000002] [<ffffffff810da1f5>] ? local_clock+0x25/0x30 [ +0.000002] [<ffffffff8110dca9>] ? mark_held_locks+0xb9/0x140 [ +0.000003] [<ffffffff810b4ed5>] ? __cancel_work_timer+0x95/0x160 [ +0.000002] [<ffffffff810b4ee8>] __cancel_work_timer+0xa8/0x160 [ +0.000002] [<ffffffff810b4fb0>] cancel_work_sync+0x10/0x20 [ +0.000007] [<ffffffffa0160d17>] drm_dp_destroy_mst_branch_device+0x27/0x120 [drm_kms_helper] [ +0.000006] [<ffffffffa0163968>] drm_dp_mst_link_probe_work+0x78/0xa0 [drm_kms_helper] [ +0.000002] [<ffffffff810b5850>] process_one_work+0x220/0x710 [ +0.000002] [<ffffffff810b57e4>] ? process_one_work+0x1b4/0x710 [ +0.000005] [<ffffffff810b5e5b>] worker_thread+0x11b/0x3a0 [ +0.000003] [<ffffffff810b5d40>] ? process_one_work+0x710/0x710 [ +0.000002] [<ffffffff810beced>] kthread+0xed/0x100 [ +0.000003] [<ffffffff810bec00>] ? insert_kthread_work+0x80/0x80 [ +0.000003] [<ffffffff817121d8>] ret_from_fork+0x58/0x90 v2: add flush_work. Reviewed-by: Daniel Vetter <[email protected]> Signed-off-by: Dave Airlie <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit cf6f54e upstream. Fixes the following lockdep splat: [ 1.244527] ============================================= [ 1.245193] [ INFO: possible recursive locking detected ] [ 1.245193] 4.2.0-rc1+ #37 Not tainted [ 1.245193] --------------------------------------------- [ 1.245193] cp/742 is trying to acquire lock: [ 1.245193] (&sb->s_type->i_mutex_key#9){+.+.+.}, at: [<ffffffff812b3f69>] ubifs_init_security+0x29/0xb0 [ 1.245193] [ 1.245193] but task is already holding lock: [ 1.245193] (&sb->s_type->i_mutex_key#9){+.+.+.}, at: [<ffffffff81198e7f>] path_openat+0x3af/0x1280 [ 1.245193] [ 1.245193] other info that might help us debug this: [ 1.245193] Possible unsafe locking scenario: [ 1.245193] [ 1.245193] CPU0 [ 1.245193] ---- [ 1.245193] lock(&sb->s_type->i_mutex_key#9); [ 1.245193] lock(&sb->s_type->i_mutex_key#9); [ 1.245193] [ 1.245193] *** DEADLOCK *** [ 1.245193] [ 1.245193] May be due to missing lock nesting notation [ 1.245193] [ 1.245193] 2 locks held by cp/742: [ 1.245193] #0: (sb_writers#5){.+.+.+}, at: [<ffffffff811ad37f>] mnt_want_write+0x1f/0x50 [ 1.245193] #1: (&sb->s_type->i_mutex_key#9){+.+.+.}, at: [<ffffffff81198e7f>] path_openat+0x3af/0x1280 [ 1.245193] [ 1.245193] stack backtrace: [ 1.245193] CPU: 2 PID: 742 Comm: cp Not tainted 4.2.0-rc1+ #37 [ 1.245193] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140816_022509-build35 04/01/2014 [ 1.245193] ffffffff8252d530 ffff88007b023a38 ffffffff814f6f49 ffffffff810b56c5 [ 1.245193] ffff88007c30cc80 ffff88007b023af8 ffffffff810a150d ffff88007b023a68 [ 1.245193] 000000008101302a ffff880000000000 00000008f447e23f ffffffff8252d500 [ 1.245193] Call Trace: [ 1.245193] [<ffffffff814f6f49>] dump_stack+0x4c/0x65 [ 1.245193] [<ffffffff810b56c5>] ? console_unlock+0x1c5/0x510 [ 1.245193] [<ffffffff810a150d>] __lock_acquire+0x1a6d/0x1ea0 [ 1.245193] [<ffffffff8109fa78>] ? __lock_is_held+0x58/0x80 [ 1.245193] [<ffffffff810a1a93>] lock_acquire+0xd3/0x270 [ 1.245193] [<ffffffff812b3f69>] ? ubifs_init_security+0x29/0xb0 [ 1.245193] [<ffffffff814fc83b>] mutex_lock_nested+0x6b/0x3a0 [ 1.245193] [<ffffffff812b3f69>] ? ubifs_init_security+0x29/0xb0 [ 1.245193] [<ffffffff812b3f69>] ? ubifs_init_security+0x29/0xb0 [ 1.245193] [<ffffffff812b3f69>] ubifs_init_security+0x29/0xb0 [ 1.245193] [<ffffffff8128e286>] ubifs_create+0xa6/0x1f0 [ 1.245193] [<ffffffff81198e7f>] ? path_openat+0x3af/0x1280 [ 1.245193] [<ffffffff81195d15>] vfs_create+0x95/0xc0 [ 1.245193] [<ffffffff8119929c>] path_openat+0x7cc/0x1280 [ 1.245193] [<ffffffff8109ffe3>] ? __lock_acquire+0x543/0x1ea0 [ 1.245193] [<ffffffff81088f20>] ? sched_clock_cpu+0x90/0xc0 [ 1.245193] [<ffffffff81088c00>] ? calc_global_load_tick+0x60/0x90 [ 1.245193] [<ffffffff81088f20>] ? sched_clock_cpu+0x90/0xc0 [ 1.245193] [<ffffffff811a9cef>] ? __alloc_fd+0xaf/0x180 [ 1.245193] [<ffffffff8119ac55>] do_filp_open+0x75/0xd0 [ 1.245193] [<ffffffff814ffd86>] ? _raw_spin_unlock+0x26/0x40 [ 1.245193] [<ffffffff811a9cef>] ? __alloc_fd+0xaf/0x180 [ 1.245193] [<ffffffff81189bd9>] do_sys_open+0x129/0x200 [ 1.245193] [<ffffffff81189cc9>] SyS_open+0x19/0x20 [ 1.245193] [<ffffffff81500717>] entry_SYSCALL_64_fastpath+0x12/0x6f While the lockdep splat is a false positive, becuase path_openat holds i_mutex of the parent directory and ubifs_init_security() tries to acquire i_mutex of a new inode, it reveals that taking i_mutex in ubifs_init_security() is in vain because it is only being called in the inode allocation path and therefore nobody else can see the inode yet. Reported-and-tested-by: Boris Brezillon <[email protected]> Reviewed-and-tested-by: Dongsheng Yang <[email protected]> Signed-off-by: Richard Weinberger <[email protected]> Signed-off-by: [email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit ee556d0 upstream. When function graph tracer is enabled, the following operation will trigger panic: mount -t debugfs nodev /sys/kernel echo next_tgid > /sys/kernel/tracing/set_ftrace_filter echo function_graph > /sys/kernel/tracing/current_tracer ls /proc/ ------------[ cut here ]------------ [ 198.501417] Unable to handle kernel paging request at virtual address cb88537fdc8ba316 [ 198.506126] pgd = ffffffc008f79000 [ 198.509363] [cb88537fdc8ba316] *pgd=00000000488c6003, *pud=00000000488c6003, *pmd=0000000000000000 [ 198.517726] Internal error: Oops: 94000005 [#1] SMP [ 198.518798] Modules linked in: [ 198.520582] CPU: 1 PID: 1388 Comm: ls Tainted: G [ 198.521800] Hardware name: linux,dummy-virt (DT) [ 198.522852] task: ffffffc0fa9e8000 ti: ffffffc0f9ab0000 task.ti: ffffffc0f9ab0000 [ 198.524306] PC is at next_tgid+0x30/0x100 [ 198.525205] LR is at return_to_handler+0x0/0x20 [ 198.526090] pc : [<ffffffc0002a1070>] lr : [<ffffffc0000907c0>] pstate: 60000145 [ 198.527392] sp : ffffffc0f9ab3d40 [ 198.528084] x29: ffffffc0f9ab3d40 x28: ffffffc0f9ab0000 [ 198.529406] x27: ffffffc000d6a000 x26: ffffffc000b786e8 [ 198.530659] x25: ffffffc0002a1900 x24: ffffffc0faf16c00 [ 198.531942] x23: ffffffc0f9ab3ea0 x22: 0000000000000002 [ 198.533202] x21: ffffffc000d85050 x20: 0000000000000002 [ 198.534446] x19: 0000000000000002 x18: 0000000000000000 [ 198.535719] x17: 000000000049fa08 x16: ffffffc000242efc [ 198.537030] x15: 0000007fa472b54c x14: ffffffffff000000 [ 198.538347] x13: ffffffc0fada84a0 x12: 0000000000000001 [ 198.539634] x11: ffffffc0f9ab3d70 x10: ffffffc0f9ab3d70 [ 198.540915] x9 : ffffffc0000907c0 x8 : ffffffc0f9ab3d40 [ 198.542215] x7 : 0000002e330f08f0 x6 : 0000000000000015 [ 198.543508] x5 : 0000000000000f08 x4 : ffffffc0f9835ec0 [ 198.544792] x3 : cb88537fdc8ba316 x2 : cb88537fdc8ba306 [ 198.546108] x1 : 0000000000000002 x0 : ffffffc000d85050 [ 198.547432] [ 198.547920] Process ls (pid: 1388, stack limit = 0xffffffc0f9ab0020) [ 198.549170] Stack: (0xffffffc0f9ab3d40 to 0xffffffc0f9ab4000) [ 198.582568] Call trace: [ 198.583313] [<ffffffc0002a1070>] next_tgid+0x30/0x100 [ 198.584359] [<ffffffc0000907bc>] ftrace_graph_caller+0x6c/0x70 [ 198.585503] [<ffffffc0000907bc>] ftrace_graph_caller+0x6c/0x70 [ 198.586574] [<ffffffc0000907bc>] ftrace_graph_caller+0x6c/0x70 [ 198.587660] [<ffffffc0000907bc>] ftrace_graph_caller+0x6c/0x70 [ 198.588896] Code: aa0003f5 2a0103f4 b4000102 91004043 (885f7c60) [ 198.591092] ---[ end trace 6a346f8f20949ac8 ]--- This is because when using function graph tracer, if the traced function return value is in multi regs ([x0-x7]), return_to_handler may corrupt them. So in return_to_handler, the parameter regs should be protected properly. Signed-off-by: Li Bin <[email protected]> Acked-by: AKASHI Takahiro <[email protected]> Signed-off-by: Catalin Marinas <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 3ec0c97 upstream. If filelayout_decode_layout fail, _filelayout_free_lseg will causes a double freeing of fh_array. [ 1179.279800] BUG: unable to handle kernel NULL pointer dereference at (null) [ 1179.280198] IP: [<ffffffffa027222d>] filelayout_free_fh_array.isra.11+0x1d/0x70 [nfs_layout_nfsv41_files] [ 1179.281010] PGD 0 [ 1179.281443] Oops: 0000 [#1] [ 1179.281831] Modules linked in: nfs_layout_nfsv41_files(OE) nfsv4(OE) nfs(OE) fscache(E) xfs libcrc32c coretemp nfsd crct10dif_pclmul ppdev crc32_pclmul crc32c_intel auth_rpcgss ghash_clmulni_intel nfs_acl lockd vmw_balloon grace sunrpc parport_pc vmw_vmci parport shpchp i2c_piix4 vmwgfx drm_kms_helper ttm drm serio_raw mptspi scsi_transport_spi mptscsih e1000 mptbase ata_generic pata_acpi [last unloaded: fscache] [ 1179.283891] CPU: 0 PID: 13336 Comm: cat Tainted: G OE 4.3.0-rc1-pnfs+ #244 [ 1179.284323] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/20/2014 [ 1179.285206] task: ffff8800501d48c0 ti: ffff88003e3c4000 task.ti: ffff88003e3c4000 [ 1179.285668] RIP: 0010:[<ffffffffa027222d>] [<ffffffffa027222d>] filelayout_free_fh_array.isra.11+0x1d/0x70 [nfs_layout_nfsv41_files] [ 1179.286612] RSP: 0018:ffff88003e3c77f8 EFLAGS: 00010202 [ 1179.287092] RAX: 0000000000000000 RBX: ffff88001fe78900 RCX: 0000000000000000 [ 1179.287731] RDX: ffffea0000f40760 RSI: ffff88001fe789c8 RDI: ffff88001fe789c0 [ 1179.288383] RBP: ffff88003e3c7810 R08: ffffea0000f40760 R09: 0000000000000000 [ 1179.289170] R10: 0000000000000000 R11: 0000000000000001 R12: ffff88001fe789c8 [ 1179.289959] R13: ffff88001fe789c0 R14: ffff88004ec05a80 R15: ffff88004f935b88 [ 1179.290791] FS: 00007f4e66bb5700(0000) GS:ffffffff81c29000(0000) knlGS:0000000000000000 [ 1179.291580] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1179.292209] CR2: 0000000000000000 CR3: 00000000203f8000 CR4: 00000000001406f0 [ 1179.292731] Stack: [ 1179.293195] ffff88001fe78900 00000000000000d0 ffff88001fe78178 ffff88003e3c7868 [ 1179.293676] ffffffffa0272737 0000000000000001 0000000000000001 ffff88001fe78800 [ 1179.294151] 00000000614fffce ffffffff81727671 ffff88001fe78100 ffff88001fe78100 [ 1179.294623] Call Trace: [ 1179.295092] [<ffffffffa0272737>] filelayout_alloc_lseg+0xa7/0x2d0 [nfs_layout_nfsv41_files] [ 1179.295625] [<ffffffff81727671>] ? out_of_line_wait_on_bit+0x81/0xb0 [ 1179.296133] [<ffffffffa040407e>] pnfs_layout_process+0xae/0x320 [nfsv4] [ 1179.296632] [<ffffffffa03e0a01>] nfs4_proc_layoutget+0x2b1/0x360 [nfsv4] [ 1179.297134] [<ffffffffa0402983>] pnfs_update_layout+0x853/0xb30 [nfsv4] [ 1179.297632] [<ffffffffa039db24>] ? nfs_get_lock_context+0x74/0x170 [nfs] [ 1179.298158] [<ffffffffa0271807>] filelayout_pg_init_read+0x37/0x50 [nfs_layout_nfsv41_files] [ 1179.298834] [<ffffffffa03a72d9>] __nfs_pageio_add_request+0x119/0x460 [nfs] [ 1179.299385] [<ffffffffa03a6bd7>] ? nfs_create_request.part.9+0x37/0x2e0 [nfs] [ 1179.299872] [<ffffffffa03a7cc3>] nfs_pageio_add_request+0xa3/0x1b0 [nfs] [ 1179.300362] [<ffffffffa03a8635>] readpage_async_filler+0x85/0x260 [nfs] [ 1179.300907] [<ffffffff81180cb1>] read_cache_pages+0x91/0xd0 [ 1179.301391] [<ffffffffa03a85b0>] ? nfs_read_completion+0x220/0x220 [nfs] [ 1179.301867] [<ffffffffa03a8dc8>] nfs_readpages+0x128/0x200 [nfs] [ 1179.302330] [<ffffffff81180ef3>] __do_page_cache_readahead+0x203/0x280 [ 1179.302784] [<ffffffff81180dc8>] ? __do_page_cache_readahead+0xd8/0x280 [ 1179.303413] [<ffffffff81181116>] ondemand_readahead+0x1a6/0x2f0 [ 1179.303855] [<ffffffff81181371>] page_cache_sync_readahead+0x31/0x50 [ 1179.304286] [<ffffffff811750a6>] generic_file_read_iter+0x4a6/0x5c0 [ 1179.304711] [<ffffffffa03a0316>] ? __nfs_revalidate_mapping+0x1f6/0x240 [nfs] [ 1179.305132] [<ffffffffa039ccf2>] nfs_file_read+0x52/0xa0 [nfs] [ 1179.305540] [<ffffffff811e343c>] __vfs_read+0xcc/0x100 [ 1179.305936] [<ffffffff811e3d15>] vfs_read+0x85/0x130 [ 1179.306326] [<ffffffff811e4a98>] SyS_read+0x58/0xd0 [ 1179.306708] [<ffffffff8172caaf>] entry_SYSCALL_64_fastpath+0x12/0x76 [ 1179.307094] Code: c4 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 8b 07 49 89 f4 85 c0 74 47 48 8b 06 49 89 fd <48> 8b 38 48 85 ff 74 22 31 db eb 0c 48 63 d3 48 8b 3c d0 48 85 [ 1179.308357] RIP [<ffffffffa027222d>] filelayout_free_fh_array.isra.11+0x1d/0x70 [nfs_layout_nfsv41_files] [ 1179.309177] RSP <ffff88003e3c77f8> [ 1179.309582] CR2: 0000000000000000 Signed-off-by: Kinglong Mee <[email protected]> Signed-off-by: Trond Myklebust <[email protected]> Cc: William Dauchy <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit e81107d upstream. My colleague ran into a program stall on a x86_64 server, where n_tty_read() was waiting for data even if there was data in the buffer in the pty. kernel stack for the stuck process looks like below. #0 [ffff88303d107b58] __schedule at ffffffff815c4b20 #1 [ffff88303d107bd0] schedule at ffffffff815c513e #2 [ffff88303d107bf0] schedule_timeout at ffffffff815c7818 #3 [ffff88303d107ca0] wait_woken at ffffffff81096bd2 #4 [ffff88303d107ce0] n_tty_read at ffffffff8136fa23 #5 [ffff88303d107dd0] tty_read at ffffffff81368013 #6 [ffff88303d107e20] __vfs_read at ffffffff811a3704 #7 [ffff88303d107ec0] vfs_read at ffffffff811a3a57 #8 [ffff88303d107f00] sys_read at ffffffff811a4306 #9 [ffff88303d107f50] entry_SYSCALL_64_fastpath at ffffffff815c86d7 There seems to be two problems causing this issue. First, in drivers/tty/n_tty.c, __receive_buf() stores the data and updates ldata->commit_head using smp_store_release() and then checks the wait queue using waitqueue_active(). However, since there is no memory barrier, __receive_buf() could return without calling wake_up_interactive_poll(), and at the same time, n_tty_read() could start to wait in wait_woken() as in the following chart. __receive_buf() n_tty_read() ------------------------------------------------------------------------ if (waitqueue_active(&tty->read_wait)) /* Memory operations issued after the RELEASE may be completed before the RELEASE operation has completed */ add_wait_queue(&tty->read_wait, &wait); ... if (!input_available_p(tty, 0)) { smp_store_release(&ldata->commit_head, ldata->read_head); ... timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); ------------------------------------------------------------------------ The second problem is that n_tty_read() also lacks a memory barrier call and could also cause __receive_buf() to return without calling wake_up_interactive_poll(), and n_tty_read() to wait in wait_woken() as in the chart below. __receive_buf() n_tty_read() ------------------------------------------------------------------------ spin_lock_irqsave(&q->lock, flags); /* from add_wait_queue() */ ... if (!input_available_p(tty, 0)) { /* Memory operations issued after the RELEASE may be completed before the RELEASE operation has completed */ smp_store_release(&ldata->commit_head, ldata->read_head); if (waitqueue_active(&tty->read_wait)) __add_wait_queue(q, wait); spin_unlock_irqrestore(&q->lock,flags); /* from add_wait_queue() */ ... timeout = wait_woken(&wait, TASK_INTERRUPTIBLE, timeout); ------------------------------------------------------------------------ There are also other places in drivers/tty/n_tty.c which have similar calls to waitqueue_active(), so instead of adding many memory barrier calls, this patch simply removes the call to waitqueue_active(), leaving just wake_up*() behind. This fixes both problems because, even though the memory access before or after the spinlocks in both wake_up*() and add_wait_queue() can sneak into the critical section, it cannot go past it and the critical section assures that they will be serialized (please see "INTER-CPU ACQUIRING BARRIER EFFECTS" in Documentation/memory-barriers.txt for a better explanation). Moreover, the resulting code is much simpler. Latency measurement using a ping-pong test over a pty doesn't show any visible performance drop. Signed-off-by: Kosuke Tatsukawa <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 7180ddd upstream. The kernel may delay interrupts for a long time which can result in timers being delayed. If this occurs the intel_pstate driver will crash with a divide by zero error: divide error: 0000 [#1] SMP Modules linked in: btrfs zlib_deflate raid6_pq xor msdos ext4 mbcache jbd2 binfmt_misc arc4 md4 nls_utf8 cifs dns_resolver tcp_lp bnep bluetooth rfkill fuse dm_service_time iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ftp ip6t_rpfilter ip6t_REJECT ipt_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw iptable_filter ip_tables intel_powerclamp coretemp vfat fat kvm_intel iTCO_wdt iTCO_vendor_support ipmi_devintf sr_mod kvm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel cdc_ether lrw usbnet cdrom mii gf128mul glue_helper ablk_helper cryptd lpc_ich mfd_core pcspkr sb_edac edac_core ipmi_si ipmi_msghandler ioatdma wmi shpchp acpi_pad nfsd auth_rpcgss nfs_acl lockd uinput dm_multipath sunrpc xfs libcrc32c usb_storage sd_mod crc_t10dif crct10dif_common ixgbe mgag200 syscopyarea sysfillrect sysimgblt mdio drm_kms_helper ttm igb drm ptp pps_core dca i2c_algo_bit megaraid_sas i2c_core dm_mirror dm_region_hash dm_log dm_mod CPU: 113 PID: 0 Comm: swapper/113 Tainted: G W -------------- 3.10.0-229.1.2.el7.x86_64 #1 Hardware name: IBM x3950 X6 -[3837AC2]-/00FN827, BIOS -[A8E112BUS-1.00]- 08/27/2014 task: ffff880fe8abe660 ti: ffff880fe8ae4000 task.ti: ffff880fe8ae4000 RIP: 0010:[<ffffffff814a9279>] [<ffffffff814a9279>] intel_pstate_timer_func+0x179/0x3d0 RSP: 0018:ffff883fff4e3db8 EFLAGS: 00010206 RAX: 0000000027100000 RBX: ffff883fe6965100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000010 RDI: 000000002e53632d RBP: ffff883fff4e3e20 R08: 000e6f69a5a125c0 R09: ffff883fe84ec001 R10: 0000000000000002 R11: 0000000000000005 R12: 00000000000049f5 R13: 0000000000271000 R14: 00000000000049f5 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff883fff4e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7668601000 CR3: 000000000190a000 CR4: 00000000001407e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Stack: ffff883fff4e3e58 ffffffff81099dc1 0000000000000086 0000000000000071 ffff883fff4f3680 0000000000000071 fbdc8a965e33afee ffffffff810b69dd ffff883fe84ec000 ffff883fe6965108 0000000000000100 ffffffff814a9100 Call Trace: <IRQ> [<ffffffff81099dc1>] ? run_posix_cpu_timers+0x51/0x840 [<ffffffff810b69dd>] ? trigger_load_balance+0x5d/0x200 [<ffffffff814a9100>] ? pid_param_set+0x130/0x130 [<ffffffff8107df56>] call_timer_fn+0x36/0x110 [<ffffffff814a9100>] ? pid_param_set+0x130/0x130 [<ffffffff8107fdcf>] run_timer_softirq+0x21f/0x320 [<ffffffff81077b2f>] __do_softirq+0xef/0x280 [<ffffffff816156dc>] call_softirq+0x1c/0x30 [<ffffffff81015d95>] do_softirq+0x65/0xa0 [<ffffffff81077ec5>] irq_exit+0x115/0x120 [<ffffffff81616355>] smp_apic_timer_interrupt+0x45/0x60 [<ffffffff81614a1d>] apic_timer_interrupt+0x6d/0x80 <EOI> [<ffffffff814a9c32>] ? cpuidle_enter_state+0x52/0xc0 [<ffffffff814a9c28>] ? cpuidle_enter_state+0x48/0xc0 [<ffffffff814a9d65>] cpuidle_idle_call+0xc5/0x200 [<ffffffff8101d14e>] arch_cpu_idle+0xe/0x30 [<ffffffff810c67c1>] cpu_startup_entry+0xf1/0x290 [<ffffffff8104228a>] start_secondary+0x1ba/0x230 Code: 42 0f 00 45 89 e6 48 01 c2 43 8d 44 6d 00 39 d0 73 26 49 c1 e5 08 89 d2 4d 63 f4 49 63 c5 48 c1 e2 08 48 c1 e0 08 48 63 ca 48 99 <48> f7 f9 48 98 4c 0f af f0 49 c1 ee 08 8b 43 78 c1 e0 08 44 29 RIP [<ffffffff814a9279>] intel_pstate_timer_func+0x179/0x3d0 RSP <ffff883fff4e3db8> The kernel values for cpudata for CPU 113 were: struct cpudata { cpu = 113, timer = { entry = { next = 0x0, prev = 0xdead000000200200 }, expires = 8357799745, base = 0xffff883fe84ec001, function = 0xffffffff814a9100 <intel_pstate_timer_func>, data = 18446612406765768960, <snip> i_gain = 0, d_gain = 0, deadband = 0, last_err = 22489 }, last_sample_time = { tv64 = 4063132438017305 }, prev_aperf = 287326796397463, prev_mperf = 251427432090198, sample = { core_pct_busy = 23081, aperf = 2937407, mperf = 3257884, freq = 2524484, time = { tv64 = 4063149215234118 } } } which results in the time between samples = last_sample_time - sample.time = 4063149215234118 - 4063132438017305 = 16777216813 which is 16.777 seconds. The duration between reads of the APERF and MPERF registers overflowed a s32 sized integer in intel_pstate_get_scaled_busy()'s call to div_fp(). The result is that int_tofp(duration_us) == 0, and the kernel attempts to divide by 0. While the kernel shouldn't be delaying for a long time, it can and does happen and the intel_pstate driver should not panic in this situation. This patch changes the div_fp() function to use div64_s64() to allow for "long" division. This will avoid the overflow condition on long delays. [v2]: use div64_s64() in div_fp() Signed-off-by: Prarit Bhargava <[email protected]> Signed-off-by: Rafael J. Wysocki <[email protected]> Cc: Thomas Renninger <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

