dhcpcd -U intermittently fails if stdin is connected to a pipe #285
Description
System details:
# dhcpcd --version
dhcpcd 10.0.6
Copyright (c) 2006-2023 Roy Marples
Compiled in features: INET ARP ARPing IPv4LL INET6 DHCPv6 AUTH PRIVSEP
# uname -a
Linux SRU-worked-azure 6.6.0-1001-azure #1-Ubuntu SMP Fri Dec 1 11:34:03 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Dumping a lease file piped via stdin fails:
# cat /var/lib/dhcpcd/eth0.lease | dhcpcd --dumplease --ipv4only
dhcpcd is not running
But it doesn't with file redirection:
# dhcpcd --dumplease --ipv4only < /var/lib/dhcpcd/eth0.lease
ip_address=10.0.0.4
subnet_cidr=24
broadcast_address=10.0.0.255
network_number=10.0.0.0
server_name=IAD201121002027
subnet_mask=255.255.255.0
classless_static_routes=0.0.0.0/0 10.0.0.1 168.63.129.16/32 10.0.0.1 169.254.169.254/32 10.0.0.1
routers=10.0.0.1
domain_name_servers=168.63.129.16
domain_name=v1n0blf1qpvufijtbcm2fvnk3c.bx.internal.cloudapp.net
dhcp_lease_time=4294967295
dhcp_message_type=5
dhcp_server_identifier=168.63.129.16
dhcp_renewal_time=4294967295
dhcp_rebinding_time=4294967295
But it is inconsistent and sometimes works, even if dhcpcd isn't running:
# pgrep dhcpcd -a
# cat /var/lib/dhcpcd/eth0.lease | dhcpcd --dumplease --ipv4only
ip_address=10.0.0.4
subnet_cidr=24
broadcast_address=10.0.0.255
network_number=10.0.0.0
server_name=IAD201121002027
subnet_mask=255.255.255.0
classless_static_routes=0.0.0.0/0 10.0.0.1 168.63.129.16/32 10.0.0.1 169.254.169.254/32 10.0.0.1
routers=10.0.0.1
domain_name_servers=168.63.129.16
domain_name=v1n0blf1qpvufijtbcm2fvnk3c.bx.internal.cloudapp.net
dhcp_lease_time=4294967295
dhcp_message_type=5
dhcp_server_identifier=168.63.129.16
dhcp_renewal_time=4294967295
dhcp_rebinding_time=4294967295
an strace:
execve("/usr/sbin/dhcpcd", ["dhcpcd", "--dumplease", "--ipv4only"], 0x7fffd78fdc40 /* 20 vars */) = 0
brk(NULL) = 0x5c8869f85000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffd9ea76e70) = -1 EINVAL (Invalid argument)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7afc6e9e4000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=20577, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 20577, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7afc6e9de000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libcrypto.so.3", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=5227352, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 5241760, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7afc6e400000
mmap(0x7afc6e4b3000, 3256320, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xb3000) = 0x7afc6e4b3000
mmap(0x7afc6e7ce000, 856064, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3ce000) = 0x7afc6e7ce000
mmap(0x7afc6e89f000, 385024, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x49e000) = 0x7afc6e89f000
mmap(0x7afc6e8fd000, 11168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7afc6e8fd000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\202\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=2104632, ...}, AT_EMPTY_PATH) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
mmap(NULL, 2149776, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7afc6e000000
mmap(0x7afc6e026000, 1568768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x26000) = 0x7afc6e026000
mmap(0x7afc6e1a5000, 348160, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a5000) = 0x7afc6e1a5000
mmap(0x7afc6e1fa000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1f9000) = 0x7afc6e1fa000
mmap(0x7afc6e200000, 52624, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7afc6e200000
close(3) = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7afc6e9db000
arch_prctl(ARCH_SET_FS, 0x7afc6e9db740) = 0
set_tid_address(0x7afc6e9dba10) = 18051
set_robust_list(0x7afc6e9dba20, 24) = 0
rseq(0x7afc6e9dc060, 0x20, 0, 0x53053053) = 0
mprotect(0x7afc6e1fa000, 16384, PROT_READ) = 0
mprotect(0x7afc6e89f000, 372736, PROT_READ) = 0
mprotect(0x5c8869337000, 8192, PROT_READ) = 0
mprotect(0x7afc6ea1b000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
munmap(0x7afc6e9de000, 20577) = 0
getrandom("\x82\xe9\x7d\x12\x36\x6e\x8e\xc4", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x5c8869f85000
brk(0x5c8869fa6000) = 0x5c8869fa6000
fcntl(0, F_GETFD) = 0
fcntl(1, F_GETFD) = 0
fcntl(2, F_GETFD) = 0
openat(AT_FDCWD, "/etc/localtime", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=114, ...}, AT_EMPTY_PATH) = 0
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=114, ...}, AT_EMPTY_PATH) = 0
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 114
lseek(3, -60, SEEK_CUR) = 54
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 60
close(3) = 0
readlink("/proc/self/exe", "/usr/sbin/dhcpcd", 4097) = 16
socket(AF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
close(3) = 0
socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 3
close(3) = 0
openat(AT_FDCWD, "/etc/dhcpcd.conf", O_RDONLY) = 3
read(3, "# A sample configuration for dhc"..., 65536) = 1429
close(3) = 0
newfstatat(AT_FDCWD, "/etc/dhcpcd.conf", {st_mode=S_IFREG|0644, st_size=1429, ...}, 0) = 0
chdir("/") = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[PIPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7afc6e042900}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [HUP INT USR1 USR2 ALRM TERM CHLD], [], 8) = 0
rt_sigaction(SIGTERM, {sa_handler=0x5c88692e5080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7afc6e042900}, NULL, 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x5c88692e5080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7afc6e042900}, NULL, 8) = 0
rt_sigaction(SIGALRM, {sa_handler=0x5c88692e5080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7afc6e042900}, NULL, 8) = 0
rt_sigaction(SIGHUP, {sa_handler=0x5c88692e5080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7afc6e042900}, NULL, 8) = 0
rt_sigaction(SIGUSR1, {sa_handler=0x5c88692e5080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7afc6e042900}, NULL, 8) = 0
rt_sigaction(SIGUSR2, {sa_handler=0x5c88692e5080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7afc6e042900}, NULL, 8) = 0
rt_sigaction(SIGCHLD, {sa_handler=0x5c88692e5080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7afc6e042900}, NULL, 8) = 0
futex(0x7afc6e8fd1e4, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fd1e0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fd1dc, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fd5c0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
brk(0x5c8869fc7000) = 0x5c8869fc7000
futex(0x7afc6e8fd1d4, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fd1d0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fce10, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fd0c0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fcde8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fd1d8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
openat(AT_FDCWD, "/usr/lib/ssl/openssl.cnf", O_RDONLY) = 3
futex(0x7afc6e8fcb10, FUTEX_WAKE_PRIVATE, 2147483647) = 0
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=12324, ...}, AT_EMPTY_PATH) = 0
read(3, "#\n# OpenSSL example configuratio"..., 4096) = 4096
read(3, "d attributes must be the same, a"..., 4096) = 4096
read(3, "coding of an extension: beware e"..., 4096) = 4096
read(3, " = $insta::certout # insta.cert."..., 4096) = 36
read(3, "", 4096) = 0
close(3) = 0
futex(0x7afc6e8fcd64, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fcda4, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fd1c0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fcd6c, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x7afc6e8fd1cc, FUTEX_WAKE_PRIVATE, 2147483647) = 0
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
newfstatat(AT_FDCWD, "/etc/nsswitch.conf", {st_mode=S_IFREG|0644, st_size=526, ...}, 0) = 0
newfstatat(AT_FDCWD, "/", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=526, ...}, AT_EMPTY_PATH) = 0
read(3, "# /etc/nsswitch.conf\n#\n# Example"..., 4096) = 526
read(3, "", 4096) = 0
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=526, ...}, AT_EMPTY_PATH) = 0
close(3) = 0
openat(AT_FDCWD, "/etc/passwd", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=1837, ...}, AT_EMPTY_PATH) = 0
lseek(3, 0, SEEK_SET) = 0
read(3, "root:x:0:0:root:/root:/bin/bash\n"..., 4096) = 1837
close(3) = 0
newfstatat(AT_FDCWD, "/usr/lib/dhcpcd", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
ioctl(0, FIONREAD, [370]) = 0
chroot("/usr/lib/dhcpcd") = 0
chdir("/") = 0
setgroups(1, [65534]) = 0
setgid(65534) = 0
setuid(100) = 0
ioctl(2, TCGETS, 0x7ffd9ea768a0) = -1 ENOTTY (Inappropriate ioctl for device)
prlimit64(0, RLIMIT_NPROC, {rlim_cur=0, rlim_max=0}, NULL) = 0
prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) = 0
prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, {len=136, filter=0x5c886933b060}) = 0
read(0, "\2\1\6\0F\255XZ\0\0\200\0\0\0\0\0\n\0\0\4\250?\201\20\250?\201\20\0\"H/"..., 9230) = 370
newfstatat(1, "", {st_mode=S_IFIFO|0600, st_size=0, ...}, AT_EMPTY_PATH) = 0
exit_group(0) = ?