[ Upstream commit e674016 ] Since commit 2b018d5 ("pppoe: drop PPPOX_ZOMBIEs in pppoe_release"), pppoe_release() calls dev_put(po->pppoe_dev) if sk is in the PPPOX_ZOMBIE state. But pppoe_flush_dev() can set sk->sk_state to PPPOX_ZOMBIE _and_ reset po->pppoe_dev to NULL. This leads to the following oops: [ 570.140800] BUG: unable to handle kernel NULL pointer dereference at 00000000000004e0 [ 570.142931] IP: [<ffffffffa018c701>] pppoe_release+0x50/0x101 [pppoe] [ 570.144601] PGD 3d119067 PUD 3dbc1067 PMD 0 [ 570.144601] Oops: 0000 [#1] SMP [ 570.144601] Modules linked in: l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel pppoe pppox ppp_generic slhc loop crc32c_intel ghash_clmulni_intel jitterentropy_rng sha256_generic hmac drbg ansi_cprng aesni_intel aes_x86_64 ablk_helper cryptd lrw gf128mul glue_helper acpi_cpufreq evdev serio_raw processor button ext4 crc16 mbcache jbd2 virtio_net virtio_blk virtio_pci virtio_ring virtio [ 570.144601] CPU: 1 PID: 15738 Comm: ppp-apitest Not tainted 4.2.0 #1 [ 570.144601] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 570.144601] task: ffff88003d30d600 ti: ffff880036b60000 task.ti: ffff880036b60000 [ 570.144601] RIP: 0010:[<ffffffffa018c701>] [<ffffffffa018c701>] pppoe_release+0x50/0x101 [pppoe] [ 570.144601] RSP: 0018:ffff880036b63e08 EFLAGS: 00010202 [ 570.144601] RAX: 0000000000000000 RBX: ffff880034340000 RCX: 0000000000000206 [ 570.144601] RDX: 0000000000000006 RSI: ffff88003d30dd20 RDI: ffff88003d30dd20 [ 570.144601] RBP: ffff880036b63e28 R08: 0000000000000001 R09: 0000000000000000 [ 570.144601] R10: 00007ffee9b50420 R11: ffff880034340078 R12: ffff8800387ec780 [ 570.144601] R13: ffff8800387ec7b0 R14: ffff88003e222aa0 R15: ffff8800387ec7b0 [ 570.144601] FS: 00007f5672f48700(0000) GS:ffff88003fc80000(0000) knlGS:0000000000000000 [ 570.144601] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 570.144601] CR2: 00000000000004e0 CR3: 0000000037f7e000 CR4: 00000000000406a0 [ 570.144601] Stack: [ 570.144601] ffffffffa018f240 ffff8800387ec780 ffffffffa018f240 ffff8800387ec7b0 [ 570.144601] ffff880036b63e48 ffffffff812caabe ffff880039e4e000 0000000000000008 [ 570.144601] ffff880036b63e58 ffffffff812cabad ffff880036b63ea8 ffffffff811347f5 [ 570.144601] Call Trace: [ 570.144601] [<ffffffff812caabe>] sock_release+0x1a/0x75 [ 570.144601] [<ffffffff812cabad>] sock_close+0xd/0x11 [ 570.144601] [<ffffffff811347f5>] __fput+0xff/0x1a5 [ 570.144601] [<ffffffff811348cb>] ____fput+0x9/0xb [ 570.144601] [<ffffffff81056682>] task_work_run+0x66/0x90 [ 570.144601] [<ffffffff8100189e>] prepare_exit_to_usermode+0x8c/0xa7 [ 570.144601] [<ffffffff81001a26>] syscall_return_slowpath+0x16d/0x19b [ 570.144601] [<ffffffff813babb1>] int_ret_from_sys_call+0x25/0x9f [ 570.144601] Code: 48 8b 83 c8 01 00 00 a8 01 74 12 48 89 df e8 8b 27 14 e1 b8 f7 ff ff ff e9 b7 00 00 00 8a 43 12 a8 0b 74 1c 48 8b 83 a8 04 00 00 <48> 8b 80 e0 04 00 00 65 ff 08 48 c7 83 a8 04 00 00 00 00 00 00 [ 570.144601] RIP [<ffffffffa018c701>] pppoe_release+0x50/0x101 [pppoe] [ 570.144601] RSP <ffff880036b63e08> [ 570.144601] CR2: 00000000000004e0 [ 570.200518] ---[ end trace 46956baf17349563 ]--- pppoe_flush_dev() has no reason to override sk->sk_state with PPPOX_ZOMBIE. pppox_unbind_sock() already sets sk->sk_state to PPPOX_DEAD, which is the correct state given that sk is unbound and po->pppoe_dev is NULL. Fixes: 2b018d5 ("pppoe: drop PPPOX_ZOMBIEs in pppoe_release") Tested-by: Oleksii Berezhniak <[email protected]> Signed-off-by: Guillaume Nault <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

[ Upstream commit 93d08b6 ] When sockets have a native eBPF program attached through setsockopt(sk, SOL_SOCKET, SO_ATTACH_BPF, ...), and then try to dump these over getsockopt(sk, SOL_SOCKET, SO_GET_FILTER, ...), the following panic appears: [49904.178642] BUG: unable to handle kernel NULL pointer dereference at (null) [49904.178762] IP: [<ffffffff81610fd9>] sk_get_filter+0x39/0x90 [49904.182000] PGD 86fc9067 PUD 531a1067 PMD 0 [49904.185196] Oops: 0000 [#1] SMP [...] [49904.224677] Call Trace: [49904.226090] [<ffffffff815e3d49>] sock_getsockopt+0x319/0x740 [49904.227535] [<ffffffff812f59e3>] ? sock_has_perm+0x63/0x70 [49904.228953] [<ffffffff815e2fc8>] ? release_sock+0x108/0x150 [49904.230380] [<ffffffff812f5a43>] ? selinux_socket_getsockopt+0x23/0x30 [49904.231788] [<ffffffff815dff36>] SyS_getsockopt+0xa6/0xc0 [49904.233267] [<ffffffff8171b9ae>] entry_SYSCALL_64_fastpath+0x12/0x71 The underlying issue is the very same as in commit b382c08 ("sock, diag: fix panic in sock_diag_put_filterinfo"), that is, native eBPF programs don't store an original program since this is only needed in cBPF ones. However, sk_get_filter() wasn't updated to test for this at the time when eBPF could be attached. Just throw an error to the user to indicate that eBPF cannot be dumped over this interface. That way, it can also be known that a program _is_ attached (as opposed to just return 0), and a different (future) method needs to be consulted for a dump. Fixes: 89aa075 ("net: sock: allow eBPF programs to be attached to sockets") Signed-off-by: Daniel Borkmann <[email protected]> Acked-by: Alexei Starovoitov <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 874bbfe upstream. My system keeps crashing with below message. vmstat_update() schedules a delayed work in current cpu and expects the work runs in the cpu. schedule_delayed_work() is expected to make delayed work run in local cpu. The problem is timer can be migrated with NO_HZ. __queue_work() queues work in timer handler, which could run in a different cpu other than where the delayed work is scheduled. The end result is the delayed work runs in different cpu. The patch makes __queue_delayed_work records local cpu earlier. Where the timer runs doesn't change where the work runs with the change. [ 28.010131] ------------[ cut here ]------------ [ 28.010609] kernel BUG at ../mm/vmstat.c:1392! [ 28.011099] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN [ 28.011860] Modules linked in: [ 28.012245] CPU: 0 PID: 289 Comm: kworker/0:3 Tainted: G W4.3.0-rc3+ #634 [ 28.013065] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140709_153802- 04/01/2014 [ 28.014160] Workqueue: events vmstat_update [ 28.014571] task: ffff880117682580 ti: ffff8800ba428000 task.ti: ffff8800ba428000 [ 28.015445] RIP: 0010:[<ffffffff8115f921>] [<ffffffff8115f921>]vmstat_update+0x31/0x80 [ 28.016282] RSP: 0018:ffff8800ba42fd80 EFLAGS: 00010297 [ 28.016812] RAX: 0000000000000000 RBX: ffff88011a858dc0 RCX:0000000000000000 [ 28.017585] RDX: ffff880117682580 RSI: ffffffff81f14d8c RDI:ffffffff81f4df8d [ 28.018366] RBP: ffff8800ba42fd90 R08: 0000000000000001 R09:0000000000000000 [ 28.019169] R10: 0000000000000000 R11: 0000000000000121 R12:ffff8800baa9f640 [ 28.019947] R13: ffff88011a81e340 R14: ffff88011a823700 R15:0000000000000000 [ 28.020071] FS: 0000000000000000(0000) GS:ffff88011a800000(0000)knlGS:0000000000000000 [ 28.020071] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 28.020071] CR2: 00007ff6144b01d0 CR3: 00000000b8e93000 CR4:00000000000006f0 [ 28.020071] Stack: [ 28.020071] ffff88011a858dc0 ffff8800baa9f640 ffff8800ba42fe00ffffffff8106bd88 [ 28.020071] ffffffff8106bd0b 0000000000000096 0000000000000000ffffffff82f9b1e8 [ 28.020071] ffffffff829f0b10 0000000000000000 ffffffff81f18460ffff88011a81e340 [ 28.020071] Call Trace: [ 28.020071] [<ffffffff8106bd88>] process_one_work+0x1c8/0x540 [ 28.020071] [<ffffffff8106bd0b>] ? process_one_work+0x14b/0x540 [ 28.020071] [<ffffffff8106c214>] worker_thread+0x114/0x460 [ 28.020071] [<ffffffff8106c100>] ? process_one_work+0x540/0x540 [ 28.020071] [<ffffffff81071bf8>] kthread+0xf8/0x110 [ 28.020071] [<ffffffff81071b00>] ?kthread_create_on_node+0x200/0x200 [ 28.020071] [<ffffffff81a6522f>] ret_from_fork+0x3f/0x70 [ 28.020071] [<ffffffff81071b00>] ?kthread_create_on_node+0x200/0x200 Signed-off-by: Shaohua Li <[email protected]> Signed-off-by: Tejun Heo <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

…fy a fault commit 2f84a89 upstream. SunDong reported the following on https://bugzilla.kernel.org/show_bug.cgi?id=103841 I think I find a linux bug, I have the test cases is constructed. I can stable recurring problems in fedora22(4.0.4) kernel version, arch for x86_64. I construct transparent huge page, when the parent and child process with MAP_SHARE, MAP_PRIVATE way to access the same huge page area, it has the opportunity to lead to huge page copy on write failure, and then it will munmap the child corresponding mmap area, but then the child mmap area with VM_MAYSHARE attributes, child process munmap this area can trigger VM_BUG_ON in set_vma_resv_flags functions (vma - > vm_flags & VM_MAYSHARE). There were a number of problems with the report (e.g. it's hugetlbfs that triggers this, not transparent huge pages) but it was fundamentally correct in that a VM_BUG_ON in set_vma_resv_flags() can be triggered that looks like this vma ffff8804651fd0d0 start 00007fc474e00000 end 00007fc475e00000 next ffff8804651fd018 prev ffff8804651fd188 mm ffff88046b1b1800 prot 8000000000000027 anon_vma (null) vm_ops ffffffff8182a7a0 pgoff 0 file ffff88106bdb9800 private_data (null) flags: 0x84400fb(read|write|shared|mayread|maywrite|mayexec|mayshare|dontexpand|hugetlb) ------------ kernel BUG at mm/hugetlb.c:462! SMP Modules linked in: xt_pkttype xt_LOG xt_limit [..] CPU: 38 PID: 26839 Comm: map Not tainted 4.0.4-default #1 Hardware name: Dell Inc. PowerEdge R810/0TT6JF, BIOS 2.7.4 04/26/2012 set_vma_resv_flags+0x2d/0x30 The VM_BUG_ON is correct because private and shared mappings have different reservation accounting but the warning clearly shows that the VMA is shared. When a private COW fails to allocate a new page then only the process that created the VMA gets the page -- all the children unmap the page. If the children access that data in the future then they get killed. The problem is that the same file is mapped shared and private. During the COW, the allocation fails, the VMAs are traversed to unmap the other private pages but a shared VMA is found and the bug is triggered. This patch identifies such VMAs and skips them. Signed-off-by: Mel Gorman <[email protected]> Reported-by: SunDong <[email protected]> Reviewed-by: Michal Hocko <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: David Rientjes <[email protected]> Reviewed-by: Naoya Horiguchi <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

[ Upstream commit e674016 ] Since commit 2b018d5 ("pppoe: drop PPPOX_ZOMBIEs in pppoe_release"), pppoe_release() calls dev_put(po->pppoe_dev) if sk is in the PPPOX_ZOMBIE state. But pppoe_flush_dev() can set sk->sk_state to PPPOX_ZOMBIE _and_ reset po->pppoe_dev to NULL. This leads to the following oops: [ 570.140800] BUG: unable to handle kernel NULL pointer dereference at 00000000000004e0 [ 570.142931] IP: [<ffffffffa018c701>] pppoe_release+0x50/0x101 [pppoe] [ 570.144601] PGD 3d119067 PUD 3dbc1067 PMD 0 [ 570.144601] Oops: 0000 [#1] SMP [ 570.144601] Modules linked in: l2tp_ppp l2tp_netlink l2tp_core ip6_udp_tunnel udp_tunnel pppoe pppox ppp_generic slhc loop crc32c_intel ghash_clmulni_intel jitterentropy_rng sha256_generic hmac drbg ansi_cprng aesni_intel aes_x86_64 ablk_helper cryptd lrw gf128mul glue_helper acpi_cpufreq evdev serio_raw processor button ext4 crc16 mbcache jbd2 virtio_net virtio_blk virtio_pci virtio_ring virtio [ 570.144601] CPU: 1 PID: 15738 Comm: ppp-apitest Not tainted 4.2.0 #1 [ 570.144601] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014 [ 570.144601] task: ffff88003d30d600 ti: ffff880036b60000 task.ti: ffff880036b60000 [ 570.144601] RIP: 0010:[<ffffffffa018c701>] [<ffffffffa018c701>] pppoe_release+0x50/0x101 [pppoe] [ 570.144601] RSP: 0018:ffff880036b63e08 EFLAGS: 00010202 [ 570.144601] RAX: 0000000000000000 RBX: ffff880034340000 RCX: 0000000000000206 [ 570.144601] RDX: 0000000000000006 RSI: ffff88003d30dd20 RDI: ffff88003d30dd20 [ 570.144601] RBP: ffff880036b63e28 R08: 0000000000000001 R09: 0000000000000000 [ 570.144601] R10: 00007ffee9b50420 R11: ffff880034340078 R12: ffff8800387ec780 [ 570.144601] R13: ffff8800387ec7b0 R14: ffff88003e222aa0 R15: ffff8800387ec7b0 [ 570.144601] FS: 00007f5672f48700(0000) GS:ffff88003fc80000(0000) knlGS:0000000000000000 [ 570.144601] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 570.144601] CR2: 00000000000004e0 CR3: 0000000037f7e000 CR4: 00000000000406a0 [ 570.144601] Stack: [ 570.144601] ffffffffa018f240 ffff8800387ec780 ffffffffa018f240 ffff8800387ec7b0 [ 570.144601] ffff880036b63e48 ffffffff812caabe ffff880039e4e000 0000000000000008 [ 570.144601] ffff880036b63e58 ffffffff812cabad ffff880036b63ea8 ffffffff811347f5 [ 570.144601] Call Trace: [ 570.144601] [<ffffffff812caabe>] sock_release+0x1a/0x75 [ 570.144601] [<ffffffff812cabad>] sock_close+0xd/0x11 [ 570.144601] [<ffffffff811347f5>] __fput+0xff/0x1a5 [ 570.144601] [<ffffffff811348cb>] ____fput+0x9/0xb [ 570.144601] [<ffffffff81056682>] task_work_run+0x66/0x90 [ 570.144601] [<ffffffff8100189e>] prepare_exit_to_usermode+0x8c/0xa7 [ 570.144601] [<ffffffff81001a26>] syscall_return_slowpath+0x16d/0x19b [ 570.144601] [<ffffffff813babb1>] int_ret_from_sys_call+0x25/0x9f [ 570.144601] Code: 48 8b 83 c8 01 00 00 a8 01 74 12 48 89 df e8 8b 27 14 e1 b8 f7 ff ff ff e9 b7 00 00 00 8a 43 12 a8 0b 74 1c 48 8b 83 a8 04 00 00 <48> 8b 80 e0 04 00 00 65 ff 08 48 c7 83 a8 04 00 00 00 00 00 00 [ 570.144601] RIP [<ffffffffa018c701>] pppoe_release+0x50/0x101 [pppoe] [ 570.144601] RSP <ffff880036b63e08> [ 570.144601] CR2: 00000000000004e0 [ 570.200518] ---[ end trace 46956baf17349563 ]--- pppoe_flush_dev() has no reason to override sk->sk_state with PPPOX_ZOMBIE. pppox_unbind_sock() already sets sk->sk_state to PPPOX_DEAD, which is the correct state given that sk is unbound and po->pppoe_dev is NULL. Fixes: 2b018d5 ("pppoe: drop PPPOX_ZOMBIEs in pppoe_release") Tested-by: Oleksii Berezhniak <[email protected]> Signed-off-by: Guillaume Nault <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 874bbfe upstream. My system keeps crashing with below message. vmstat_update() schedules a delayed work in current cpu and expects the work runs in the cpu. schedule_delayed_work() is expected to make delayed work run in local cpu. The problem is timer can be migrated with NO_HZ. __queue_work() queues work in timer handler, which could run in a different cpu other than where the delayed work is scheduled. The end result is the delayed work runs in different cpu. The patch makes __queue_delayed_work records local cpu earlier. Where the timer runs doesn't change where the work runs with the change. [ 28.010131] ------------[ cut here ]------------ [ 28.010609] kernel BUG at ../mm/vmstat.c:1392! [ 28.011099] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN [ 28.011860] Modules linked in: [ 28.012245] CPU: 0 PID: 289 Comm: kworker/0:3 Tainted: G W4.3.0-rc3+ #634 [ 28.013065] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140709_153802- 04/01/2014 [ 28.014160] Workqueue: events vmstat_update [ 28.014571] task: ffff880117682580 ti: ffff8800ba428000 task.ti: ffff8800ba428000 [ 28.015445] RIP: 0010:[<ffffffff8115f921>] [<ffffffff8115f921>]vmstat_update+0x31/0x80 [ 28.016282] RSP: 0018:ffff8800ba42fd80 EFLAGS: 00010297 [ 28.016812] RAX: 0000000000000000 RBX: ffff88011a858dc0 RCX:0000000000000000 [ 28.017585] RDX: ffff880117682580 RSI: ffffffff81f14d8c RDI:ffffffff81f4df8d [ 28.018366] RBP: ffff8800ba42fd90 R08: 0000000000000001 R09:0000000000000000 [ 28.019169] R10: 0000000000000000 R11: 0000000000000121 R12:ffff8800baa9f640 [ 28.019947] R13: ffff88011a81e340 R14: ffff88011a823700 R15:0000000000000000 [ 28.020071] FS: 0000000000000000(0000) GS:ffff88011a800000(0000)knlGS:0000000000000000 [ 28.020071] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 28.020071] CR2: 00007ff6144b01d0 CR3: 00000000b8e93000 CR4:00000000000006f0 [ 28.020071] Stack: [ 28.020071] ffff88011a858dc0 ffff8800baa9f640 ffff8800ba42fe00ffffffff8106bd88 [ 28.020071] ffffffff8106bd0b 0000000000000096 0000000000000000ffffffff82f9b1e8 [ 28.020071] ffffffff829f0b10 0000000000000000 ffffffff81f18460ffff88011a81e340 [ 28.020071] Call Trace: [ 28.020071] [<ffffffff8106bd88>] process_one_work+0x1c8/0x540 [ 28.020071] [<ffffffff8106bd0b>] ? process_one_work+0x14b/0x540 [ 28.020071] [<ffffffff8106c214>] worker_thread+0x114/0x460 [ 28.020071] [<ffffffff8106c100>] ? process_one_work+0x540/0x540 [ 28.020071] [<ffffffff81071bf8>] kthread+0xf8/0x110 [ 28.020071] [<ffffffff81071b00>] ?kthread_create_on_node+0x200/0x200 [ 28.020071] [<ffffffff81a6522f>] ret_from_fork+0x3f/0x70 [ 28.020071] [<ffffffff81071b00>] ?kthread_create_on_node+0x200/0x200 Signed-off-by: Shaohua Li <[email protected]> Signed-off-by: Tejun Heo <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

otavio · 2015-11-05T17:08:20Z

Wrong tree. #2 is the new version of it.

Commit e520af4 introduced the following bug when setting the TCP_REPAIR sockoption: [ 2860.657036] BUG: using __this_cpu_add() in preemptible [00000000] code: daemon/12164 [ 2860.657045] caller is __this_cpu_preempt_check+0x13/0x20 [ 2860.657049] CPU: 1 PID: 12164 Comm: daemon Not tainted 4.2.3 #1 [ 2860.657051] Hardware name: Dell Inc. PowerEdge R210 II/0JP7TR, BIOS 2.0.5 03/13/2012 [ 2860.657054] ffffffff81c7f071 ffff880231e9fdf8 ffffffff8185d765 0000000000000002 [ 2860.657058] 0000000000000001 ffff880231e9fe28 ffffffff8146ed91 ffff880231e9fe18 [ 2860.657062] ffffffff81cd1a5d ffff88023534f200 ffff8800b9811000 ffff880231e9fe38 [ 2860.657065] Call Trace: [ 2860.657072] [<ffffffff8185d765>] dump_stack+0x4f/0x7b [ 2860.657075] [<ffffffff8146ed91>] check_preemption_disabled+0xe1/0xf0 [ 2860.657078] [<ffffffff8146edd3>] __this_cpu_preempt_check+0x13/0x20 [ 2860.657082] [<ffffffff817e0bc7>] tcp_xmit_probe_skb+0xc7/0x100 [ 2860.657085] [<ffffffff817e1e2d>] tcp_send_window_probe+0x2d/0x30 [ 2860.657089] [<ffffffff817d1d8c>] do_tcp_setsockopt.isra.29+0x74c/0x830 [ 2860.657093] [<ffffffff817d1e9c>] tcp_setsockopt+0x2c/0x30 [ 2860.657097] [<ffffffff81767b74>] sock_common_setsockopt+0x14/0x20 [ 2860.657100] [<ffffffff817669e1>] SyS_setsockopt+0x71/0xc0 [ 2860.657104] [<ffffffff81865172>] entry_SYSCALL_64_fastpath+0x16/0x75 Since tcp_xmit_probe_skb() can be called from process context, use NET_INC_STATS() instead of NET_INC_STATS_BH(). Fixes: e520af4 ("tcp: add TCPWinProbe and TCPKeepAlive SNMP counters") Signed-off-by: Renato Westphal <[email protected]> Signed-off-by: David S. Miller <[email protected]>

Forcedeth currently uses disable_irq_lockdep and enable_irq_lockdep, which in some configurations simply calls local_irq_disable. This causes errant warnings in the netpoll path as in netpoll_send_skb_on_dev, where we disable irqs using local_irq_save, leading to the following warning: WARNING: at net/core/netpoll.c:352 netpoll_send_skb_on_dev+0x243/0x250() (Not tainted) Hardware name: netpoll_send_skb_on_dev(): eth0 enabled interrupts in poll (nv_start_xmit_optimized+0x0/0x860 [forcedeth]) Modules linked in: netconsole(+) configfs ipv6 iptable_filter ip_tables ppdev parport_pc parport sg microcode serio_raw edac_core edac_mce_amd k8temp snd_hda_codec_realtek snd_hda_codec_generic forcedeth snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc i2c_nforce2 i2c_core shpchp ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif pata_amd ata_generic pata_acpi sata_nv dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan] Pid: 1940, comm: modprobe Not tainted 2.6.32-573.7.1.el6.x86_64.debug #1 Call Trace: [<ffffffff8107bbc1>] ? warn_slowpath_common+0x91/0xe0 [<ffffffff8107bcc6>] ? warn_slowpath_fmt+0x46/0x60 [<ffffffffa00fe5b0>] ? nv_start_xmit_optimized+0x0/0x860 [forcedeth] [<ffffffff814b3593>] ? netpoll_send_skb_on_dev+0x243/0x250 [<ffffffff814b37c9>] ? netpoll_send_udp+0x229/0x270 [<ffffffffa02e3299>] ? write_msg+0x39/0x110 [netconsole] [<ffffffffa02e331b>] ? write_msg+0xbb/0x110 [netconsole] [<ffffffff8107bd55>] ? __call_console_drivers+0x75/0x90 [<ffffffff8107bdba>] ? _call_console_drivers+0x4a/0x80 [<ffffffff8107c445>] ? release_console_sem+0xe5/0x250 [<ffffffff8107d200>] ? register_console+0x190/0x3e0 [<ffffffffa02e71a6>] ? init_netconsole+0x1a6/0x216 [netconsole] [<ffffffffa02e7000>] ? init_netconsole+0x0/0x216 [netconsole] [<ffffffff810020d0>] ? do_one_initcall+0xc0/0x280 [<ffffffff810d4933>] ? sys_init_module+0xe3/0x260 [<ffffffff8100b0d2>] ? system_call_fastpath+0x16/0x1b ---[ end trace f349c7af88e6a6d5 ]--- console [netcon0] enabled netconsole: network logging started Fix it by modifying the forcedeth code to use disable_irq_nosync_lockdep_irqsavedisable_irq_nosync_lockdep_irqsave instead, which saves and restores irq state properly. This also saves us a little code in the process Tested by the reporter, with successful restuls Patch applies to the head of the net tree Signed-off-by: Neil Horman <[email protected]> CC: "David S. Miller" <[email protected]> Reported-by: Vasily Averin <[email protected]> Signed-off-by: David S. Miller <[email protected]>

On the r7s72100 Genmai board the MTU2 driver currently triggers a common clock framework WARN_ON(enable_count) when disabling the clock due to the MTU2 driver after recent callback rework may call ->set_state_shutdown() multiple times. A similar issue was spotted for the TMU driver and fixed in: 452b132 clocksource/drivers/sh_tmu: Fix traceback spotted in -next On r7s72100 Genmai v4.3-rc7 built with shmobile_defconfig spits out the following during boot: sh_mtu2 fcff0000.timer: ch0: used for clock events ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:675 clk_core_disable+0x2c/0x6c() CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.3.0-rc7 #1 Hardware name: Generic R7S72100 (Flattened Device Tree) Backtrace: [<c00133d4>] (dump_backtrace) from [<c0013570>] (show_stack+0x18/0x1c) [<c0013558>] (show_stack) from [<c01c7aac>] (dump_stack+0x74/0x90) [<c01c7a38>] (dump_stack) from [<c00272fc>] (warn_slowpath_common+0x88/0xb4) [<c0027274>] (warn_slowpath_common) from [<c0027400>] (warn_slowpath_null+0x24/0x2c) [<c00273dc>] (warn_slowpath_null) from [<c03a9320>] (clk_core_disable+0x2c/0x6c) [<c03a92f4>] (clk_core_disable) from [<c03aa0a0>] (clk_disable+0x40/0x4c) [<c03aa060>] (clk_disable) from [<c0395d2c>] (sh_mtu2_disable+0x24/0x50) [<c0395d08>] (sh_mtu2_disable) from [<c0395d6c>] (sh_mtu2_clock_event_shutdown+0x14/0x1c) [<c0395d58>] (sh_mtu2_clock_event_shutdown) from [<c007d7d0>] (clockevents_switch_state+0xc8/0x114) [<c007d708>] (clockevents_switch_state) from [<c007d834>] (clockevents_shutdown+0x18/0x28) [<c007d81c>] (clockevents_shutdown) from [<c007dd58>] (clockevents_exchange_device+0x70/0x78) [<c007dce8>] (clockevents_exchange_device) from [<c007e578>] (tick_check_new_device+0x88/0xe0) [<c007e4f0>] (tick_check_new_device) from [<c007daf0>] (clockevents_register_device+0xac/0x120) [<c007da44>] (clockevents_register_device) from [<c0395be8>] (sh_mtu2_probe+0x230/0x350) [<c03959b8>] (sh_mtu2_probe) from [<c028b6f0>] (platform_drv_probe+0x50/0x98) Reported-by: Chris Brandt <[email protected]> Fixes: 19a9ffb ("clockevents/drivers/sh_mtu2: Migrate to new 'set-state' interface") Cc: Viresh Kumar <[email protected]> Cc: Laurent Pinchart <[email protected]> Signed-off-by: Magnus Damm <[email protected]> Signed-off-by: Daniel Lezcano <[email protected]> Reviewed-by: Viresh Kumar <[email protected]>

commit 8832317 upstream. Currently we do not validate rtas.entry before calling enter_rtas(). This leads to a kernel oops when user space calls rtas system call on a powernv platform (see below). This patch adds code to validate rtas.entry before making enter_rtas() call. Oops: Exception in kernel mode, sig: 4 [#1] SMP NR_CPUS=1024 NUMA PowerNV task: c000000004294b80 ti: c0000007e1a78000 task.ti: c0000007e1a78000 NIP: 0000000000000000 LR: 0000000000009c14 CTR: c000000000423140 REGS: c0000007e1a7b920 TRAP: 0e40 Not tainted (3.18.17-340.el7_1.pkvm3_1_0.2400.1.ppc64le) MSR: 1000000000081000 <HV,ME> CR: 00000000 XER: 00000000 CFAR: c000000000009c0c SOFTE: 0 NIP [0000000000000000] (null) LR [0000000000009c14] 0x9c14 Call Trace: [c0000007e1a7bba0] [c00000000041a7f4] avc_has_perm_noaudit+0x54/0x110 (unreliable) [c0000007e1a7bd80] [c00000000002ddc0] ppc_rtas+0x150/0x2d0 [c0000007e1a7be30] [c000000000009358] syscall_exit+0x0/0x98 Fixes: 55190f8 ("powerpc: Add skeleton PowerNV platform") Reported-by: NAGESWARA R. SASTRY <[email protected]> Signed-off-by: Vasant Hegde <[email protected]> [mpe: Reword change log, trim oops, and add stable + fixes] Signed-off-by: Michael Ellerman <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

[ Upstream commit 74e98eb ] There was no verification that an underlying transport exists when creating a connection, this would cause dereferencing a NULL ptr. It might happen on sockets that weren't properly bound before attempting to send a message, which will cause a NULL ptr deref: [135546.047719] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN [135546.051270] Modules linked in: [135546.051781] CPU: 4 PID: 15650 Comm: trinity-c4 Not tainted 4.2.0-next-20150902-sasha-00041-gbaa1222-dirty #2527 [135546.053217] task: ffff8800835bc000 ti: ffff8800bc708000 task.ti: ffff8800bc708000 [135546.054291] RIP: __rds_conn_create (net/rds/connection.c:194) [135546.055666] RSP: 0018:ffff8800bc70fab0 EFLAGS: 00010202 [135546.056457] RAX: dffffc0000000000 RBX: 0000000000000f2c RCX: ffff8800835bc000 [135546.057494] RDX: 0000000000000007 RSI: ffff8800835bccd8 RDI: 0000000000000038 [135546.058530] RBP: ffff8800bc70fb18 R08: 0000000000000001 R09: 0000000000000000 [135546.059556] R10: ffffed014d7a3a23 R11: ffffed014d7a3a21 R12: 0000000000000000 [135546.060614] R13: 0000000000000001 R14: ffff8801ec3d0000 R15: 0000000000000000 [135546.061668] FS: 00007faad4ffb700(0000) GS:ffff880252000000(0000) knlGS:0000000000000000 [135546.062836] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [135546.063682] CR2: 000000000000846a CR3: 000000009d137000 CR4: 00000000000006a0 [135546.064723] Stack: [135546.065048] ffffffffafe2055c ffffffffafe23fc1 ffffed00493097bf ffff8801ec3d0008 [135546.066247] 0000000000000000 00000000000000d0 0000000000000000 ac194a24c0586342 [135546.067438] 1ffff100178e1f78 ffff880320581b00 ffff8800bc70fdd0 ffff880320581b00 [135546.068629] Call Trace: [135546.069028] ? __rds_conn_create (include/linux/rcupdate.h:856 net/rds/connection.c:134) [135546.069989] ? rds_message_copy_from_user (net/rds/message.c:298) [135546.071021] rds_conn_create_outgoing (net/rds/connection.c:278) [135546.071981] rds_sendmsg (net/rds/send.c:1058) [135546.072858] ? perf_trace_lock (include/trace/events/lock.h:38) [135546.073744] ? lockdep_init (kernel/locking/lockdep.c:3298) [135546.074577] ? rds_send_drop_to (net/rds/send.c:976) [135546.075508] ? __might_fault (./arch/x86/include/asm/current.h:14 mm/memory.c:3795) [135546.076349] ? __might_fault (mm/memory.c:3795) [135546.077179] ? rds_send_drop_to (net/rds/send.c:976) [135546.078114] sock_sendmsg (net/socket.c:611 net/socket.c:620) [135546.078856] SYSC_sendto (net/socket.c:1657) [135546.079596] ? SYSC_connect (net/socket.c:1628) [135546.080510] ? trace_dump_stack (kernel/trace/trace.c:1926) [135546.081397] ? ring_buffer_unlock_commit (kernel/trace/ring_buffer.c:2479 kernel/trace/ring_buffer.c:2558 kernel/trace/ring_buffer.c:2674) [135546.082390] ? trace_buffer_unlock_commit (kernel/trace/trace.c:1749) [135546.083410] ? trace_event_raw_event_sys_enter (include/trace/events/syscalls.h:16) [135546.084481] ? do_audit_syscall_entry (include/trace/events/syscalls.h:16) [135546.085438] ? trace_buffer_unlock_commit (kernel/trace/trace.c:1749) [135546.085515] rds_ib_laddr_check(): addr 36.74.25.172 ret -99 node type -1 Acked-by: Santosh Shilimkar <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 19cd80a upstream. It is not permitted to set task state before lock. usblp_wwait sets the state to TASK_INTERRUPTIBLE and calls mutex_lock_interruptible. Upon return from that function, the state will be TASK_RUNNING again. This is clearly a bug and a warning is generated with LOCKDEP too: WARNING: CPU: 1 PID: 5109 at kernel/sched/core.c:7404 __might_sleep+0x7d/0x90() do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffffa0c588d0>] usblp_wwait+0xa0/0x310 [usblp] Modules linked in: ... CPU: 1 PID: 5109 Comm: captmon Tainted: G W 4.2.5-0.gef2823b-default #1 Hardware name: LENOVO 23252SG/23252SG, BIOS G2ET33WW (1.13 ) 07/24/2012 ffffffff81a4edce ffff880236ec7ba8 ffffffff81716651 0000000000000000 ffff880236ec7bf8 ffff880236ec7be8 ffffffff8106e146 0000000000000282 ffffffff81a50119 000000000000028b 0000000000000000 ffff8802dab7c508 Call Trace: ... [<ffffffff8106e1c6>] warn_slowpath_fmt+0x46/0x50 [<ffffffff8109a8bd>] __might_sleep+0x7d/0x90 [<ffffffff8171b20f>] mutex_lock_interruptible_nested+0x2f/0x4b0 [<ffffffffa0c588fc>] usblp_wwait+0xcc/0x310 [usblp] [<ffffffffa0c58bb2>] usblp_write+0x72/0x350 [usblp] [<ffffffff8121ed98>] __vfs_write+0x28/0xf0 ... Commit 7f47735 (usblp: Implement the ENOSPC convention) moved the set prior locking. So move it back after the lock. Signed-off-by: Jiri Slaby <[email protected]> Fixes: 7f47735 ("usblp: Implement the ENOSPC convention") Acked-By: Pete Zaitcev <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

When a43eec3 ("bpf: introduce bpf_perf_event_output() helper") added PERF_COUNT_SW_BPF_OUTPUT we ended up with a new entry in the event_symbols_sw array that wasn't initialized, thus set to NULL, fix print_symbol_events() to check for that case so that we don't crash if this happens again. (gdb) bt #0 __match_glob (ignore_space=false, pat=<optimized out>, str=<optimized out>) at util/string.c:198 #1 strglobmatch (str=<optimized out>, pat=pat@entry=0x7fffffffe61d "stall") at util/string.c:252 #2 0x00000000004993a5 in print_symbol_events (type=1, syms=0x872880 <event_symbols_sw+160>, max=11, name_only=false, event_glob=0x7fffffffe61d "stall") at util/parse-events.c:1615 #3 print_events (event_glob=event_glob@entry=0x7fffffffe61d "stall", name_only=false) at util/parse-events.c:1675 #4 0x000000000042c79e in cmd_list (argc=1, argv=0x7fffffffe390, prefix=<optimized out>) at builtin-list.c:68 #5 0x00000000004788a5 in run_builtin (p=p@entry=0x871758 <commands+120>, argc=argc@entry=2, argv=argv@entry=0x7fffffffe390) at perf.c:370 #6 0x0000000000420ab0 in handle_internal_command (argv=0x7fffffffe390, argc=2) at perf.c:429 #7 run_argv (argv=0x7fffffffe110, argcp=0x7fffffffe11c) at perf.c:473 #8 main (argc=2, argv=0x7fffffffe390) at perf.c:588 (gdb) p event_symbols_sw[PERF_COUNT_SW_BPF_OUTPUT] $4 = {symbol = 0x0, alias = 0x0} (gdb) A patch to robustify perf to not segfault when the next counter gets added in the kernel will follow this one. Reported-by: Ingo Molnar <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: David Ahern <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Wang Nan <[email protected]> Link: http://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

When we do cat /sys/kernel/debug/tracing/printk_formats, we hit kernel panic at t_show. general protection fault: 0000 [#1] PREEMPT SMP CPU: 0 PID: 2957 Comm: sh Tainted: G W O 3.14.55-x86_64-01062-gd4acdc7 #2 RIP: 0010:[<ffffffff811375b2>] [<ffffffff811375b2>] t_show+0x22/0xe0 RSP: 0000:ffff88002b4ebe80 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000004 RDX: 0000000000000004 RSI: ffffffff81fd26a6 RDI: ffff880032f9f7b1 RBP: ffff88002b4ebe98 R08: 0000000000001000 R09: 000000000000ffec R10: 0000000000000000 R11: 000000000000000f R12: ffff880004d9b6c0 R13: 7365725f6d706400 R14: ffff880004d9b6c0 R15: ffffffff82020570 FS: 0000000000000000(0000) GS:ffff88003aa00000(0063) knlGS:00000000f776bc40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f6c02ff0 CR3: 000000002c2b3000 CR4: 00000000001007f0 Call Trace: [<ffffffff811dc076>] seq_read+0x2f6/0x3e0 [<ffffffff811b749b>] vfs_read+0x9b/0x160 [<ffffffff811b7f69>] SyS_read+0x49/0xb0 [<ffffffff81a3a4b9>] ia32_do_call+0x13/0x13 ---[ end trace 5bd9eb630614861e ]--- Kernel panic - not syncing: Fatal exception When the first time find_next calls find_next_mod_format, it should iterate the trace_bprintk_fmt_list to find the first print format of the module. However in current code, start_index is smaller than *pos at first, and code will not iterate the list. Latter container_of will get the wrong address with former v, which will cause mod_fmt be a meaningless object and so is the returned mod_fmt->fmt. This patch will fix it by correcting the start_index. After fixed, when the first time calls find_next_mod_format, start_index will be equal to *pos, and code will iterate the trace_bprintk_fmt_list to get the right module printk format, so is the returned mod_fmt->fmt. Link: http://lkml.kernel.org/r/[email protected] Cc: [email protected] # 3.12+ Fixes: 102c932 "tracing: Add __tracepoint_string() to export string pointers" Signed-off-by: Qiu Peiyang <[email protected]> Signed-off-by: Steven Rostedt <[email protected]>