+++ exited with 0 +++
I see that privsep might be hiding the bigger picture, so I run the same under
strace --follow-forks --output-separately --output=./strace.log, and I see:
strace.log:
sandbox: seccomp
reading standard input
sandbox: seccomp
reading standard input
and
strace.log.18379
execve("/usr/sbin/dhcpcd", ["dhcpcd", "--dumplease", "--ipv4only", "--debug"], 0x7ffdf30b0a20 /* 20 vars */) = 0
brk(NULL) = 0x5dcd6b42e000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffd556f7ac0) = -1 EINVAL (Invalid argument)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x74d42f005000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=20577, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 20577, PROT_READ, MAP_PRIVATE, 3, 0) = 0x74d42efff000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libcrypto.so.3", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=5227352, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 5241760, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x74d42ea00000
mmap(0x74d42eab3000, 3256320, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xb3000) = 0x74d42eab3000
mmap(0x74d42edce000, 856064, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3ce000) = 0x74d42edce000
mmap(0x74d42ee9f000, 385024, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x49e000) = 0x74d42ee9f000
mmap(0x74d42eefd000, 11168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x74d42eefd000
close(3) = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\202\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=2104632, ...}, AT_EMPTY_PATH) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
mmap(NULL, 2149776, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x74d42e600000
mmap(0x74d42e626000, 1568768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x26000) = 0x74d42e626000
mmap(0x74d42e7a5000, 348160, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a5000) = 0x74d42e7a5000
mmap(0x74d42e7fa000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1f9000) = 0x74d42e7fa000
mmap(0x74d42e800000, 52624, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x74d42e800000
close(3) = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x74d42effc000
arch_prctl(ARCH_SET_FS, 0x74d42effc740) = 0
set_tid_address(0x74d42effca10) = 18379
set_robust_list(0x74d42effca20, 24) = 0
rseq(0x74d42effd060, 0x20, 0, 0x53053053) = 0
mprotect(0x74d42e7fa000, 16384, PROT_READ) = 0
mprotect(0x74d42ee9f000, 372736, PROT_READ) = 0
mprotect(0x5dcd698c8000, 8192, PROT_READ) = 0
mprotect(0x74d42f03c000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
munmap(0x74d42efff000, 20577) = 0
getrandom("\x55\x0e\xba\x30\xde\x7c\x07\x40", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x5dcd6b42e000
brk(0x5dcd6b44f000) = 0x5dcd6b44f000
fcntl(0, F_GETFD) = 0
fcntl(1, F_GETFD) = 0
fcntl(2, F_GETFD) = 0
openat(AT_FDCWD, "/etc/localtime", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=114, ...}, AT_EMPTY_PATH) = 0
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=114, ...}, AT_EMPTY_PATH) = 0
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 114
lseek(3, -60, SEEK_CUR) = 54
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 60
close(3) = 0
readlink("/proc/self/exe", "/usr/sbin/dhcpcd", 4097) = 16
socket(AF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
close(3) = 0
socket(AF_INET6, SOCK_DGRAM, IPPROTO_IP) = 3
close(3) = 0
openat(AT_FDCWD, "/etc/dhcpcd.conf", O_RDONLY) = 3
read(3, "# A sample configuration for dhc"..., 65536) = 1429
close(3) = 0
newfstatat(AT_FDCWD, "/etc/dhcpcd.conf", {st_mode=S_IFREG|0644, st_size=1429, ...}, 0) = 0
chdir("/") = 0
rt_sigaction(SIGPIPE, {sa_handler=SIG_IGN, sa_mask=[PIPE], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x74d42e642900}, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [HUP INT USR1 USR2 ALRM TERM CHLD], [], 8) = 0