This reverts commit 87b5ed8 ("ASoC: Intel: Skylake: fix memory leak") as it causes regression on Skylake devices The SKL drivers can be deferred probe. The topology file based widgets can have references to topology file so this can't be freed until card is fully created, so revert this patch for now [ 66.682767] BUG: unable to handle kernel paging request at ffffc900001363fc [ 66.690735] IP: [<ffffffff806c94dd>] strnlen+0xd/0x40 [ 66.696509] PGD 16e035067 PUD 16e036067 PMD 16e038067 PTE 0 [ 66.702925] Oops: 0000 [#1] PREEMPT SMP [ 66.768390] CPU: 3 PID: 57 Comm: kworker/u16:3 Tainted: G O 4.4.0-rc7-skl #62 [ 66.778869] Hardware name: Intel Corporation Skylake Client platform [ 66.793201] Workqueue: deferwq deferred_probe_work_func [ 66.799173] task: ffff88008b700f40 ti: ffff88008b704000 task.ti: ffff88008b704000 [ 66.807692] RIP: 0010:[<ffffffff806c94dd>] [<ffffffff806c94dd>] strnlen+0xd/0x40 [ 66.816243] RSP: 0018:ffff88008b707878 EFLAGS: 00010286 [ 66.822293] RAX: ffffffff80e60a82 RBX: 000000000000000e RCX: fffffffffffffffe [ 66.830406] RDX: ffffc900001363fc RSI: ffffffffffffffff RDI: ffffc900001363fc [ 66.838520] RBP: ffff88008b707878 R08: 000000000000ffff R09: 000000000000ffff [ 66.846649] R10: 0000000000000001 R11: ffffffffa01c6368 R12: ffffc900001363fc [ 66.854765] R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000000 [ 66.862910] FS: 0000000000000000(0000) GS:ffff88016ecc0000(0000) knlGS:0000000000000000 [ 66.872150] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 66.878696] CR2: ffffc900001363fc CR3: 0000000002c09000 CR4: 00000000003406e0 [ 66.886820] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 66.894938] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 66.903052] Stack: [ 66.905346] ffff88008b7078b0 ffffffff806cb1db 000000000000000e 0000000000000000 [ 66.913854] ffff88008b707928 ffffffffa00d1050 ffffffffa00d104e ffff88008b707918 [ 66.922353] ffffffff806ccbd6 ffff88008b707948 0000000000000046 ffff88008b707940 [ 66.930855] Call Trace: [ 66.933646] [<ffffffff806cb1db>] string.isra.4+0x3b/0xd0 [ 66.939793] [<ffffffff806ccbd6>] vsnprintf+0x116/0x540 [ 66.945742] [<ffffffff806d02f0>] kvasprintf+0x40/0x80 [ 66.951591] [<ffffffff806d0370>] kasprintf+0x40/0x50 [ 66.957359] [<ffffffffa00c085f>] dapm_create_or_share_kcontrol+0x1cf/0x300 [snd_soc_core] [ 66.966771] [<ffffffff8057dd1e>] ? __kmalloc+0x16e/0x2a0 [ 66.972931] [<ffffffffa00c0dab>] snd_soc_dapm_new_widgets+0x41b/0x4b0 [snd_soc_core] [ 66.981857] [<ffffffffa00be8c0>] ? snd_soc_dapm_add_routes+0xb0/0xd0 [snd_soc_core] [ 67.007828] [<ffffffffa00b92ed>] soc_probe_component+0x23d/0x360 [snd_soc_core] [ 67.016244] [<ffffffff80b14e69>] ? mutex_unlock+0x9/0x10 [ 67.022405] [<ffffffffa00ba02f>] snd_soc_instantiate_card+0x47f/0xd10 [snd_soc_core] [ 67.031329] [<ffffffff8049eeb2>] ? debug_mutex_init+0x32/0x40 [ 67.037973] [<ffffffffa00baa92>] snd_soc_register_card+0x1d2/0x2b0 [snd_soc_core] [ 67.046619] [<ffffffffa00c8b54>] devm_snd_soc_register_card+0x44/0x80 [snd_soc_core] [ 67.055539] [<ffffffffa01c303b>] skylake_audio_probe+0x1b/0x20 [snd_soc_skl_rt286] [ 67.064292] [<ffffffff808aa887>] platform_drv_probe+0x37/0x90 Signed-off-by: Vinod Koul <[email protected]> Signed-off-by: Mark Brown <[email protected]>

kernel test robot has reported the following crash: BUG: unable to handle kernel NULL pointer dereference at 00000100 IP: [<c1074df6>] __queue_work+0x26/0x390 *pdpt = 0000000000000000 *pde = f000ff53f000ff53 *pde = f000ff53f000ff53 Oops: 0000 [#1] PREEMPT PREEMPT SMP SMP CPU: 0 PID: 24 Comm: kworker/0:1 Not tainted 4.4.0-rc4-00139-g373ccbe #1 Workqueue: events vmstat_shepherd task: cb684600 ti: cb7ba000 task.ti: cb7ba000 EIP: 0060:[<c1074df6>] EFLAGS: 00010046 CPU: 0 EIP is at __queue_work+0x26/0x390 EAX: 00000046 EBX: cbb37800 ECX: cbb37800 EDX: 00000000 ESI: 00000000 EDI: 00000000 EBP: cb7bbe68 ESP: cb7bbe38 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 CR0: 8005003b CR2: 00000100 CR3: 01fd5000 CR4: 000006b0 Stack: Call Trace: __queue_delayed_work+0xa1/0x160 queue_delayed_work_on+0x36/0x60 vmstat_shepherd+0xad/0xf0 process_one_work+0x1aa/0x4c0 worker_thread+0x41/0x440 kthread+0xb0/0xd0 ret_from_kernel_thread+0x21/0x40 The reason is that start_shepherd_timer schedules the shepherd work item which uses vmstat_wq (vmstat_shepherd) before setup_vmstat allocates that workqueue so if the further initialization takes more than HZ we might end up scheduling on a NULL vmstat_wq. This is really unlikely but not impossible. Fixes: 373ccbe ("mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make any progress") Reported-by: kernel test robot <[email protected]> Signed-off-by: Michal Hocko <[email protected]> Tested-by: Tetsuo Handa <[email protected]> Cc: [email protected] Cc: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>

[ Upstream commit 9b29972 ] Fix null pointer dereference by changing register_cache() to return an int instead of being void. This allows it to return -ENOMEM or -ENODEV and enables upper layers to handle the OOM case without NULL pointer issues. See this thread: http://thread.gmane.org/gmane.linux.kernel.bcache.devel/3521 Fixes this error: gargamel:/sys/block/md5/bcache# echo /dev/sdh2 > /sys/fs/bcache/register bcache: register_cache() error opening sdh2: cannot allocate memory BUG: unable to handle kernel NULL pointer dereference at 00000000000009b8 IP: [<ffffffffc05a7e8d>] cache_set_flush+0x102/0x15c [bcache] PGD 120dff067 PUD 1119a3067 PMD 0 Oops: 0000 [#1] SMP Modules linked in: veth ip6table_filter ip6_tables (...) CPU: 4 PID: 3371 Comm: kworker/4:3 Not tainted 4.4.2-amd64-i915-volpreempt-20160213bc1 #3 Hardware name: System manufacturer System Product Name/P8H67-M PRO, BIOS 3904 04/27/2013 Workqueue: events cache_set_flush [bcache] task: ffff88020d5dc280 ti: ffff88020b6f8000 task.ti: ffff88020b6f8000 RIP: 0010:[<ffffffffc05a7e8d>] [<ffffffffc05a7e8d>] cache_set_flush+0x102/0x15c [bcache] Signed-off-by: Eric Wheeler <[email protected]> Tested-by: Marc MERLIN <[email protected]> Cc: <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

[ Upstream commit d6785d9 ] Running the following command: busybox cat /sys/kernel/debug/tracing/trace_pipe > /dev/null with any tracing enabled pretty very quickly leads to various NULL pointer dereferences and VM BUG_ON()s, such as these: BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: [<ffffffff8119df6c>] generic_pipe_buf_release+0xc/0x40 Call Trace: [<ffffffff811c48a3>] splice_direct_to_actor+0x143/0x1e0 [<ffffffff811c42e0>] ? generic_pipe_buf_nosteal+0x10/0x10 [<ffffffff811c49cf>] do_splice_direct+0x8f/0xb0 [<ffffffff81196869>] do_sendfile+0x199/0x380 [<ffffffff81197600>] SyS_sendfile64+0x90/0xa0 [<ffffffff8192cbee>] entry_SYSCALL_64_fastpath+0x12/0x6d page dumped because: VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0) kernel BUG at include/linux/mm.h:367! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC RIP: [<ffffffff8119df9c>] generic_pipe_buf_release+0x3c/0x40 Call Trace: [<ffffffff811c48a3>] splice_direct_to_actor+0x143/0x1e0 [<ffffffff811c42e0>] ? generic_pipe_buf_nosteal+0x10/0x10 [<ffffffff811c49cf>] do_splice_direct+0x8f/0xb0 [<ffffffff81196869>] do_sendfile+0x199/0x380 [<ffffffff81197600>] SyS_sendfile64+0x90/0xa0 [<ffffffff8192cd1e>] tracesys_phase2+0x84/0x89 (busybox's cat uses sendfile(2), unlike the coreutils version) This is because tracing_splice_read_pipe() can call splice_to_pipe() with spd->nr_pages == 0. spd_pages underflows in splice_to_pipe() and we fill the page pointers and the other fields of the pipe_buffers with garbage. All other callers of splice_to_pipe() avoid calling it when nr_pages == 0, and we could make tracing_splice_read_pipe() do that too, but it seems reasonable to have splice_to_page() handle this condition gracefully. Cc: [email protected] Signed-off-by: Rabin Vincent <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Al Viro <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

…er() [ Upstream commit 894f2fc ] When unexpected situation happened (e.g. tx/rx irq happened while DMAC is used), the usbhsf_pkt_handler() was possible to cause NULL pointer dereference like the followings: Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c0004000 [00000000] *pgd=00000000 Internal error: Oops: 80000007 [#1] SMP ARM Modules linked in: usb_f_acm u_serial g_serial libcomposite CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc6-00842-gac57066-dirty #63 Hardware name: Generic R8A7790 (Flattened Device Tree) task: c0729c00 ti: c0724000 task.ti: c0724000 PC is at 0x0 LR is at usbhsf_pkt_handler+0xac/0x118 pc : [<00000000>] lr : [<c03257e0>] psr: 60000193 sp : c0725db8 ip : 00000000 fp : c0725df4 r10: 00000001 r9 : 00000193 r8 : ef3ccab4 r7 : ef3cca10 r6 : eea4586c r5 : 00000000 r4 : ef19ceb4 r3 : 00000000 r2 : 0000009c r1 : c0725dc4 r0 : ef19ceb4 This patch adds a condition to avoid the dereference. Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support") Cc: <[email protected]> # v3.1+ Signed-off-by: Yoshihiro Shimoda <[email protected]> Signed-off-by: Felipe Balbi <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

[ Upstream commit 56f23fd ] If we rename an inode A (be it a file or a directory), create a new inode B with the old name of inode A and under the same parent directory, fsync inode B and then power fail, at log tree replay time we end up removing inode A completely. If inode A is a directory then all its files are gone too. Example scenarios where this happens: This is reproducible with the following steps, taken from a couple of test cases written for fstests which are going to be submitted upstream soon: # Scenario 1 mkfs.btrfs -f /dev/sdc mount /dev/sdc /mnt mkdir -p /mnt/a/x echo "hello" > /mnt/a/x/foo echo "world" > /mnt/a/x/bar sync mv /mnt/a/x /mnt/a/y mkdir /mnt/a/x xfs_io -c fsync /mnt/a/x <power failure happens> The next time the fs is mounted, log tree replay happens and the directory "y" does not exist nor do the files "foo" and "bar" exist anywhere (neither in "y" nor in "x", nor the root nor anywhere). # Scenario 2 mkfs.btrfs -f /dev/sdc mount /dev/sdc /mnt mkdir /mnt/a echo "hello" > /mnt/a/foo sync mv /mnt/a/foo /mnt/a/bar echo "world" > /mnt/a/foo xfs_io -c fsync /mnt/a/foo <power failure happens> The next time the fs is mounted, log tree replay happens and the file "bar" does not exists anymore. A file with the name "foo" exists and it matches the second file we created. Another related problem that does not involve file/data loss is when a new inode is created with the name of a deleted snapshot and we fsync it: mkfs.btrfs -f /dev/sdc mount /dev/sdc /mnt mkdir /mnt/testdir btrfs subvolume snapshot /mnt /mnt/testdir/snap btrfs subvolume delete /mnt/testdir/snap rmdir /mnt/testdir mkdir /mnt/testdir xfs_io -c fsync /mnt/testdir # or fsync some file inside /mnt/testdir <power failure> The next time the fs is mounted the log replay procedure fails because it attempts to delete the snapshot entry (which has dir item key type of BTRFS_ROOT_ITEM_KEY) as if it were a regular (non-root) entry, resulting in the following error that causes mount to fail: [52174.510532] BTRFS info (device dm-0): failed to delete reference to snap, inode 257 parent 257 [52174.512570] ------------[ cut here ]------------ [52174.513278] WARNING: CPU: 12 PID: 28024 at fs/btrfs/inode.c:3986 __btrfs_unlink_inode+0x178/0x351 [btrfs]() [52174.514681] BTRFS: Transaction aborted (error -2) [52174.515630] Modules linked in: btrfs dm_flakey dm_mod overlay crc32c_generic ppdev xor raid6_pq acpi_cpufreq parport_pc tpm_tis sg parport tpm evdev i2c_piix4 proc [52174.521568] CPU: 12 PID: 28024 Comm: mount Tainted: G W 4.5.0-rc6-btrfs-next-27+ #1 [52174.522805] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS by qemu-project.org 04/01/2014 [52174.524053] 0000000000000000 ffff8801df2a7710 ffffffff81264e93 ffff8801df2a7758 [52174.524053] 0000000000000009 ffff8801df2a7748 ffffffff81051618 ffffffffa03591cd [52174.524053] 00000000fffffffe ffff88015e6e5000 ffff88016dbc3c88 ffff88016dbc3c88 [52174.524053] Call Trace: [52174.524053] [<ffffffff81264e93>] dump_stack+0x67/0x90 [52174.524053] [<ffffffff81051618>] warn_slowpath_common+0x99/0xb2 [52174.524053] [<ffffffffa03591cd>] ? __btrfs_unlink_inode+0x178/0x351 [btrfs] [52174.524053] [<ffffffff81051679>] warn_slowpath_fmt+0x48/0x50 [52174.524053] [<ffffffffa03591cd>] __btrfs_unlink_inode+0x178/0x351 [btrfs] [52174.524053] [<ffffffff8118f5e9>] ? iput+0xb0/0x284 [52174.524053] [<ffffffffa0359fe8>] btrfs_unlink_inode+0x1c/0x3d [btrfs] [52174.524053] [<ffffffffa038631e>] check_item_in_log+0x1fe/0x29b [btrfs] [52174.524053] [<ffffffffa0386522>] replay_dir_deletes+0x167/0x1cf [btrfs] [52174.524053] [<ffffffffa038739e>] fixup_inode_link_count+0x289/0x2aa [btrfs] [52174.524053] [<ffffffffa038748a>] fixup_inode_link_counts+0xcb/0x105 [btrfs] [52174.524053] [<ffffffffa038a5ec>] btrfs_recover_log_trees+0x258/0x32c [btrfs] [52174.524053] [<ffffffffa03885b2>] ? replay_one_extent+0x511/0x511 [btrfs] [52174.524053] [<ffffffffa034f288>] open_ctree+0x1dd4/0x21b9 [btrfs] [52174.524053] [<ffffffffa032b753>] btrfs_mount+0x97e/0xaed [btrfs] [52174.524053] [<ffffffff8108e1b7>] ? trace_hardirqs_on+0xd/0xf [52174.524053] [<ffffffff8117bafa>] mount_fs+0x67/0x131 [52174.524053] [<ffffffff81193003>] vfs_kern_mount+0x6c/0xde [52174.524053] [<ffffffffa032af81>] btrfs_mount+0x1ac/0xaed [btrfs] [52174.524053] [<ffffffff8108e1b7>] ? trace_hardirqs_on+0xd/0xf [52174.524053] [<ffffffff8108c262>] ? lockdep_init_map+0xb9/0x1b3 [52174.524053] [<ffffffff8117bafa>] mount_fs+0x67/0x131 [52174.524053] [<ffffffff81193003>] vfs_kern_mount+0x6c/0xde [52174.524053] [<ffffffff8119590f>] do_mount+0x8a6/0x9e8 [52174.524053] [<ffffffff811358dd>] ? strndup_user+0x3f/0x59 [52174.524053] [<ffffffff81195c65>] SyS_mount+0x77/0x9f [52174.524053] [<ffffffff814935d7>] entry_SYSCALL_64_fastpath+0x12/0x6b [52174.561288] ---[ end trace 6b53049efb1a3ea6 ]--- Fix this by forcing a transaction commit when such cases happen. This means we check in the commit root of the subvolume tree if there was any other inode with the same reference when the inode we are fsync'ing is a new inode (created in the current transaction). Test cases for fstests, covering all the scenarios given above, were submitted upstream for fstests: * fstests: generic test for fsync after renaming directory https://patchwork.kernel.org/patch/8694281/ * fstests: generic test for fsync after renaming file https://patchwork.kernel.org/patch/8694301/ * fstests: add btrfs test for fsync after snapshot deletion https://patchwork.kernel.org/patch/8670671/ Cc: [email protected] Signed-off-by: Filipe Manana <[email protected]> Signed-off-by: Chris Mason <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

[ Upstream commit ad6b1d9 ] The problem seems to be that if a new device is detected while we have already removed the shared HCD, then many of the xhci operations (e.g. xhci_alloc_dev(), xhci_setup_device()) hang as command never completes. I don't think XHCI can operate without the shared HCD as we've already called xhci_halt() in xhci_only_stop_hcd() when shared HCD goes away. We need to prevent new commands from being queued not only when HCD is dying but also when HCD is halted. The following lockup was detected while testing the otg state machine. [ 178.199951] xhci-hcd xhci-hcd.0.auto: xHCI Host Controller [ 178.205799] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 1 [ 178.214458] xhci-hcd xhci-hcd.0.auto: hcc params 0x0220f04c hci version 0x100 quirks 0x00010010 [ 178.223619] xhci-hcd xhci-hcd.0.auto: irq 400, io mem 0x48890000 [ 178.230677] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002 [ 178.237796] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 178.245358] usb usb1: Product: xHCI Host Controller [ 178.250483] usb usb1: Manufacturer: Linux 4.0.0-rc1-00024-g6111320 xhci-hcd [ 178.257783] usb usb1: SerialNumber: xhci-hcd.0.auto [ 178.267014] hub 1-0:1.0: USB hub found [ 178.272108] hub 1-0:1.0: 1 port detected [ 178.278371] xhci-hcd xhci-hcd.0.auto: xHCI Host Controller [ 178.284171] xhci-hcd xhci-hcd.0.auto: new USB bus registered, assigned bus number 2 [ 178.294038] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003 [ 178.301183] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 178.308776] usb usb2: Product: xHCI Host Controller [ 178.313902] usb usb2: Manufacturer: Linux 4.0.0-rc1-00024-g6111320 xhci-hcd [ 178.321222] usb usb2: SerialNumber: xhci-hcd.0.auto [ 178.329061] hub 2-0:1.0: USB hub found [ 178.333126] hub 2-0:1.0: 1 port detected [ 178.567585] dwc3 48890000.usb: usb_otg_start_host 0 [ 178.572707] xhci-hcd xhci-hcd.0.auto: remove, state 4 [ 178.578064] usb usb2: USB disconnect, device number 1 [ 178.586565] xhci-hcd xhci-hcd.0.auto: USB bus 2 deregistered [ 178.592585] xhci-hcd xhci-hcd.0.auto: remove, state 1 [ 178.597924] usb usb1: USB disconnect, device number 1 [ 178.603248] usb 1-1: new high-speed USB device number 2 using xhci-hcd [ 190.597337] INFO: task kworker/u4:0:6 blocked for more than 10 seconds. [ 190.604273] Not tainted 4.0.0-rc1-00024-g6111320 #1058 [ 190.610228] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 190.618443] kworker/u4:0 D c05c0ac0 0 6 2 0x00000000 [ 190.625120] Workqueue: usb_otg usb_otg_work [ 190.629533] [<c05c0ac0>] (__schedule) from [<c05c10ac>] (schedule+0x34/0x98) [ 190.636915] [<c05c10ac>] (schedule) from [<c05c1318>] (schedule_preempt_disabled+0xc/0x10) [ 190.645591] [<c05c1318>] (schedule_preempt_disabled) from [<c05c23d0>] (mutex_lock_nested+0x1ac/0x3fc) [ 190.655353] [<c05c23d0>] (mutex_lock_nested) from [<c046cf8c>] (usb_disconnect+0x3c/0x208) [ 190.664043] [<c046cf8c>] (usb_disconnect) from [<c0470cf0>] (_usb_remove_hcd+0x98/0x1d8) [ 190.672535] [<c0470cf0>] (_usb_remove_hcd) from [<c0485da8>] (usb_otg_start_host+0x50/0xf4) [ 190.681299] [<c0485da8>] (usb_otg_start_host) from [<c04849a4>] (otg_set_protocol+0x5c/0xd0) [ 190.690153] [<c04849a4>] (otg_set_protocol) from [<c0484b88>] (otg_set_state+0x170/0xbfc) [ 190.698735] [<c0484b88>] (otg_set_state) from [<c0485740>] (otg_statemachine+0x12c/0x470) [ 190.707326] [<c0485740>] (otg_statemachine) from [<c0053c84>] (process_one_work+0x1b4/0x4a0) [ 190.716162] [<c0053c84>] (process_one_work) from [<c00540f8>] (worker_thread+0x154/0x44c) [ 190.724742] [<c00540f8>] (worker_thread) from [<c0058f88>] (kthread+0xd4/0xf0) [ 190.732328] [<c0058f88>] (kthread) from [<c000e810>] (ret_from_fork+0x14/0x24) [ 190.739898] 5 locks held by kworker/u4:0/6: [ 190.744274] #0: ("%s""usb_otg"){.+.+.+}, at: [<c0053bf4>] process_one_work+0x124/0x4a0 [ 190.752799] #1: ((&otgd->work)){+.+.+.}, at: [<c0053bf4>] process_one_work+0x124/0x4a0 [ 190.761326] #2: (&otgd->fsm.lock){+.+.+.}, at: [<c048562c>] otg_statemachine+0x18/0x470 [ 190.769934] #3: (usb_bus_list_lock){+.+.+.}, at: [<c0470ce8>] _usb_remove_hcd+0x90/0x1d8 [ 190.778635] #4: (&dev->mutex){......}, at: [<c046cf8c>] usb_disconnect+0x3c/0x208 [ 190.786700] INFO: task kworker/1:0:14 blocked for more than 10 seconds. [ 190.793633] Not tainted 4.0.0-rc1-00024-g6111320 #1058 [ 190.799567] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 190.807783] kworker/1:0 D c05c0ac0 0 14 2 0x00000000 [ 190.814457] Workqueue: usb_hub_wq hub_event [ 190.818866] [<c05c0ac0>] (__schedule) from [<c05c10ac>] (schedule+0x34/0x98) [ 190.826252] [<c05c10ac>] (schedule) from [<c05c4e40>] (schedule_timeout+0x13c/0x1ec) [ 190.834377] [<c05c4e40>] (schedule_timeout) from [<c05c19f0>] (wait_for_common+0xbc/0x150) [ 190.843062] [<c05c19f0>] (wait_for_common) from [<bf068a3c>] (xhci_setup_device+0x164/0x5cc [xhci_hcd]) [ 190.852986] [<bf068a3c>] (xhci_setup_device [xhci_hcd]) from [<c046b7f4>] (hub_port_init+0x3f4/0xb10) [ 190.862667] [<c046b7f4>] (hub_port_init) from [<c046eb64>] (hub_event+0x704/0x1018) [ 190.870704] [<c046eb64>] (hub_event) from [<c0053c84>] (process_one_work+0x1b4/0x4a0) [ 190.878919] [<c0053c84>] (process_one_work) from [<c00540f8>] (worker_thread+0x154/0x44c) [ 190.887503] [<c00540f8>] (worker_thread) from [<c0058f88>] (kthread+0xd4/0xf0) [ 190.895076] [<c0058f88>] (kthread) from [<c000e810>] (ret_from_fork+0x14/0x24) [ 190.902650] 5 locks held by kworker/1:0/14: [ 190.907023] #0: ("usb_hub_wq"){.+.+.+}, at: [<c0053bf4>] process_one_work+0x124/0x4a0 [ 190.915454] #1: ((&hub->events)){+.+.+.}, at: [<c0053bf4>] process_one_work+0x124/0x4a0 [ 190.924070] #2: (&dev->mutex){......}, at: [<c046e490>] hub_event+0x30/0x1018 [ 190.931768] #3: (&port_dev->status_lock){+.+.+.}, at: [<c046eb50>] hub_event+0x6f0/0x1018 [ 190.940558] #4: (&bus->usb_address0_mutex){+.+.+.}, at: [<c046b458>] hub_port_init+0x58/0xb10 Signed-off-by: Roger Quadros <[email protected]> Signed-off-by: Mathias Nyman <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

[ Upstream commit deba0a2 ] With the joys of things running concurrently, there's always a chance that the port we get passed in drm_dp_payload_send_msg() isn't actually valid anymore. Because of this, we need to make sure we validate the reference to the port before we use it otherwise we risk running into various race conditions. For instance, on the Dell MST monitor I have here for testing, hotplugging it enough times causes us to kernel panic: [drm:intel_mst_enable_dp] 1 [drm:drm_dp_update_payload_part2] payload 0 1 [drm:intel_get_hpd_pins] hotplug event received, stat 0x00200000, dig 0x10101011, pins 0x00000020 [drm:intel_hpd_irq_handler] digital hpd port B - short [drm:intel_dp_hpd_pulse] got hpd irq on port B - short [drm:intel_dp_check_mst_status] got esi 00 10 00 [drm:drm_dp_update_payload_part2] payload 1 1 general protection fault: 0000 [#1] SMP … Call Trace: [<ffffffffa012b632>] drm_dp_update_payload_part2+0xc2/0x130 [drm_kms_helper] [<ffffffffa032ef08>] intel_mst_enable_dp+0xf8/0x180 [i915] [<ffffffffa0310dbd>] haswell_crtc_enable+0x3ed/0x8c0 [i915] [<ffffffffa030c84d>] intel_atomic_commit+0x5ad/0x1590 [i915] [<ffffffffa01db877>] ? drm_atomic_set_crtc_for_connector+0x57/0xe0 [drm] [<ffffffffa01dc4e7>] drm_atomic_commit+0x37/0x60 [drm] [<ffffffffa0130a3a>] drm_atomic_helper_set_config+0x7a/0xb0 [drm_kms_helper] [<ffffffffa01cc482>] drm_mode_set_config_internal+0x62/0x100 [drm] [<ffffffffa01d02ad>] drm_mode_setcrtc+0x3cd/0x4e0 [drm] [<ffffffffa01c18e3>] drm_ioctl+0x143/0x510 [drm] [<ffffffffa01cfee0>] ? drm_mode_setplane+0x1b0/0x1b0 [drm] [<ffffffff810f79a7>] ? hrtimer_start_range_ns+0x1b7/0x3a0 [<ffffffff81212962>] do_vfs_ioctl+0x92/0x570 [<ffffffff81590852>] ? __sys_recvmsg+0x42/0x80 [<ffffffff81212eb9>] SyS_ioctl+0x79/0x90 [<ffffffff816b4e32>] entry_SYSCALL_64_fastpath+0x1a/0xa4 RIP [<ffffffffa012b026>] drm_dp_payload_send_msg+0x146/0x1f0 [drm_kms_helper] Which occurs because of the hotplug event shown in the log, which ends up causing DRM's dp helpers to drop the port we're updating the payload on and panic. CC: [email protected] Signed-off-by: Lyude <[email protected]> Reviewed-by: David Airlie <[email protected]> Signed-off-by: Dave Airlie <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

[ Upstream commit 103f611 ] Huge pages are not normally available to PV guests. Not suppressing hugetlbfs use results in an endless loop of page faults when user mode code tries to access a hugetlbfs mapped area (since the hypervisor denies such PTEs to be created, but error indications can't be propagated out of xen_set_pte_at(), just like for various of its siblings), and - once killed in an oops like this: kernel BUG at .../fs/hugetlbfs/inode.c:428! invalid opcode: 0000 [#1] SMP ... RIP: e030:[<ffffffff811c333b>] [<ffffffff811c333b>] remove_inode_hugepages+0x25b/0x320 ... Call Trace: [<ffffffff811c3415>] hugetlbfs_evict_inode+0x15/0x40 [<ffffffff81167b3d>] evict+0xbd/0x1b0 [<ffffffff8116514a>] __dentry_kill+0x19a/0x1f0 [<ffffffff81165b0e>] dput+0x1fe/0x220 [<ffffffff81150535>] __fput+0x155/0x200 [<ffffffff81079fc0>] task_work_run+0x60/0xa0 [<ffffffff81063510>] do_exit+0x160/0x400 [<ffffffff810637eb>] do_group_exit+0x3b/0xa0 [<ffffffff8106e8bd>] get_signal+0x1ed/0x470 [<ffffffff8100f854>] do_signal+0x14/0x110 [<ffffffff810030e9>] prepare_exit_to_usermode+0xe9/0xf0 [<ffffffff814178a5>] retint_user+0x8/0x13 This is CVE-2016-3961 / XSA-174. Reported-by: Vitaly Kuznetsov <[email protected]> Signed-off-by: Jan Beulich <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Boris Ostrovsky <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: David Vrabel <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Juergen Gross <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luis R. Rodriguez <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Toshi Kani <[email protected]> Cc: [email protected] Cc: xen-devel <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

[ Upstream commit 07d2390 ] In certain probe conditions the interrupt came right after registering the handler causing a NULL pointer exception because of uninitialized waitqueue: $ udevadm trigger i2c-gpio i2c-gpio-1: using pins 143 (SDA) and 144 (SCL) i2c-gpio i2c-gpio-3: using pins 53 (SDA) and 52 (SCL) Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = e8b3800 [00000000] *pgd=00000000 Internal error: Oops: 5 [#1] SMP ARM Modules linked in: snd_soc_i2s(+) i2c_gpio(+) snd_soc_idma snd_soc_s3c_dma snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ac97_bus spi_s3c64xx pwm_samsung dwc2 exynos_adc phy_exynos_usb2 exynosdrm exynos_rng rng_core rtc_s3c CPU: 0 PID: 717 Comm: data-provider-m Not tainted 4.6.0-rc1-next-20160401-00011-g1b8d87473b9e-dirty #101 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) (...) (__wake_up_common) from [<c0379624>] (__wake_up+0x38/0x4c) (__wake_up) from [<c0a41d30>] (ak8975_irq_handler+0x28/0x30) (ak8975_irq_handler) from [<c0386720>] (handle_irq_event_percpu+0x88/0x140) (handle_irq_event_percpu) from [<c038681c>] (handle_irq_event+0x44/0x68) (handle_irq_event) from [<c0389c40>] (handle_edge_irq+0xf0/0x19c) (handle_edge_irq) from [<c0385e04>] (generic_handle_irq+0x24/0x34) (generic_handle_irq) from [<c05ee360>] (exynos_eint_gpio_irq+0x50/0x68) (exynos_eint_gpio_irq) from [<c0386720>] (handle_irq_event_percpu+0x88/0x140) (handle_irq_event_percpu) from [<c038681c>] (handle_irq_event+0x44/0x68) (handle_irq_event) from [<c0389a70>] (handle_fasteoi_irq+0xb4/0x194) (handle_fasteoi_irq) from [<c0385e04>] (generic_handle_irq+0x24/0x34) (generic_handle_irq) from [<c03860b4>] (__handle_domain_irq+0x5c/0xb4) (__handle_domain_irq) from [<c0301774>] (gic_handle_irq+0x54/0x94) (gic_handle_irq) from [<c030c910>] (__irq_usr+0x50/0x80) The bug was reproduced on exynos4412-trats2 (with a max77693 device also using i2c-gpio) after building max77693 as a module. Cc: <[email protected]> Fixes: 94a6d5c ("iio:ak8975 Implement data ready interrupt handling") Signed-off-by: Krzysztof Kozlowski <[email protected]> Tested-by: Gregor Boirie <[email protected]> Signed-off-by: Jonathan Cameron <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

[ Upstream commit add05ce ] Stress testing showed that soft offline events for a process iterating "mmap-pagefault-munmap" loop can trigger VM_BUG_ON(PAGE_FLAGS_CHECK_AT_PREP) in __free_one_page(): Soft offlining page 0x70fe1 at 0x70100008d000 Soft offlining page 0x705fb at 0x70300008d000 page:ffffea0001c3f840 count:0 mapcount:0 mapping: (null) index:0x2 flags: 0x1fffff80800000(hwpoison) page dumped because: VM_BUG_ON_PAGE(page->flags & ((1 << 25) - 1)) ------------[ cut here ]------------ kernel BUG at /src/linux-dev/mm/page_alloc.c:585! invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC Modules linked in: cfg80211 rfkill crc32c_intel microcode ppdev parport_pc pcspkr serio_raw virtio_balloon parport i2c_piix4 virtio_blk virtio_net ata_generic pata_acpi floppy CPU: 3 PID: 1779 Comm: test_base_madv_ Not tainted 4.0.0-v4.0-150511-1451-00009-g82360a3730e6 #139 RIP: free_pcppages_bulk+0x52a/0x6f0 Call Trace: drain_pages_zone+0x3d/0x50 drain_local_pages+0x1d/0x30 on_each_cpu_mask+0x46/0x80 drain_all_pages+0x14b/0x1e0 soft_offline_page+0x432/0x6e0 SyS_madvise+0x73c/0x780 system_call_fastpath+0x12/0x17 Code: ff 89 45 b4 48 8b 45 c0 48 83 b8 a8 00 00 00 00 0f 85 e3 fb ff ff 0f 1f 00 0f 0b 48 8b 7d 90 48 c7 c6 e8 95 a6 81 e8 e6 32 02 00 <0f> 0b 8b 45 cc 49 89 47 30 41 8b 47 18 83 f8 ff 0f 85 10 ff ff RIP [<ffffffff811a806a>] free_pcppages_bulk+0x52a/0x6f0 RSP <ffff88007a117d28> ---[ end trace 53926436e76d1f35 ]--- When soft offline successfully migrates page, the source page is supposed to be freed. But there is a race condition where a source page looks isolated (i.e. the refcount is 0 and the PageHWPoison is set) but somewhat linked to pcplist. Then another soft offline event calls drain_all_pages() and tries to free such hwpoisoned page, which is forbidden. This odd page state seems to happen due to the race between put_page() in putback_lru_page() and __pagevec_lru_add_fn(). But I don't want to play with tweaking drain code as done in commit 9ab3b59 "mm: hwpoison: drop lru_add_drain_all() in __soft_offline_page()", or to change page freeing code for this soft offline's purpose. Instead, let's think about the difference between hard offline and soft offline. There is an interesting difference in how to isolate the in-use page between these, that is, hard offline marks PageHWPoison of the target page at first, and doesn't free it by keeping its refcount 1. OTOH, soft offline tries to free the target page then marks PageHWPoison. This difference might be the source of complexity and result in bugs like the above. So making soft offline isolate with keeping refcount can be a solution for this problem. We can pass to page migration code the "reason" which shows the caller, so let's use this more to avoid calling putback_lru_page() when called from soft offline, which effectively does the isolation for soft offline. With this change, target pages of soft offline never be reused without changing migratetype, so this patch also removes the related code. Signed-off-by: Naoya Horiguchi <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Tony Luck <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

[ Upstream commit 5ec0811 ] When the first propgated copy was a slave the following oops would result: > BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 > IP: [<ffffffff811fba4e>] propagate_one+0xbe/0x1c0 > PGD bacd4067 PUD bac66067 PMD 0 > Oops: 0000 [#1] SMP > Modules linked in: > CPU: 1 PID: 824 Comm: mount Not tainted 4.6.0-rc5userns+ #1523 > Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007 > task: ffff8800bb0a8000 ti: ffff8800bac3c000 task.ti: ffff8800bac3c000 > RIP: 0010:[<ffffffff811fba4e>] [<ffffffff811fba4e>] propagate_one+0xbe/0x1c0 > RSP: 0018:ffff8800bac3fd38 EFLAGS: 00010283 > RAX: 0000000000000000 RBX: ffff8800bb77ec00 RCX: 0000000000000010 > RDX: 0000000000000000 RSI: ffff8800bb58c000 RDI: ffff8800bb58c480 > RBP: ffff8800bac3fd48 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000001ca1 R11: 0000000000001c9d R12: 0000000000000000 > R13: ffff8800ba713800 R14: ffff8800bac3fda0 R15: ffff8800bb77ec00 > FS: 00007f3c0cd9b7e0(0000) GS:ffff8800bfb00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000010 CR3: 00000000bb79d000 CR4: 00000000000006e0 > Stack: > ffff8800bb77ec00 0000000000000000 ffff8800bac3fd88 ffffffff811fbf85 > ffff8800bac3fd98 ffff8800bb77f080 ffff8800ba713800 ffff8800bb262b40 > 0000000000000000 0000000000000000 ffff8800bac3fdd8 ffffffff811f1da0 > Call Trace: > [<ffffffff811fbf85>] propagate_mnt+0x105/0x140 > [<ffffffff811f1da0>] attach_recursive_mnt+0x120/0x1e0 > [<ffffffff811f1ec3>] graft_tree+0x63/0x70 > [<ffffffff811f1f6b>] do_add_mount+0x9b/0x100 > [<ffffffff811f2c1a>] do_mount+0x2aa/0xdf0 > [<ffffffff8117efbe>] ? strndup_user+0x4e/0x70 > [<ffffffff811f3a45>] SyS_mount+0x75/0xc0 > [<ffffffff8100242b>] do_syscall_64+0x4b/0xa0 > [<ffffffff81988f3c>] entry_SYSCALL64_slow_path+0x25/0x25 > Code: 00 00 75 ec 48 89 0d 02 22 22 01 8b 89 10 01 00 00 48 89 05 fd 21 22 01 39 8e 10 01 00 00 0f 84 e0 00 00 00 48 8b 80 d8 00 00 00 <48> 8b 50 10 48 89 05 df 21 22 01 48 89 15 d0 21 22 01 8b 53 30 > RIP [<ffffffff811fba4e>] propagate_one+0xbe/0x1c0 > RSP <ffff8800bac3fd38> > CR2: 0000000000000010 > ---[ end trace 2725ecd95164f217 ]--- This oops happens with the namespace_sem held and can be triggered by non-root users. An all around not pleasant experience. To avoid this scenario when finding the appropriate source mount to copy stop the walk up the mnt_master chain when the first source mount is encountered. Further rewrite the walk up the last_source mnt_master chain so that it is clear what is going on. The reason why the first source mount is special is that it it's mnt_parent is not a mount in the dest_mnt propagation tree, and as such termination conditions based up on the dest_mnt mount propgation tree do not make sense. To avoid other kinds of confusion last_dest is not changed when computing last_source. last_dest is only used once in propagate_one and that is above the point of the code being modified, so changing the global variable is meaningless and confusing. Cc: [email protected] fixes: f2ebb3a ("smarter propagate_mnt()") Reported-by: Tycho Andersen <[email protected]> Reviewed-by: Seth Forshee <[email protected]> Tested-by: Seth Forshee <[email protected]> Signed-off-by: "Eric W. Biederman" <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

[ Upstream commit 6ae645d ] NULL pointer derefence happens when booting with DTB because the platform data for haptic device is not set in supplied data from parent MFD device. The MFD device creates only platform data (from Device Tree) for itself, not for haptic child. Unable to handle kernel NULL pointer dereference at virtual address 0000009c pgd = c0004000 [0000009c] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM (max8997_haptic_probe) from [<c03f9cec>] (platform_drv_probe+0x4c/0xb0) (platform_drv_probe) from [<c03f8440>] (driver_probe_device+0x214/0x2c0) (driver_probe_device) from [<c03f8598>] (__driver_attach+0xac/0xb0) (__driver_attach) from [<c03f67ac>] (bus_for_each_dev+0x68/0x9c) (bus_for_each_dev) from [<c03f7a38>] (bus_add_driver+0x1a0/0x218) (bus_add_driver) from [<c03f8db0>] (driver_register+0x78/0xf8) (driver_register) from [<c0101774>] (do_one_initcall+0x90/0x1d8) (do_one_initcall) from [<c0a00dbc>] (kernel_init_freeable+0x15c/0x1fc) (kernel_init_freeable) from [<c06bb5b4>] (kernel_init+0x8/0x114) (kernel_init) from [<c0107938>] (ret_from_fork+0x14/0x3c) Signed-off-by: Marek Szyprowski <[email protected]> Cc: <[email protected]> Fixes: 104594b ("Input: add driver support for MAX8997-haptic") [k.kozlowski: Write commit message, add CC-stable] Signed-off-by: Krzysztof Kozlowski <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]> Signed-off-by: Sasha Levin <[email protected]>