rt_sigaction(SIGTERM, {sa_handler=0x5dcd69876080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x74d42e642900}, NULL, 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x5dcd69876080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x74d42e642900}, NULL, 8) = 0
rt_sigaction(SIGALRM, {sa_handler=0x5dcd69876080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x74d42e642900}, NULL, 8) = 0
rt_sigaction(SIGHUP, {sa_handler=0x5dcd69876080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x74d42e642900}, NULL, 8) = 0
rt_sigaction(SIGUSR1, {sa_handler=0x5dcd69876080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x74d42e642900}, NULL, 8) = 0
rt_sigaction(SIGUSR2, {sa_handler=0x5dcd69876080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x74d42e642900}, NULL, 8) = 0
rt_sigaction(SIGCHLD, {sa_handler=0x5dcd69876080, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x74d42e642900}, NULL, 8) = 0
futex(0x74d42eefd1e4, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefd1e0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefd1dc, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefd5c0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
brk(0x5dcd6b470000) = 0x5dcd6b470000
futex(0x74d42eefd1d4, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefd1d0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefce10, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefd0c0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefcde8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefd1d8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
openat(AT_FDCWD, "/usr/lib/ssl/openssl.cnf", O_RDONLY) = 3
futex(0x74d42eefcb10, FUTEX_WAKE_PRIVATE, 2147483647) = 0
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=12324, ...}, AT_EMPTY_PATH) = 0
read(3, "#\n# OpenSSL example configuratio"..., 4096) = 4096
read(3, "d attributes must be the same, a"..., 4096) = 4096
read(3, "coding of an extension: beware e"..., 4096) = 4096
read(3, " = $insta::certout # insta.cert."..., 4096) = 36
read(3, "", 4096) = 0
close(3) = 0
futex(0x74d42eefcd64, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefcda4, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefd1c0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefcd6c, FUTEX_WAKE_PRIVATE, 2147483647) = 0
futex(0x74d42eefd1cc, FUTEX_WAKE_PRIVATE, 2147483647) = 0
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3) = 0
newfstatat(AT_FDCWD, "/etc/nsswitch.conf", {st_mode=S_IFREG|0644, st_size=526, ...}, 0) = 0
newfstatat(AT_FDCWD, "/", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=526, ...}, AT_EMPTY_PATH) = 0
read(3, "# /etc/nsswitch.conf\n#\n# Example"..., 4096) = 526
read(3, "", 4096) = 0
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=526, ...}, AT_EMPTY_PATH) = 0
close(3) = 0
openat(AT_FDCWD, "/etc/passwd", O_RDONLY|O_CLOEXEC) = 3
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=1837, ...}, AT_EMPTY_PATH) = 0
lseek(3, 0, SEEK_SET) = 0
read(3, "root:x:0:0:root:/root:/bin/bash\n"..., 4096) = 1837
close(3) = 0
newfstatat(AT_FDCWD, "/usr/lib/dhcpcd", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
ioctl(0, FIONREAD, [370]) = 0
chroot("/usr/lib/dhcpcd") = 0
chdir("/") = 0
setgroups(1, [65534]) = 0
setgid(65534) = 0
setuid(100) = 0
ioctl(2, TCGETS, 0x7ffd556f74f0) = -1 ENOTTY (Inappropriate ioctl for device)
prlimit64(0, RLIMIT_NPROC, {rlim_cur=0, rlim_max=0}, NULL) = 0
prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) = 0
prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, {len=136, filter=0x5dcd698cc060}) = 0
write(2, "sandbox: seccomp\n", 17) = 17
write(2, "reading standard input\n", 23) = 23
read(0, "\2\1\6\0>1\23\205\0\0\200\0\0\0\0\0\n\0\0\4\250?\201\20\250?\201\20\0\"H/"..., 9230) = 370
newfstatat(1, "", {st_mode=S_IFIFO|0600, st_size=0, ...}, AT_EMPTY_PATH) = 0
exit_group(0) = ?
+++ exited with 0 +++