commit bc4ef75 upstream. The value of ctx->pos in the last readdir call is supposed to be set to INT_MAX due to 32bit compatibility, unless 'pos' is intentially set to a larger value, then it's LLONG_MAX. There's a report from PaX SIZE_OVERFLOW plugin that "ctx->pos++" overflows (https://forums.grsecurity.net/viewtopic.php?f=1&t=4284), on a 64bit arch, where the value is 0x7fffffffffffffff ie. LLONG_MAX before the increment. We can get to that situation like that: * emit all regular readdir entries * still in the same call to readdir, bump the last pos to INT_MAX * next call to readdir will not emit any entries, but will reach the bump code again, finds pos to be INT_MAX and sets it to LLONG_MAX Normally this is not a problem, but if we call readdir again, we'll find 'pos' set to LLONG_MAX and the unconditional increment will overflow. The report from Victor at (http://thread.gmane.org/gmane.comp.file-systems.btrfs/49500) with debugging print shows that pattern: Overflow: e Overflow: 7fffffff Overflow: 7fffffffffffffff PAX: size overflow detected in function btrfs_real_readdir fs/btrfs/inode.c:5760 cicus.935_282 max, count: 9, decl: pos; num: 0; context: dir_context; CPU: 0 PID: 2630 Comm: polkitd Not tainted 4.2.3-grsec #1 Hardware name: Gigabyte Technology Co., Ltd. H81ND2H/H81ND2H, BIOS F3 08/11/2015 ffffffff81901608 0000000000000000 ffffffff819015e6 ffffc90004973d48 ffffffff81742f0f 0000000000000007 ffffffff81901608 ffffc90004973d78 ffffffff811cb706 0000000000000000 ffff8800d47359e0 ffffc90004973ed8 Call Trace: [<ffffffff81742f0f>] dump_stack+0x4c/0x7f [<ffffffff811cb706>] report_size_overflow+0x36/0x40 [<ffffffff812ef0bc>] btrfs_real_readdir+0x69c/0x6d0 [<ffffffff811dafc8>] iterate_dir+0xa8/0x150 [<ffffffff811e6d8d>] ? __fget_light+0x2d/0x70 [<ffffffff811dba3a>] SyS_getdents+0xba/0x1c0 Overflow: 1a [<ffffffff811db070>] ? iterate_dir+0x150/0x150 [<ffffffff81749b69>] entry_SYSCALL_64_fastpath+0x12/0x83 The jump from 7fffffff to 7fffffffffffffff happens when new dir entries are not yet synced and are processed from the delayed list. Then the code could go to the bump section again even though it might not emit any new dir entries from the delayed list. The fix avoids entering the "bump" section again once we've finished emitting the entries, both for synced and delayed entries. References: https://forums.grsecurity.net/viewtopic.php?f=1&t=4284 Reported-by: Victor <[email protected]> Signed-off-by: David Sterba <[email protected]> Tested-by: Holger Hoffstätte <[email protected]> Signed-off-by: Chris Mason <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 0c0fe3b upstream. While doing some tests I ran into an hang on an extent buffer's rwlock that produced the following trace: [39389.800012] NMI watchdog: BUG: soft lockup - CPU#15 stuck for 22s! [fdm-stress:32166] [39389.800016] NMI watchdog: BUG: soft lockup - CPU#14 stuck for 22s! [fdm-stress:32165] [39389.800016] Modules linked in: btrfs dm_mod ppdev xor sha256_generic hmac raid6_pq drbg ansi_cprng aesni_intel i2c_piix4 acpi_cpufreq aes_x86_64 ablk_helper tpm_tis parport_pc i2c_core sg cryptd evdev psmouse lrw tpm parport gf128mul serio_raw pcspkr glue_helper processor button loop autofs4 ext4 crc16 mbcache jbd2 sd_mod sr_mod cdrom ata_generic virtio_scsi ata_piix libata virtio_pci virtio_ring crc32c_intel scsi_mod e1000 virtio floppy [last unloaded: btrfs] [39389.800016] irq event stamp: 0 [39389.800016] hardirqs last enabled at (0): [< (null)>] (null) [39389.800016] hardirqs last disabled at (0): [<ffffffff8104e58d>] copy_process+0x638/0x1a35 [39389.800016] softirqs last enabled at (0): [<ffffffff8104e58d>] copy_process+0x638/0x1a35 [39389.800016] softirqs last disabled at (0): [< (null)>] (null) [39389.800016] CPU: 14 PID: 32165 Comm: fdm-stress Not tainted 4.4.0-rc6-btrfs-next-18+ #1 [39389.800016] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS by qemu-project.org 04/01/2014 [39389.800016] task: ffff880175b1ca40 ti: ffff8800a185c000 task.ti: ffff8800a185c000 [39389.800016] RIP: 0010:[<ffffffff810902af>] [<ffffffff810902af>] queued_spin_lock_slowpath+0x57/0x158 [39389.800016] RSP: 0018:ffff8800a185fb80 EFLAGS: 00000202 [39389.800016] RAX: 0000000000000101 RBX: ffff8801710c4e9c RCX: 0000000000000101 [39389.800016] RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000001 [39389.800016] RBP: ffff8800a185fb98 R08: 0000000000000001 R09: 0000000000000000 [39389.800016] R10: ffff8800a185fb68 R11: 6db6db6db6db6db7 R12: ffff8801710c4e98 [39389.800016] R13: ffff880175b1ca40 R14: ffff8800a185fc10 R15: ffff880175b1ca40 [39389.800016] FS: 00007f6d37fff700(0000) GS:ffff8802be9c0000(0000) knlGS:0000000000000000 [39389.800016] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [39389.800016] CR2: 00007f6d300019b8 CR3: 0000000037c93000 CR4: 00000000001406e0 [39389.800016] Stack: [39389.800016] ffff8801710c4e98 ffff8801710c4e98 ffff880175b1ca40 ffff8800a185fbb0 [39389.800016] ffffffff81091e11 ffff8801710c4e98 ffff8800a185fbc8 ffffffff81091895 [39389.800016] ffff8801710c4e98 ffff8800a185fbe8 ffffffff81486c5c ffffffffa067288c [39389.800016] Call Trace: [39389.800016] [<ffffffff81091e11>] queued_read_lock_slowpath+0x46/0x60 [39389.800016] [<ffffffff81091895>] do_raw_read_lock+0x3e/0x41 [39389.800016] [<ffffffff81486c5c>] _raw_read_lock+0x3d/0x44 [39389.800016] [<ffffffffa067288c>] ? btrfs_tree_read_lock+0x54/0x125 [btrfs] [39389.800016] [<ffffffffa067288c>] btrfs_tree_read_lock+0x54/0x125 [btrfs] [39389.800016] [<ffffffffa0622ced>] ? btrfs_find_item+0xa7/0xd2 [btrfs] [39389.800016] [<ffffffffa069363f>] btrfs_ref_to_path+0xd6/0x174 [btrfs] [39389.800016] [<ffffffffa0693730>] inode_to_path+0x53/0xa2 [btrfs] [39389.800016] [<ffffffffa0693e2e>] paths_from_inode+0x117/0x2ec [btrfs] [39389.800016] [<ffffffffa0670cff>] btrfs_ioctl+0xd5b/0x2793 [btrfs] [39389.800016] [<ffffffff8108a8b0>] ? arch_local_irq_save+0x9/0xc [39389.800016] [<ffffffff81276727>] ? __this_cpu_preempt_check+0x13/0x15 [39389.800016] [<ffffffff8108a8b0>] ? arch_local_irq_save+0x9/0xc [39389.800016] [<ffffffff8118b3d4>] ? rcu_read_unlock+0x3e/0x5d [39389.800016] [<ffffffff811822f8>] do_vfs_ioctl+0x42b/0x4ea [39389.800016] [<ffffffff8118b4f3>] ? __fget_light+0x62/0x71 [39389.800016] [<ffffffff8118240e>] SyS_ioctl+0x57/0x79 [39389.800016] [<ffffffff814872d7>] entry_SYSCALL_64_fastpath+0x12/0x6f [39389.800016] Code: b9 01 01 00 00 f7 c6 00 ff ff ff 75 32 83 fe 01 89 ca 89 f0 0f 45 d7 f0 0f b1 13 39 f0 74 04 89 c6 eb e2 ff ca 0f 84 fa 00 00 00 <8b> 03 84 c0 74 04 f3 90 eb f6 66 c7 03 01 00 e9 e6 00 00 00 e8 [39389.800012] Modules linked in: btrfs dm_mod ppdev xor sha256_generic hmac raid6_pq drbg ansi_cprng aesni_intel i2c_piix4 acpi_cpufreq aes_x86_64 ablk_helper tpm_tis parport_pc i2c_core sg cryptd evdev psmouse lrw tpm parport gf128mul serio_raw pcspkr glue_helper processor button loop autofs4 ext4 crc16 mbcache jbd2 sd_mod sr_mod cdrom ata_generic virtio_scsi ata_piix libata virtio_pci virtio_ring crc32c_intel scsi_mod e1000 virtio floppy [last unloaded: btrfs] [39389.800012] irq event stamp: 0 [39389.800012] hardirqs last enabled at (0): [< (null)>] (null) [39389.800012] hardirqs last disabled at (0): [<ffffffff8104e58d>] copy_process+0x638/0x1a35 [39389.800012] softirqs last enabled at (0): [<ffffffff8104e58d>] copy_process+0x638/0x1a35 [39389.800012] softirqs last disabled at (0): [< (null)>] (null) [39389.800012] CPU: 15 PID: 32166 Comm: fdm-stress Tainted: G L 4.4.0-rc6-btrfs-next-18+ #1 [39389.800012] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS by qemu-project.org 04/01/2014 [39389.800012] task: ffff880179294380 ti: ffff880034a60000 task.ti: ffff880034a60000 [39389.800012] RIP: 0010:[<ffffffff81091e8d>] [<ffffffff81091e8d>] queued_write_lock_slowpath+0x62/0x72 [39389.800012] RSP: 0018:ffff880034a639f0 EFLAGS: 00000206 [39389.800012] RAX: 0000000000000101 RBX: ffff8801710c4e98 RCX: 0000000000000000 [39389.800012] RDX: 00000000000000ff RSI: 0000000000000000 RDI: ffff8801710c4e9c [39389.800012] RBP: ffff880034a639f8 R08: 0000000000000001 R09: 0000000000000000 [39389.800012] R10: ffff880034a639b0 R11: 0000000000001000 R12: ffff8801710c4e98 [39389.800012] R13: 0000000000000001 R14: ffff880172cbc000 R15: ffff8801710c4e00 [39389.800012] FS: 00007f6d377fe700(0000) GS:ffff8802be9e0000(0000) knlGS:0000000000000000 [39389.800012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [39389.800012] CR2: 00007f6d3d3c1000 CR3: 0000000037c93000 CR4: 00000000001406e0 [39389.800012] Stack: [39389.800012] ffff8801710c4e98 ffff880034a63a10 ffffffff81091963 ffff8801710c4e98 [39389.800012] ffff880034a63a30 ffffffff81486f1b ffffffffa0672cb3 ffff8801710c4e00 [39389.800012] ffff880034a63a78 ffffffffa0672cb3 ffff8801710c4e00 ffff880034a63a58 [39389.800012] Call Trace: [39389.800012] [<ffffffff81091963>] do_raw_write_lock+0x72/0x8c [39389.800012] [<ffffffff81486f1b>] _raw_write_lock+0x3a/0x41 [39389.800012] [<ffffffffa0672cb3>] ? btrfs_tree_lock+0x119/0x251 [btrfs] [39389.800012] [<ffffffffa0672cb3>] btrfs_tree_lock+0x119/0x251 [btrfs] [39389.800012] [<ffffffffa061aeba>] ? rcu_read_unlock+0x5b/0x5d [btrfs] [39389.800012] [<ffffffffa061ce13>] ? btrfs_root_node+0xda/0xe6 [btrfs] [39389.800012] [<ffffffffa061ce83>] btrfs_lock_root_node+0x22/0x42 [btrfs] [39389.800012] [<ffffffffa062046b>] btrfs_search_slot+0x1b8/0x758 [btrfs] [39389.800012] [<ffffffff810fc6b0>] ? time_hardirqs_on+0x15/0x28 [39389.800012] [<ffffffffa06365db>] btrfs_lookup_inode+0x31/0x95 [btrfs] [39389.800012] [<ffffffff8108d62f>] ? trace_hardirqs_on+0xd/0xf [39389.800012] [<ffffffff8148482b>] ? mutex_lock_nested+0x397/0x3bc [39389.800012] [<ffffffffa068821b>] __btrfs_update_delayed_inode+0x59/0x1c0 [btrfs] [39389.800012] [<ffffffffa068858e>] __btrfs_commit_inode_delayed_items+0x194/0x5aa [btrfs] [39389.800012] [<ffffffff81486ab7>] ? _raw_spin_unlock+0x31/0x44 [39389.800012] [<ffffffffa0688a48>] __btrfs_run_delayed_items+0xa4/0x15c [btrfs] [39389.800012] [<ffffffffa0688d62>] btrfs_run_delayed_items+0x11/0x13 [btrfs] [39389.800012] [<ffffffffa064048e>] btrfs_commit_transaction+0x234/0x96e [btrfs] [39389.800012] [<ffffffffa0618d10>] btrfs_sync_fs+0x145/0x1ad [btrfs] [39389.800012] [<ffffffffa0671176>] btrfs_ioctl+0x11d2/0x2793 [btrfs] [39389.800012] [<ffffffff8108a8b0>] ? arch_local_irq_save+0x9/0xc [39389.800012] [<ffffffff81140261>] ? __might_fault+0x4c/0xa7 [39389.800012] [<ffffffff81140261>] ? __might_fault+0x4c/0xa7 [39389.800012] [<ffffffff8108a8b0>] ? arch_local_irq_save+0x9/0xc [39389.800012] [<ffffffff8118b3d4>] ? rcu_read_unlock+0x3e/0x5d [39389.800012] [<ffffffff811822f8>] do_vfs_ioctl+0x42b/0x4ea [39389.800012] [<ffffffff8118b4f3>] ? __fget_light+0x62/0x71 [39389.800012] [<ffffffff8118240e>] SyS_ioctl+0x57/0x79 [39389.800012] [<ffffffff814872d7>] entry_SYSCALL_64_fastpath+0x12/0x6f [39389.800012] Code: f0 0f b1 13 85 c0 75 ef eb 2a f3 90 8a 03 84 c0 75 f8 f0 0f b0 13 84 c0 75 f0 ba ff 00 00 00 eb 0a f0 0f b1 13 ff c8 74 0b f3 90 <8b> 03 83 f8 01 75 f7 eb ed c6 43 04 00 5b 5d c3 0f 1f 44 00 00 This happens because in the code path executed by the inode_paths ioctl we end up nesting two calls to read lock a leaf's rwlock when after the first call to read_lock() and before the second call to read_lock(), another task (running the delayed items as part of a transaction commit) has already called write_lock() against the leaf's rwlock. This situation is illustrated by the following diagram: Task A Task B btrfs_ref_to_path() btrfs_commit_transaction() read_lock(&eb->lock); btrfs_run_delayed_items() __btrfs_commit_inode_delayed_items() __btrfs_update_delayed_inode() btrfs_lookup_inode() write_lock(&eb->lock); --> task waits for lock read_lock(&eb->lock); --> makes this task hang forever (and task B too of course) So fix this by avoiding doing the nested read lock, which is easily avoidable. This issue does not happen if task B calls write_lock() after task A does the second call to read_lock(), however there does not seem to exist anything in the documentation that mentions what is the expected behaviour for recursive locking of rwlocks (leaving the idea that doing so is not a good usage of rwlocks). Also, as a side effect necessary for this fix, make sure we do not needlessly read lock extent buffers when the input path has skip_locking set (used when called from send). Signed-off-by: Filipe Manana <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 90a88d6 upstream. This softlockup is currently happening: [ 444.088002] NMI watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [kworker/1:1:29] [ 444.088002] Modules linked in: lpfc(-) qla2x00tgt(O) qla2xxx_scst(O) scst_vdisk(O) scsi_transport_fc libcrc32c scst(O) dlm configfs nfsd lockd grace nfs_acl auth_rpcgss sunrpc ed d snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device dm_mod iTCO_wdt snd_hda_codec_realtek snd_hda_codec_generic gpio_ich iTCO_vendor_support ppdev snd_hda_intel snd_hda_codec snd_hda _core snd_hwdep tg3 snd_pcm snd_timer libphy lpc_ich parport_pc ptp acpi_cpufreq snd pps_core fjes parport i2c_i801 ehci_pci tpm_tis tpm sr_mod cdrom soundcore floppy hwmon sg 8250_ fintek pcspkr i915 drm_kms_helper uhci_hcd ehci_hcd drm fb_sys_fops sysimgblt sysfillrect syscopyarea i2c_algo_bit usbcore button video usb_common fan ata_generic ata_piix libata th ermal [ 444.088002] CPU: 1 PID: 29 Comm: kworker/1:1 Tainted: G O 4.4.0-rc5-2.g1e923a3-default #1 [ 444.088002] Hardware name: FUJITSU SIEMENS ESPRIMO E /D2164-A1, BIOS 5.00 R1.10.2164.A1 05/08/2006 [ 444.088002] Workqueue: fc_wq_4 fc_rport_final_delete [scsi_transport_fc] [ 444.088002] task: f6266ec0 ti: f6268000 task.ti: f6268000 [ 444.088002] EIP: 0060:[<c07e7044>] EFLAGS: 00000286 CPU: 1 [ 444.088002] EIP is at _raw_spin_unlock_irqrestore+0x14/0x20 [ 444.088002] EAX: 00000286 EBX: f20d3800 ECX: 00000002 EDX: 00000286 [ 444.088002] ESI: f50ba800 EDI: f2146848 EBP: f6269ec8 ESP: f6269ec8 [ 444.088002] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 444.088002] CR0: 8005003b CR2: 08f96600 CR3: 363ae000 CR4: 000006d0 [ 444.088002] Stack: [ 444.088002] f6269eec c066b0f7 00000286 f2146848 f50ba808 f50ba800 f50ba800 f2146a90 [ 444.088002] f2146848 f6269f08 f8f0a4ed f3141000 f2146800 f2146a90 f619fa00 00000040 [ 444.088002] f6269f40 c026cb25 00000001 166c6392 00000061 f6757140 f6136340 00000004 [ 444.088002] Call Trace: [ 444.088002] [<c066b0f7>] scsi_remove_target+0x167/0x1c0 [ 444.088002] [<f8f0a4ed>] fc_rport_final_delete+0x9d/0x1e0 [scsi_transport_fc] [ 444.088002] [<c026cb25>] process_one_work+0x155/0x3e0 [ 444.088002] [<c026cde7>] worker_thread+0x37/0x490 [ 444.088002] [<c027214b>] kthread+0x9b/0xb0 [ 444.088002] [<c07e72c1>] ret_from_kernel_thread+0x21/0x40 What appears to be happening is that something has pinned the target so it can't go into STARGET_DEL via final release and the loop in scsi_remove_target spins endlessly until that happens. The fix for this soft lockup is to not keep looping over a device that we've called remove on but which hasn't gone into DEL state. This patch will retain a simplistic memory of the last target and not keep looping over it. Reported-by: Sebastian Herbszt <[email protected]> Tested-by: Sebastian Herbszt <[email protected]> Fixes: 4099819 Signed-off-by: James Bottomley <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 361cad3 upstream. We've seen this in a packet capture - I've intermixed what I think was going on. The fix here is to grab the so_lock sooner. 1964379 -> #1 open (for write) reply seqid=1 1964393 -> #2 open (for read) reply seqid=2 __nfs4_close(), state->n_wronly-- nfs4_state_set_mode_locked(), changes state->state = [R] state->flags is [RW] state->state is [R], state->n_wronly == 0, state->n_rdonly == 1 1964398 -> #3 open (for write) call -> because close is already running 1964399 -> downgrade (to read) call seqid=2 (close of #1) 1964402 -> #3 open (for write) reply seqid=3 __update_open_stateid() nfs_set_open_stateid_locked(), changes state->flags state->flags is [RW] state->state is [R], state->n_wronly == 0, state->n_rdonly == 1 new sequence number is exposed now via nfs4_stateid_copy() next step would be update_open_stateflags(), pending so_lock 1964403 -> downgrade reply seqid=2, fails with OLD_STATEID (close of #1) nfs4_close_prepare() gets so_lock and recalcs flags -> send close 1964405 -> downgrade (to read) call seqid=3 (close of #1 retry) __update_open_stateid() gets so_lock * update_open_stateflags() updates state->n_wronly. nfs4_state_set_mode_locked() updates state->state state->flags is [RW] state->state is [RW], state->n_wronly == 1, state->n_rdonly == 1 * should have suppressed the preceding nfs4_close_prepare() from sending open_downgrade 1964406 -> write call 1964408 -> downgrade (to read) reply seqid=4 (close of #1 retry) nfs_clear_open_stateid_locked() state->flags is [R] state->state is [RW], state->n_wronly == 1, state->n_rdonly == 1 1964409 -> write reply (fails, openmode) Signed-off-by: Andrew Elble <[email protected]> Signed-off-by: Trond Myklebust <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit d96b339 upstream. I saw the following BUG_ON triggered in a testcase where a process calls madvise(MADV_SOFT_OFFLINE) on thps, along with a background process that calls migratepages command repeatedly (doing ping-pong among different NUMA nodes) for the first process: Soft offlining page 0x60000 at 0x700000600000 __get_any_page: 0x60000 free buddy page page:ffffea0001800000 count:0 mapcount:-127 mapping: (null) index:0x1 flags: 0x1fffc0000000000() page dumped because: VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0) ------------[ cut here ]------------ kernel BUG at /src/linux-dev/include/linux/mm.h:342! invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC Modules linked in: cfg80211 rfkill crc32c_intel serio_raw virtio_balloon i2c_piix4 virtio_blk virtio_net ata_generic pata_acpi CPU: 3 PID: 3035 Comm: test_alloc_gene Tainted: G O 4.4.0-rc8-v4.4-rc8-160107-1501-00000-rc8+ #74 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 task: ffff88007c63d5c0 ti: ffff88007c210000 task.ti: ffff88007c210000 RIP: 0010:[<ffffffff8118998c>] [<ffffffff8118998c>] put_page+0x5c/0x60 RSP: 0018:ffff88007c213e00 EFLAGS: 00010246 Call Trace: put_hwpoison_page+0x4e/0x80 soft_offline_page+0x501/0x520 SyS_madvise+0x6bc/0x6f0 entry_SYSCALL_64_fastpath+0x12/0x6a Code: 8b fc ff ff 5b 5d c3 48 89 df e8 b0 fa ff ff 48 89 df 31 f6 e8 c6 7d ff ff 5b 5d c3 48 c7 c6 08 54 a2 81 48 89 df e8 a4 c5 01 00 <0f> 0b 66 90 66 66 66 66 90 55 48 89 e5 41 55 41 54 53 48 8b 47 RIP [<ffffffff8118998c>] put_page+0x5c/0x60 RSP <ffff88007c213e00> The root cause resides in get_any_page() which retries to get a refcount of the page to be soft-offlined. This function calls put_hwpoison_page(), expecting that the target page is putback to LRU list. But it can be also freed to buddy. So the second check need to care about such case. Fixes: af8fae7 ("mm/memory-failure.c: clean up soft_offline_page()") Signed-off-by: Naoya Horiguchi <[email protected]> Cc: Sasha Levin <[email protected]> Cc: Aneesh Kumar K.V <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Jerome Marchand <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Steve Capper <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: David Rientjes <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

…vice commit fecaee6 upstream. This bug can be reproduced by the following script: #!/bin/bash bcache_sysfs="/sys/fs/bcache" function clear_cache() { if [ ! -e $bcache_sysfs ]; then echo "no bcache sysfs" exit fi cset_uuid=$(ls -l $bcache_sysfs|head -n 2|tail -n 1|awk '{print $9}') sudo sh -c "echo $cset_uuid > /sys/block/sdb/sdb1/bcache/detach" sleep 5 sudo sh -c "echo $cset_uuid > /sys/block/sdb/sdb1/bcache/attach" } for ((i=0;i<10;i++)); do clear_cache done The warning messages look like below: [ 275.948611] ------------[ cut here ]------------ [ 275.963840] WARNING: at fs/sysfs/dir.c:512 sysfs_add_one+0xb8/0xd0() (Tainted: P W --------------- ) [ 275.979253] Hardware name: Tecal RH2285 [ 275.994106] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:09.0/0000:08:00.0/host4/target4:2:1/4:2:1:0/block/sdb/sdb1/bcache/cache' [ 276.024105] Modules linked in: bcache tcp_diag inet_diag ipmi_devintf ipmi_si ipmi_msghandler bonding 8021q garp stp llc ipv6 ext3 jbd loop sg iomemory_vsl(P) bnx2 microcode serio_raw i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support i7core_edac edac_core shpchp ext4 jbd2 mbcache megaraid_sas pata_acpi ata_generic ata_piix dm_mod [last unloaded: scsi_wait_scan] [ 276.072643] Pid: 2765, comm: sh Tainted: P W --------------- 2.6.32 #1 [ 276.089315] Call Trace: [ 276.105801] [<ffffffff81070fe7>] ? warn_slowpath_common+0x87/0xc0 [ 276.122650] [<ffffffff810710d6>] ? warn_slowpath_fmt+0x46/0x50 [ 276.139361] [<ffffffff81205c08>] ? sysfs_add_one+0xb8/0xd0 [ 276.156012] [<ffffffff8120609b>] ? sysfs_do_create_link+0x12b/0x170 [ 276.172682] [<ffffffff81206113>] ? sysfs_create_link+0x13/0x20 [ 276.189282] [<ffffffffa03bda21>] ? bcache_device_link+0xc1/0x110 [bcache] [ 276.205993] [<ffffffffa03bfa08>] ? bch_cached_dev_attach+0x478/0x4f0 [bcache] [ 276.222794] [<ffffffffa03c4a17>] ? bch_cached_dev_store+0x627/0x780 [bcache] [ 276.239680] [<ffffffff8116783a>] ? alloc_pages_current+0xaa/0x110 [ 276.256594] [<ffffffff81203b15>] ? sysfs_write_file+0xe5/0x170 [ 276.273364] [<ffffffff811887b8>] ? vfs_write+0xb8/0x1a0 [ 276.290133] [<ffffffff811890b1>] ? sys_write+0x51/0x90 [ 276.306368] [<ffffffff8100c072>] ? system_call_fastpath+0x16/0x1b [ 276.322301] ---[ end trace 9f5d4fcdd0c3edfb ]--- [ 276.338241] ------------[ cut here ]------------ [ 276.354109] WARNING: at /home/wenqing.lz/bcache/bcache/super.c:720 bcache_device_link+0xdf/0x110 [bcache]() (Tainted: P W --------------- ) [ 276.386017] Hardware name: Tecal RH2285 [ 276.401430] Couldn't create device <-> cache set symlinks [ 276.401759] Modules linked in: bcache tcp_diag inet_diag ipmi_devintf ipmi_si ipmi_msghandler bonding 8021q garp stp llc ipv6 ext3 jbd loop sg iomemory_vsl(P) bnx2 microcode serio_raw i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support i7core_edac edac_core shpchp ext4 jbd2 mbcache megaraid_sas pata_acpi ata_generic ata_piix dm_mod [last unloaded: scsi_wait_scan] [ 276.465477] Pid: 2765, comm: sh Tainted: P W --------------- 2.6.32 #1 [ 276.482169] Call Trace: [ 276.498610] [<ffffffff81070fe7>] ? warn_slowpath_common+0x87/0xc0 [ 276.515405] [<ffffffff810710d6>] ? warn_slowpath_fmt+0x46/0x50 [ 276.532059] [<ffffffffa03bda3f>] ? bcache_device_link+0xdf/0x110 [bcache] [ 276.548808] [<ffffffffa03bfa08>] ? bch_cached_dev_attach+0x478/0x4f0 [bcache] [ 276.565569] [<ffffffffa03c4a17>] ? bch_cached_dev_store+0x627/0x780 [bcache] [ 276.582418] [<ffffffff8116783a>] ? alloc_pages_current+0xaa/0x110 [ 276.599341] [<ffffffff81203b15>] ? sysfs_write_file+0xe5/0x170 [ 276.616142] [<ffffffff811887b8>] ? vfs_write+0xb8/0x1a0 [ 276.632607] [<ffffffff811890b1>] ? sys_write+0x51/0x90 [ 276.648671] [<ffffffff8100c072>] ? system_call_fastpath+0x16/0x1b [ 276.664756] ---[ end trace 9f5d4fcdd0c3edfc ]--- We forget to clear BCACHE_DEV_UNLINK_DONE flag in bcache_device_attach() function when we attach a backing device first time. After detaching this backing device, this flag will be true and sysfs_remove_link() isn't called in bcache_device_unlink(). Then when we attach this backing device again, sysfs_create_link() will return EEXIST error in bcache_device_link(). So the fix is trival and we clear this flag in bcache_device_link(). Signed-off-by: Zheng Liu <[email protected]> Tested-by: Joshua Schmid <[email protected]> Tested-by: Eric Wheeler <[email protected]> Cc: Kent Overstreet <[email protected]> Signed-off-by: Jens Axboe <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 7f98ca4 upstream. We apparantly get a hotplug irq before we've initialised modesetting, [drm] Loading R100 Microcode BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<c125f56f>] __mutex_lock_slowpath+0x23/0x91 *pde = 00000000 Oops: 0002 [#1] Modules linked in: radeon(+) drm_kms_helper ttm drm i2c_algo_bit backlight pcspkr psmouse evdev sr_mod input_leds led_class cdrom sg parport_pc parport floppy intel_agp intel_gtt lpc_ich acpi_cpufreq processor button mfd_core agpgart uhci_hcd ehci_hcd rng_core snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm usbcore usb_common i2c_i801 i2c_core snd_timer snd soundcore thermal_sys CPU: 0 PID: 15 Comm: kworker/0:1 Not tainted 4.2.0-rc7-00015-gbf67402 #111 Hardware name: MicroLink /D850MV , BIOS MV85010A.86A.0067.P24.0304081124 04/08/2003 Workqueue: events radeon_hotplug_work_func [radeon] task: f6ca5900 ti: f6d3e000 task.ti: f6d3e000 EIP: 0060:[<c125f56f>] EFLAGS: 00010282 CPU: 0 EIP is at __mutex_lock_slowpath+0x23/0x91 EAX: 00000000 EBX: f5e900fc ECX: 00000000 EDX: fffffffe ESI: f6ca5900 EDI: f5e90100 EBP: f5e90000 ESP: f6d3ff0c DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 CR0: 8005003b CR2: 00000000 CR3: 36f61000 CR4: 000006d0 Stack: f5e90100 00000000 c103c4c1 f6d2a5a f5e900fc f6df394c c125f162 f8b0faca f6d2a5a c138ca00 f6df394c f7395600 c1034741 00d40000 00000000 f6d2a5a c138ca00 f6d2a5b8 c138ca1 c1034b58 00000001 f6d40000 f6ca5900 f6d0c940 Call Trace: [<c103c4c1>] ? dequeue_task_fair+0xa4/0xb7 [<c125f162>] ? mutex_lock+0x9/0xa [<f8b0faca>] ? radeon_hotplug_work_func+0x17/0x57 [radeon] [<c1034741>] ? process_one_work+0xfc/0x194 [<c1034b58>] ? worker_thread+0x18d/0x218 [<c10349cb>] ? rescuer_thread+0x1d5/0x1d5 [<c103742a>] ? kthread+0x7b/0x80 [<c12601c0>] ? ret_from_kernel_thread+0x20/0x30 [<c10373af>] ? init_completion+0x18/0x18 Code: 42 08 e8 8e a6 dd ff c3 57 56 53 83 ec 0c 8b 35 48 f7 37 c1 8b 10 4a 74 1a 89 c3 8d 78 04 8b 40 08 89 63 Reported-and-Tested-by: Meelis Roos <[email protected]> Signed-off-by: Dave Airlie <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 74e98eb upstream. There was no verification that an underlying transport exists when creating a connection, this would cause dereferencing a NULL ptr. It might happen on sockets that weren't properly bound before attempting to send a message, which will cause a NULL ptr deref: [135546.047719] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN [135546.051270] Modules linked in: [135546.051781] CPU: 4 PID: 15650 Comm: trinity-c4 Not tainted 4.2.0-next-20150902-sasha-00041-gbaa1222-dirty #2527 [135546.053217] task: ffff8800835bc000 ti: ffff8800bc708000 task.ti: ffff8800bc708000 [135546.054291] RIP: __rds_conn_create (net/rds/connection.c:194) [135546.055666] RSP: 0018:ffff8800bc70fab0 EFLAGS: 00010202 [135546.056457] RAX: dffffc0000000000 RBX: 0000000000000f2c RCX: ffff8800835bc000 [135546.057494] RDX: 0000000000000007 RSI: ffff8800835bccd8 RDI: 0000000000000038 [135546.058530] RBP: ffff8800bc70fb18 R08: 0000000000000001 R09: 0000000000000000 [135546.059556] R10: ffffed014d7a3a23 R11: ffffed014d7a3a21 R12: 0000000000000000 [135546.060614] R13: 0000000000000001 R14: ffff8801ec3d0000 R15: 0000000000000000 [135546.061668] FS: 00007faad4ffb700(0000) GS:ffff880252000000(0000) knlGS:0000000000000000 [135546.062836] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [135546.063682] CR2: 000000000000846a CR3: 000000009d137000 CR4: 00000000000006a0 [135546.064723] Stack: [135546.065048] ffffffffafe2055c ffffffffafe23fc1 ffffed00493097bf ffff8801ec3d0008 [135546.066247] 0000000000000000 00000000000000d0 0000000000000000 ac194a24c0586342 [135546.067438] 1ffff100178e1f78 ffff880320581b00 ffff8800bc70fdd0 ffff880320581b00 [135546.068629] Call Trace: [135546.069028] ? __rds_conn_create (include/linux/rcupdate.h:856 net/rds/connection.c:134) [135546.069989] ? rds_message_copy_from_user (net/rds/message.c:298) [135546.071021] rds_conn_create_outgoing (net/rds/connection.c:278) [135546.071981] rds_sendmsg (net/rds/send.c:1058) [135546.072858] ? perf_trace_lock (include/trace/events/lock.h:38) [135546.073744] ? lockdep_init (kernel/locking/lockdep.c:3298) [135546.074577] ? rds_send_drop_to (net/rds/send.c:976) [135546.075508] ? __might_fault (./arch/x86/include/asm/current.h:14 mm/memory.c:3795) [135546.076349] ? __might_fault (mm/memory.c:3795) [135546.077179] ? rds_send_drop_to (net/rds/send.c:976) [135546.078114] sock_sendmsg (net/socket.c:611 net/socket.c:620) [135546.078856] SYSC_sendto (net/socket.c:1657) [135546.079596] ? SYSC_connect (net/socket.c:1628) [135546.080510] ? trace_dump_stack (kernel/trace/trace.c:1926) [135546.081397] ? ring_buffer_unlock_commit (kernel/trace/ring_buffer.c:2479 kernel/trace/ring_buffer.c:2558 kernel/trace/ring_buffer.c:2674) [135546.082390] ? trace_buffer_unlock_commit (kernel/trace/trace.c:1749) [135546.083410] ? trace_event_raw_event_sys_enter (include/trace/events/syscalls.h:16) [135546.084481] ? do_audit_syscall_entry (include/trace/events/syscalls.h:16) [135546.085438] ? trace_buffer_unlock_commit (kernel/trace/trace.c:1749) [135546.085515] rds_ib_laddr_check(): addr 36.74.25.172 ret -99 node type -1 Acked-by: Santosh Shilimkar <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: David S. Miller <[email protected]> Cc: "Charles (Chas) Williams" <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 9f2dfda upstream. An inverted return value check in hostfs_mknod() caused the function to return success after handling it as an error (and cleaning up). It resulted in the following segfault when trying to bind() a named unix socket: Pid: 198, comm: a.out Not tainted 4.4.0-rc4 RIP: 0033:[<0000000061077df6>] RSP: 00000000daae5d60 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 000000006092a460 RCX: 00000000dfc54208 RDX: 0000000061073ef1 RSI: 0000000000000070 RDI: 00000000e027d600 RBP: 00000000daae5de0 R08: 00000000da980ac0 R09: 0000000000000000 R10: 0000000000000003 R11: 00007fb1ae08f72a R12: 0000000000000000 R13: 000000006092a460 R14: 00000000daaa97c0 R15: 00000000daaa9a88 Kernel panic - not syncing: Kernel mode fault at addr 0x40, ip 0x61077df6 CPU: 0 PID: 198 Comm: a.out Not tainted 4.4.0-rc4 #1 Stack: e027d620 dfc54208 0000006f da981398 61bee000 0000c1ed daae5de0 0000006e e027d620 dfcd420 00000005 6092a460 Call Trace: [<60dedc67>] SyS_bind+0xf7/0x110 [<600587be>] handle_syscall+0x7e/0x80 [<60066ad7>] userspace+0x3e7/0x4e0 [<6006321f>] ? save_registers+0x1f/0x40 [<6006c88e>] ? arch_prctl+0x1be/0x1f0 [<60054985>] fork_handler+0x85/0x90 Let's also get rid of the "cosmic ray protection" while we're at it. Fixes: e919305 "hostfs: fix races in dentry_name() and inode_name()" Signed-off-by: Vegard Nossum <[email protected]> Cc: Jeff Dike <[email protected]> Cc: Al Viro <[email protected]> Signed-off-by: Richard Weinberger <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit dcc7fdb upstream. v4l2-compliance sends a zeroed struct v4l2_streamparm in v4l2-test-formats.cpp::testParmType(), and this results in a division by 0 in some gspca subdrivers: divide error: 0000 [#1] SMP Modules linked in: gspca_ov534 gspca_main ... CPU: 0 PID: 17201 Comm: v4l2-compliance Not tainted 4.3.0-rc2-ao2 #1 Hardware name: System manufacturer System Product Name/M2N-E SLI, BIOS ASUS M2N-E SLI ACPI BIOS Revision 1301 09/16/2010 task: ffff8800818306c0 ti: ffff880095c4c000 task.ti: ffff880095c4c000 RIP: 0010:[<ffffffffa079bd62>] [<ffffffffa079bd62>] sd_set_streamparm+0x12/0x60 [gspca_ov534] RSP: 0018:ffff880095c4fce8 EFLAGS: 00010296 RAX: 0000000000000000 RBX: ffff8800c9522000 RCX: ffffffffa077a140 RDX: 0000000000000000 RSI: ffff880095e0c100 RDI: ffff8800c9522000 RBP: ffff880095e0c100 R08: ffffffffa077a100 R09: 00000000000000cc R10: ffff880067ec7740 R11: 0000000000000016 R12: ffffffffa07bb400 R13: 0000000000000000 R14: ffff880081b6a800 R15: 0000000000000000 FS: 00007fda0de78740(0000) GS:ffff88012fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000014630f8 CR3: 00000000cf349000 CR4: 00000000000006f0 Stack: ffffffffa07a6431 ffff8800c9522000 ffffffffa077656e 00000000c0cc5616 ffff8800c9522000 ffffffffa07a5e20 ffff880095e0c100 0000000000000000 ffff880067ec7740 ffffffffa077a140 ffff880067ec7740 0000000000000016 Call Trace: [<ffffffffa07a6431>] ? v4l_s_parm+0x21/0x50 [videodev] [<ffffffffa077656e>] ? vidioc_s_parm+0x4e/0x60 [gspca_main] [<ffffffffa07a5e20>] ? __video_do_ioctl+0x280/0x2f0 [videodev] [<ffffffffa07a5ba0>] ? video_ioctl2+0x20/0x20 [videodev] [<ffffffffa07a59b9>] ? video_usercopy+0x319/0x4e0 [videodev] [<ffffffff81182dc1>] ? page_add_new_anon_rmap+0x71/0xa0 [<ffffffff811afb92>] ? mem_cgroup_commit_charge+0x52/0x90 [<ffffffff81179b18>] ? handle_mm_fault+0xc18/0x1680 [<ffffffffa07a15cc>] ? v4l2_ioctl+0xac/0xd0 [videodev] [<ffffffff811c846f>] ? do_vfs_ioctl+0x28f/0x480 [<ffffffff811c86d4>] ? SyS_ioctl+0x74/0x80 [<ffffffff8154a8b6>] ? entry_SYSCALL_64_fastpath+0x16/0x75 Code: c7 93 d9 79 a0 5b 5d e9 f1 f3 9a e0 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 53 31 d2 48 89 fb 48 83 ec 08 8b 46 10 <f7> 76 0c 80 bf ac 0c 00 00 00 88 87 4e 0e 00 00 74 09 80 bf 4f RIP [<ffffffffa079bd62>] sd_set_streamparm+0x12/0x60 [gspca_ov534] RSP <ffff880095c4fce8> ---[ end trace 279710c2c6c72080 ]--- Following what the doc says about a zeroed timeperframe (see http://www.linuxtv.org/downloads/v4l-dvb-apis/vidioc-g-parm.html): ... To reset manually applications can just set this field to zero. fix the issue by resetting the frame rate to a default value in case of an unusable timeperframe. The fix is done in the subdrivers instead of gspca.c because only the subdrivers have notion of a default frame rate to reset the camera to. Signed-off-by: Antonio Ospite <[email protected]> Reviewed-by: Hans de Goede <[email protected]> Signed-off-by: Hans Verkuil <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit fcd5c4d upstream. EDAC workqueue destruction is really fragile. We cancel delayed work but if it is still running and requeues itself, we still go ahead and destroy the workqueue and the queued work explodes when workqueue core attempts to run it. Make the destruction more robust by switching op_state to offline so that requeuing stops. Cancel any pending work *synchronously* too. EDAC i7core: Driver loaded. general protection fault: 0000 [#1] SMP CPU 12 Modules linked in: Supported: Yes Pid: 0, comm: kworker/0:1 Tainted: G IE 3.0.101-0-default #1 HP ProLiant DL380 G7 RIP: 0010:[<ffffffff8107dcd7>] [<ffffffff8107dcd7>] __queue_work+0x17/0x3f0 < ... regs ...> Process kworker/0:1 (pid: 0, threadinfo ffff88019def6000, task ffff88019def4600) Stack: ... Call Trace: call_timer_fn run_timer_softirq __do_softirq call_softirq do_softirq irq_exit smp_apic_timer_interrupt apic_timer_interrupt intel_idle cpuidle_idle_call cpu_idle Code: ... RIP __queue_work RSP <...> Signed-off-by: Borislav Petkov <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 8eee1d3 upstream. The bulk of ATA host state machine is implemented by ata_sff_hsm_move(). The function is called from either the interrupt handler or, if polling, a work item. Unlike from the interrupt path, the polling path calls the function without holding the host lock and ata_sff_hsm_move() selectively grabs the lock. This is completely broken. If an IRQ triggers while polling is in progress, the two can easily race and end up accessing the hardware and updating state machine state at the same time. This can put the state machine in an illegal state and lead to a crash like the following. kernel BUG at drivers/ata/libata-sff.c:1302! invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN Modules linked in: CPU: 1 PID: 10679 Comm: syz-executor Not tainted 4.5.0-rc1+ #300 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff88002bd00000 ti: ffff88002e048000 task.ti: ffff88002e048000 RIP: 0010:[<ffffffff83a83409>] [<ffffffff83a83409>] ata_sff_hsm_move+0x619/0x1c60 ... Call Trace: <IRQ> [<ffffffff83a84c31>] __ata_sff_port_intr+0x1e1/0x3a0 drivers/ata/libata-sff.c:1584 [<ffffffff83a85611>] ata_bmdma_port_intr+0x71/0x400 drivers/ata/libata-sff.c:2877 [< inline >] __ata_sff_interrupt drivers/ata/libata-sff.c:1629 [<ffffffff83a85bf3>] ata_bmdma_interrupt+0x253/0x580 drivers/ata/libata-sff.c:2902 [<ffffffff81479f98>] handle_irq_event_percpu+0x108/0x7e0 kernel/irq/handle.c:157 [<ffffffff8147a717>] handle_irq_event+0xa7/0x140 kernel/irq/handle.c:205 [<ffffffff81484573>] handle_edge_irq+0x1e3/0x8d0 kernel/irq/chip.c:623 [< inline >] generic_handle_irq_desc include/linux/irqdesc.h:146 [<ffffffff811a92bc>] handle_irq+0x10c/0x2a0 arch/x86/kernel/irq_64.c:78 [<ffffffff811a7e4d>] do_IRQ+0x7d/0x1a0 arch/x86/kernel/irq.c:240 [<ffffffff86653d4c>] common_interrupt+0x8c/0x8c arch/x86/entry/entry_64.S:520 <EOI> [< inline >] rcu_lock_acquire include/linux/rcupdate.h:490 [< inline >] rcu_read_lock include/linux/rcupdate.h:874 [<ffffffff8164b4a1>] filemap_map_pages+0x131/0xba0 mm/filemap.c:2145 [< inline >] do_fault_around mm/memory.c:2943 [< inline >] do_read_fault mm/memory.c:2962 [< inline >] do_fault mm/memory.c:3133 [< inline >] handle_pte_fault mm/memory.c:3308 [< inline >] __handle_mm_fault mm/memory.c:3418 [<ffffffff816efb16>] handle_mm_fault+0x2516/0x49a0 mm/memory.c:3447 [<ffffffff8127dc16>] __do_page_fault+0x376/0x960 arch/x86/mm/fault.c:1238 [<ffffffff8127e358>] trace_do_page_fault+0xe8/0x420 arch/x86/mm/fault.c:1331 [<ffffffff8126f514>] do_async_page_fault+0x14/0xd0 arch/x86/kernel/kvm.c:264 [<ffffffff86655578>] async_page_fault+0x28/0x30 arch/x86/entry/entry_64.S:986 Fix it by ensuring that the polling path is holding the host lock before entering ata_sff_hsm_move() so that all hardware accesses and state updates are performed under the host lock. Signed-off-by: Tejun Heo <[email protected]> Reported-and-tested-by: Dmitry Vyukov <[email protected]> Link: http://lkml.kernel.org/g/CACT4Y+b_JsOxJu2EZyEf+mOXORc_zid5V1-pLZSroJVxyWdSpw@mail.gmail.com Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit 12e2696 upstream. I get the splat below when modprobing/rmmoding EDAC drivers. It happens because bus->name is invalid after bus_unregister() has run. The Code: section below corresponds to: .loc 1 1108 0 movq 672(%rbx), %rax # mci_1(D)->bus, mci_1(D)->bus .loc 1 1109 0 popq %rbx # .loc 1 1108 0 movq (%rax), %rdi # _7->name, jmp kfree # and %rax has some funky stuff 2030203020312030 which looks a lot like something walked over it. Fix that by saving the name ptr before doing stuff to string it points to. general protection fault: 0000 [#1] SMP Modules linked in: ... CPU: 4 PID: 10318 Comm: modprobe Tainted: G I EN 3.12.51-11-default+ #48 Hardware name: HP ProLiant DL380 G7, BIOS P67 05/05/2011 task: ffff880311320280 ti: ffff88030da3e000 task.ti: ffff88030da3e000 RIP: 0010:[<ffffffffa019da92>] [<ffffffffa019da92>] edac_unregister_sysfs+0x22/0x30 [edac_core] RSP: 0018:ffff88030da3fe28 EFLAGS: 0001029 RAX: 2030203020312030 RBX: ffff880311b4e000 RCX: 000000000000095c RDX: 0000000000000001 RSI: ffff880327bb9600 RDI: 0000000000000286 RBP: ffff880311b4e750 R08: 0000000000000000 R09: ffffffff81296110 R10: 0000000000000400 R11: 0000000000000000 R12: ffff88030ba1ac68 R13: 0000000000000001 R14: 00000000011b02f0 R15: 0000000000000000 FS: 00007fc9bf8f5700(0000) GS:ffff8801a7c40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000403c90 CR3: 000000019ebdf000 CR4: 00000000000007e0 Stack: Call Trace: i7core_unregister_mci.isra.9 i7core_remove pci_device_remove __device_release_driver driver_detach bus_remove_driver pci_unregister_driver i7core_exit SyS_delete_module system_call_fastpath 0x7fc9bf426536 Code: 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 53 48 89 fb e8 52 2a 1f e1 48 8b bb a0 02 00 00 e8 46 59 1f e1 48 8b 83 a0 02 00 00 5b <48> 8b 38 e9 26 9a fe e0 66 0f 1f 44 00 00 66 66 66 66 90 48 8b RIP [<ffffffffa019da92>] edac_unregister_sysfs+0x22/0x30 [edac_core] RSP <ffff88030da3fe28> Signed-off-by: Borislav Petkov <[email protected]> Cc: Mauro Carvalho Chehab <[email protected]> Fixes: 7a623c0 ("edac: rewrite the sysfs code to use struct device") Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit deb7def upstream. When opening a file, SMB2_open() attempts to parse the lease state from the SMB2 CREATE Response. However, the parsing code was not careful to ensure that the create contexts are not empty or invalid, which can lead to out- of-bounds memory access. This can be seen easily by trying to read a file from a OSX 10.11 SMB3 server. Here is sample crash output: BUG: unable to handle kernel paging request at ffff8800a1a77cc6 IP: [<ffffffff8828a734>] SMB2_open+0x804/0x960 PGD 8f77067 PUD 0 Oops: 0000 [#1] SMP Modules linked in: CPU: 3 PID: 2876 Comm: cp Not tainted 4.5.0-rc3.x86_64.1+ #14 Hardware name: NETGEAR ReadyNAS 314 /ReadyNAS 314 , BIOS 4.6.5 10/11/2012 task: ffff880073cdc080 ti: ffff88005b31c000 task.ti: ffff88005b31c000 RIP: 0010:[<ffffffff8828a734>] [<ffffffff8828a734>] SMB2_open+0x804/0x960 RSP: 0018:ffff88005b31fa08 EFLAGS: 00010282 RAX: 0000000000000015 RBX: 0000000000000000 RCX: 0000000000000006 RDX: 0000000000000000 RSI: 0000000000000246 RDI: ffff88007eb8c8b0 RBP: ffff88005b31fad8 R08: 666666203d206363 R09: 6131613030383866 R10: 3030383866666666 R11: 00000000000002b0 R12: ffff8800660fd800 R13: ffff8800a1a77cc2 R14: 00000000424d53fe R15: ffff88005f5a28c0 FS: 00007f7c8a2897c0(0000) GS:ffff88007eb80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: ffff8800a1a77cc6 CR3: 000000005b281000 CR4: 00000000000006e0 Stack: ffff88005b31fa70 ffffffff88278789 00000000000001d3 ffff88005f5a2a80 ffffffff00000003 ffff88005d029d00 ffff88006fde05a0 0000000000000000 ffff88005b31fc78 ffff88006fde0780 ffff88005b31fb2f 0000000100000fe0 Call Trace: [<ffffffff88278789>] ? cifsConvertToUTF16+0x159/0x2d0 [<ffffffff8828cf68>] smb2_open_file+0x98/0x210 [<ffffffff8811e80c>] ? __kmalloc+0x1c/0xe0 [<ffffffff882685f4>] cifs_open+0x2a4/0x720 [<ffffffff88122cef>] do_dentry_open+0x1ff/0x310 [<ffffffff88268350>] ? cifsFileInfo_get+0x30/0x30 [<ffffffff88123d92>] vfs_open+0x52/0x60 [<ffffffff88131dd0>] path_openat+0x170/0xf70 [<ffffffff88097d48>] ? remove_wait_queue+0x48/0x50 [<ffffffff88133a29>] do_filp_open+0x79/0xd0 [<ffffffff8813f2ca>] ? __alloc_fd+0x3a/0x170 [<ffffffff881240c4>] do_sys_open+0x114/0x1e0 [<ffffffff881241a9>] SyS_open+0x19/0x20 [<ffffffff8896e257>] entry_SYSCALL_64_fastpath+0x12/0x6a Code: 4d 8d 6c 07 04 31 c0 4c 89 ee e8 47 6f e5 ff 31 c9 41 89 ce 44 89 f1 48 c7 c7 28 b1 bd 88 31 c0 49 01 cd 4c 89 ee e8 2b 6f e5 ff <45> 0f b7 75 04 48 c7 c7 31 b1 bd 88 31 c0 4d 01 ee 4c 89 f6 e8 RIP [<ffffffff8828a734>] SMB2_open+0x804/0x960 RSP <ffff88005b31fa08> CR2: ffff8800a1a77cc6 ---[ end trace d9f69ba64feee469 ]--- Signed-off-by: Justin Maggard <[email protected]> Signed-off-by: Steve French <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit d144dfe upstream. If we use USB ID pin as wakeup source, and there is a USB block device on this USB OTG (ID) cable, the system will be deadlock after system resume. The root cause for this problem is: the workqueue ci_otg may try to remove hcd before the driver resume has finished, and hcd will disconnect the device on it, then, it will call device_release_driver, and holds the device lock "dev->mutex", but it is never unlocked since it waits workqueue writeback to run to flush the block information, but the workqueue writeback is freezable, it is not thawed before driver resume has finished. When the driver (device: sd 0:0:0:0:) resume goes to dpm_complete, it tries to get its device lock "dev->mutex", but it can't get it forever, then the deadlock occurs. Below call stacks show the situation. So, in order to fix this problem, we need to change workqueue ci_otg as freezable, then the work item in this workqueue will be run after driver's resume, this workqueue will not be blocked forever like above case since the workqueue writeback has been thawed too. Tested at: i.mx6qdl-sabresd and i.mx6sx-sdb. [ 555.178869] kworker/u2:13 D c07de74c 0 826 2 0x00000000 [ 555.185310] Workqueue: ci_otg ci_otg_work [ 555.189353] Backtrace: [ 555.191849] [<c07de4fc>] (__schedule) from [<c07dec6c>] (schedule+0x48/0xa0) [ 555.198912] r10:ee471ba0 r9:00000000 r8:00000000 r7:00000002 r6:ee470000 r5:ee471ba4 [ 555.206867] r4:ee470000 [ 555.209453] [<c07dec24>] (schedule) from [<c07e2fc4>] (schedule_timeout+0x15c/0x1e0) [ 555.217212] r4:7fffffff r3:edc2b000 [ 555.220862] [<c07e2e68>] (schedule_timeout) from [<c07df6c8>] (wait_for_common+0x94/0x144) [ 555.229140] r8:00000000 r7:00000002 r6:ee470000 r5:ee471ba4 r4:7fffffff [ 555.235980] [<c07df634>] (wait_for_common) from [<c07df790>] (wait_for_completion+0x18/0x1c) [ 555.244430] r10:00000001 r9:c0b5563c r8:c0042e48 r7:ef086000 r6:eea4372c r5:ef131b00 [ 555.252383] r4:00000000 [ 555.254970] [<c07df778>] (wait_for_completion) from [<c0043cb8>] (flush_work+0x19c/0x234) [ 555.263177] [<c0043b1c>] (flush_work) from [<c0043fac>] (flush_delayed_work+0x48/0x4c) [ 555.271106] r8:ed5b5000 r7:c0b38a3c r6:eea439cc r5:eea4372c r4:eea4372c [ 555.277958] [<c0043f64>] (flush_delayed_work) from [<c00eae18>] (bdi_unregister+0x84/0xec) [ 555.286236] r4:eea43520 r3:20000153 [ 555.289885] [<c00ead94>] (bdi_unregister) from [<c02c2154>] (blk_cleanup_queue+0x180/0x29c) [ 555.298250] r5:eea43808 r4:eea43400 [ 555.301909] [<c02c1fd4>] (blk_cleanup_queue) from [<c0417914>] (__scsi_remove_device+0x48/0xb8) [ 555.310623] r7:00000000 r6:20000153 r5:ededa950 r4:ededa800 [ 555.316403] [<c04178cc>] (__scsi_remove_device) from [<c0415e90>] (scsi_forget_host+0x64/0x68) [ 555.325028] r5:ededa800 r4:ed5b5000 [ 555.328689] [<c0415e2c>] (scsi_forget_host) from [<c0409828>] (scsi_remove_host+0x78/0x104) [ 555.337054] r5:ed5b5068 r4:ed5b5000 [ 555.340709] [<c04097b0>] (scsi_remove_host) from [<c04cdfcc>] (usb_stor_disconnect+0x50/0xb4) [ 555.349247] r6:ed5b56e4 r5:ed5b5818 r4:ed5b5690 r3:00000008 [ 555.355025] [<c04cdf7c>] (usb_stor_disconnect) from [<c04b3bc8>] (usb_unbind_interface+0x78/0x25c) [ 555.363997] r8:c13919b4 r7:edd3c000 r6:edd3c020 r5:ee551c68 r4:ee551c00 r3:c04cdf7c [ 555.371892] [<c04b3b50>] (usb_unbind_interface) from [<c03dc248>] (__device_release_driver+0x8c/0x118) [ 555.381213] r10:00000001 r9:edd90c00 r8:c13919b4 r7:ee551c68 r6:c0b546e0 r5:c0b5563c [ 555.389167] r4:edd3c020 [ 555.391752] [<c03dc1bc>] (__device_release_driver) from [<c03dc2fc>] (device_release_driver+0x28/0x34) [ 555.401071] r5:edd3c020 r4:edd3c054 [ 555.404721] [<c03dc2d4>] (device_release_driver) from [<c03db304>] (bus_remove_device+0xe0/0x110) [ 555.413607] r5:edd3c020 r4:ef17f04c [ 555.417253] [<c03db224>] (bus_remove_device) from [<c03d8128>] (device_del+0x114/0x21c) [ 555.425270] r6:edd3c028 r5:edd3c020 r4:ee551c00 r3:00000000 [ 555.431045] [<c03d8014>] (device_del) from [<c04b1560>] (usb_disable_device+0xa4/0x1e8) [ 555.439061] r8:edd3c000 r7:eded8000 r6:00000000 r5:00000001 r4:ee551c00 [ 555.445906] [<c04b14bc>] (usb_disable_device) from [<c04a8e54>] (usb_disconnect+0x74/0x224) [ 555.454271] r9:edd90c00 r8:ee551000 r7:ee551c68 r6:ee551c9c r5:ee551c00 r4:00000001 [ 555.462156] [<c04a8de0>] (usb_disconnect) from [<c04a8fb8>] (usb_disconnect+0x1d8/0x224) [ 555.470259] r10:00000001 r9:edd90000 r8:ee471e2c r7:ee551468 r6:ee55149c r5:ee551400 [ 555.478213] r4:00000001 [ 555.480797] [<c04a8de0>] (usb_disconnect) from [<c04ae5ec>] (usb_remove_hcd+0xa0/0x1ac) [ 555.488813] r10:00000001 r9:ee471eb0 r8:00000000 r7:ef3d9500 r6:eded810c r5:eded80b0 [ 555.496765] r4:eded8000 [ 555.499351] [<c04ae54c>] (usb_remove_hcd) from [<c04d4158>] (host_stop+0x28/0x64) [ 555.506847] r6:eeb50010 r5:eded8000 r4:eeb51010 [ 555.511563] [<c04d4130>] (host_stop) from [<c04d09b8>] (ci_otg_work+0xc4/0x124) [ 555.518885] r6:00000001 r5:eeb50010 r4:eeb502a0 r3:c04d4130 [ 555.524665] [<c04d08f4>] (ci_otg_work) from [<c00454f0>] (process_one_work+0x194/0x420) [ 555.532682] r6:ef086000 r5:eeb502a0 r4:edc44480 [ 555.537393] [<c004535c>] (process_one_work) from [<c00457b0>] (worker_thread+0x34/0x514) [ 555.545496] r10:edc44480 r9:ef086000 r8:c0b1a100 r7:ef086034 r6:00000088 r5:edc44498 [ 555.553450] r4:ef086000 [ 555.556032] [<c004577c>] (worker_thread) from [<c004bab4>] (kthread+0xdc/0xf8) [ 555.563268] r10:00000000 r9:00000000 r8:00000000 r7:c004577c r6:edc44480 r5:eddc15c0 [ 555.571221] r4:00000000 [ 555.573804] [<c004b9d8>] (kthread) from [<c000fef0>] (ret_from_fork+0x14/0x24) [ 555.581040] r7:00000000 r6:00000000 r5:c004b9d8 r4:eddc15c0 [ 553.429383] sh D c07de74c 0 694 691 0x00000000 [ 553.435801] Backtrace: [ 553.438295] [<c07de4fc>] (__schedule) from [<c07dec6c>] (schedule+0x48/0xa0) [ 553.445358] r10:edd3c054 r9:edd3c078 r8:edddbd50 r7:edcbbc00 r6:c1377c34 r5:60000153 [ 553.453313] r4:eddda000 [ 553.455896] [<c07dec24>] (schedule) from [<c07deff8>] (schedule_preempt_disabled+0x10/0x14) [ 553.464261] r4:edd3c058 r3:0000000a [ 553.467910] [<c07defe8>] (schedule_preempt_disabled) from [<c07e0bbc>] (mutex_lock_nested+0x1a0/0x3e8) [ 553.477254] [<c07e0a1c>] (mutex_lock_nested) from [<c03e927c>] (dpm_complete+0xc0/0x1b0) [ 553.485358] r10:00561408 r9:edd3c054 r8:c0b4863c r7:edddbd90 r6:c0b485d8 r5:edd3c020 [ 553.493313] r4:edd3c0d0 [ 553.495896] [<c03e91bc>] (dpm_complete) from [<c03e9388>] (dpm_resume_end+0x1c/0x20) [ 553.503652] r9:00000000 r8:c0b1a9d0 r7:c1334ec0 r6:c1334edc r5:00000003 r4:00000010 [ 553.511544] [<c03e936c>] (dpm_resume_end) from [<c0079894>] (suspend_devices_and_enter+0x158/0x504) [ 553.520604] r4:00000000 r3:c1334efc [ 553.524250] [<c007973c>] (suspend_devices_and_enter) from [<c0079e74>] (pm_suspend+0x234/0x2cc) [ 553.532961] r10:00561408 r9:ed6b7300 r8:00000004 r7:c1334eec r6:00000000 r5:c1334ee8 [ 553.540914] r4:00000003 [ 553.543493] [<c0079c40>] (pm_suspend) from [<c0078a6c>] (state_store+0x6c/0xc0) [ 555.703684] 7 locks held by kworker/u2:13/826: [ 555.708140] #0: ("%s""ci_otg"){++++.+}, at: [<c0045484>] process_one_work+0x128/0x420 [ 555.716277] #1: ((&ci->work)){+.+.+.}, at: [<c0045484>] process_one_work+0x128/0x420 [ 555.724317] #2: (usb_bus_list_lock){+.+.+.}, at: [<c04ae5e4>] usb_remove_hcd+0x98/0x1ac [ 555.732626] #3: (&dev->mutex){......}, at: [<c04a8e28>] usb_disconnect+0x48/0x224 [ 555.740403] #4: (&dev->mutex){......}, at: [<c04a8e28>] usb_disconnect+0x48/0x224 [ 555.748179] #5: (&dev->mutex){......}, at: [<c03dc2f4>] device_release_driver+0x20/0x34 [ 555.756487] #6: (&shost->scan_mutex){+.+.+.}, at: [<c04097d0>] scsi_remove_host+0x20/0x104 Cc: Jun Li <[email protected]> Signed-off-by: Peter Chen <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

commit d6785d9 upstream. Running the following command: busybox cat /sys/kernel/debug/tracing/trace_pipe > /dev/null with any tracing enabled pretty very quickly leads to various NULL pointer dereferences and VM BUG_ON()s, such as these: BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: [<ffffffff8119df6c>] generic_pipe_buf_release+0xc/0x40 Call Trace: [<ffffffff811c48a3>] splice_direct_to_actor+0x143/0x1e0 [<ffffffff811c42e0>] ? generic_pipe_buf_nosteal+0x10/0x10 [<ffffffff811c49cf>] do_splice_direct+0x8f/0xb0 [<ffffffff81196869>] do_sendfile+0x199/0x380 [<ffffffff81197600>] SyS_sendfile64+0x90/0xa0 [<ffffffff8192cbee>] entry_SYSCALL_64_fastpath+0x12/0x6d page dumped because: VM_BUG_ON_PAGE(atomic_read(&page->_count) == 0) kernel BUG at include/linux/mm.h:367! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC RIP: [<ffffffff8119df9c>] generic_pipe_buf_release+0x3c/0x40 Call Trace: [<ffffffff811c48a3>] splice_direct_to_actor+0x143/0x1e0 [<ffffffff811c42e0>] ? generic_pipe_buf_nosteal+0x10/0x10 [<ffffffff811c49cf>] do_splice_direct+0x8f/0xb0 [<ffffffff81196869>] do_sendfile+0x199/0x380 [<ffffffff81197600>] SyS_sendfile64+0x90/0xa0 [<ffffffff8192cd1e>] tracesys_phase2+0x84/0x89 (busybox's cat uses sendfile(2), unlike the coreutils version) This is because tracing_splice_read_pipe() can call splice_to_pipe() with spd->nr_pages == 0. spd_pages underflows in splice_to_pipe() and we fill the page pointers and the other fields of the pipe_buffers with garbage. All other callers of splice_to_pipe() avoid calling it when nr_pages == 0, and we could make tracing_splice_read_pipe() do that too, but it seems reasonable to have splice_to_page() handle this condition gracefully. Signed-off-by: Rabin Vincent <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Al Viro <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

…antiated commit 3c2e226 upstream. arm:pxa_defconfig can result in the following crash if the max1111 driver is not instantiated. Unhandled fault: page domain fault (0x01b) at 0x00000000 pgd = c0004000 [00000000] *pgd=00000000 Internal error: : 1b [#1] PREEMPT ARM Modules linked in: CPU: 0 PID: 300 Comm: kworker/0:1 Not tainted 4.5.0-01301-g1701f680407c #10 Hardware name: SHARP Akita Workqueue: events sharpsl_charge_toggle task: c390a000 ti: c391e00 task.ti: c391e00 PC is at max1111_read_channel+0x20/0x30 LR is at sharpsl_pm_pxa_read_max1111+0x2c/0x3c pc : [<c03aaab0>] lr : [<c0024b50>] psr: 20000013 ... [<c03aaab0>] (max1111_read_channel) from [<c0024b50>] (sharpsl_pm_pxa_read_max1111+0x2c/0x3c) [<c0024b50>] (sharpsl_pm_pxa_read_max1111) from [<c00262e0>] (spitzpm_read_devdata+0x5c/0xc4) [<c00262e0>] (spitzpm_read_devdata) from [<c0024094>] (sharpsl_check_battery_temp+0x78/0x110) [<c0024094>] (sharpsl_check_battery_temp) from [<c0024f9c>] (sharpsl_charge_toggle+0x48/0x110) [<c0024f9c>] (sharpsl_charge_toggle) from [<c004429c>] (process_one_work+0x14c/0x48c) [<c004429c>] (process_one_work) from [<c0044618>] (worker_thread+0x3c/0x5d4) [<c0044618>] (worker_thread) from [<c004a238>] (kthread+0xd0/0xec) [<c004a238>] (kthread) from [<c000a670>] (ret_from_fork+0x14/0x24) This can occur because the SPI controller driver (SPI_PXA2XX) is built as module and thus not necessarily loaded. While building SPI_PXA2XX into the kernel would make the problem disappear, it appears prudent to ensure that the driver is instantiated before accessing its data structures. Cc: Arnd Bergmann <[email protected]> Signed-off-by: Guenter Roeck <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

…er() commit 894f2fc upstream. When unexpected situation happened (e.g. tx/rx irq happened while DMAC is used), the usbhsf_pkt_handler() was possible to cause NULL pointer dereference like the followings: Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c0004000 [00000000] *pgd=00000000 Internal error: Oops: 80000007 [#1] SMP ARM Modules linked in: usb_f_acm u_serial g_serial libcomposite CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.5.0-rc6-00842-gac57066-dirty #63 Hardware name: Generic R8A7790 (Flattened Device Tree) task: c0729c00 ti: c0724000 task.ti: c0724000 PC is at 0x0 LR is at usbhsf_pkt_handler+0xac/0x118 pc : [<00000000>] lr : [<c03257e0>] psr: 60000193 sp : c0725db8 ip : 00000000 fp : c0725df4 r10: 00000001 r9 : 00000193 r8 : ef3ccab4 r7 : ef3cca10 r6 : eea4586c r5 : 00000000 r4 : ef19ceb4 r3 : 00000000 r2 : 0000009c r1 : c0725dc4 r0 : ef19ceb4 This patch adds a condition to avoid the dereference. Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support") Signed-off-by: Yoshihiro Shimoda <[email protected]> Signed-off-by: Felipe Balbi <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>

add initial CODE PixiePro board support

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otavio closed this Nov 5, 2015

neuberfran mentioned this pull request Nov 15, 2023

Issue to put kernel branch 4.9-1.0.x-imx in imx7d-pico with linux-fslc with Kernel 6.6 #648

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add initial CODE PixiePro board support#1

add initial CODE PixiePro board support#1
code-ing wants to merge 1 commit intoFreescale:patches-4.1from
code-ing:patches-4.1

code-ing commented Oct 21, 2015

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otavio commented Nov 5, 2015

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code-ing commented Oct 21, 2015

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otavio commented Nov 5, 2015

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