fix: use original address if no entry_pc or low_pc found#41
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milianw merged 1 commit intoKDAB:hotspotfrom May 29, 2025
Merged
fix: use original address if no entry_pc or low_pc found#41milianw merged 1 commit intoKDAB:hotspotfrom
milianw merged 1 commit intoKDAB:hotspotfrom
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It is not guaranteed that an inline scope DIE will have an entry_pc or low_pc. If it is not present, use the original address instead of 0. Without this, I was seeing unrelated inline scopes being deduplicated together resulting in incorrect backtraces.
milianw
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May 29, 2025
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any chance to get a test for this? but lgtm so I'm fine with merging this as-is
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May 29, 2025
In qt6 QHash is no longer iterator safe
==138723==ERROR: AddressSanitizer: heap-use-after-free on address 0x51b000035c68 at pc 0x5d085ec696b9 bp 0x7ffe43776e00 sp 0x7ffe43776df0
READ of size 8 at 0x51b000035c68 thread T0
#0 0x5d085ec696b8 in void qt_ptr_swap<QTypedArrayData<char> >(QTypedArrayData<char>*&, QTypedArrayData<char>*&) /usr/include/qt6/QtCore/qswap.h:31
KDAB#1 0x5d085ec67e4f in QArrayDataPointer<char>::swap(QArrayDataPointer<char>&) /usr/include/qt6/QtCore/qarraydatapointer.h:131
KDAB#2 0x5d085ec66e97 in QByteArray::swap(QByteArray&) /usr/include/qt6/QtCore/qbytearray.h:103
#3 0x5d085ec66da8 in QByteArray::operator=(QByteArray&&) /usr/include/qt6/QtCore/qbytearray.h:101
KDAB#4 0x5d085ef0ca5c in CuDieRangeMapping::dieName(Dwarf_Die*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:364
KDAB#5 0x5d085ee36e7c in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:768
KDAB#6 0x5d085ee39eea in PerfSymbolTable::lookupFrame(unsigned long, bool, bool*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:774
KDAB#7 0x5d085ed06ec5 in frameCallback /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:541
KDAB#8 0x75a7437f7b08 in dwfl_thread_getframes (/usr/lib/libdw.so.1+0x5bb08) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#9 0x75a7437f2eba (/usr/lib/libdw.so.1+0x56eba) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#10 0x75a7437f3f2b in dwfl_getthreads (/usr/lib/libdw.so.1+0x57f2b) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#11 0x75a7437f7e81 in dwfl_getthread_frames (/usr/lib/libdw.so.1+0x5be81) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#12 0x5d085ed07b21 in PerfUnwind::unwindStack() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:557
KDAB#13 0x5d085ed0d129 in PerfUnwind::analyze(PerfRecordSample const&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:744
KDAB#14 0x5d085ed1b65f in PerfUnwind::flushEventBuffer(unsigned int) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:1115
KDAB#15 0x5d085ed164b1 in PerfUnwind::finishedRound() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:976
KDAB#16 0x5d085ecc2fe8 in PerfData::processEvents(QDataStream&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:243
KDAB#17 0x5d085eccbdc2 in PerfData::doRead() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:414
KDAB#18 0x5d085eccd6f3 in PerfData::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:431
KDAB#19 0x5d085ebfa511 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:383
KDAB#20 0x5d085ebfd5c6 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:452
KDAB#21 0x5d085ec0b9b9 in call /usr/include/qt6/QtCore/qobjectdefs_impl.h:137
KDAB#22 0x5d085ec0b121 in call<QtPrivate::List<>, void> /usr/include/qt6/QtCore/qobjectdefs_impl.h:345
KDAB#23 0x5d085ec0aa1e in impl /usr/include/qt6/QtCore/qobjectdefs_impl.h:555
KDAB#24 0x75a7429a3456 (/usr/lib/libQt6Core.so.6+0x1a3456) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#25 0x5d085ec33520 in PerfHeader::finished() /home/lieven/KDAB/hotspot/build-dev-asan-qt6/3rdparty/libhotspot-perfparser_autogen/6F7ISLN55V/moc_perfheader.cpp:234
KDAB#26 0x5d085ec5d91c in PerfHeader::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfheader.cpp:122
KDAB#27 0x5d085ec2f1b7 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (PerfHeader::*)()>::call(void (PerfHeader::*)(), PerfHeader*, void**) /usr/include/qt6/QtCore/qobjectdefs_impl.h:145
KDAB#28 0x5d085ec2e24a in void QtPrivate::FunctionPointer<void (PerfHeader::*)()>::call<QtPrivate::List<>, void>(void (PerfHeader::*)(), PerfHeader*, void**) /usr/include/qt6/QtCore/qobjectdefs_impl.h:182
KDAB#29 0x5d085ec2bf91 in QtPrivate::QCallableObject<void (PerfHeader::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) /usr/include/qt6/QtCore/qobjectdefs_impl.h:553
KDAB#30 0x75a74298d93e in QObject::event(QEvent*) (/usr/lib/libQt6Core.so.6+0x18d93e) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#31 0x75a742945bc2 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (/usr/lib/libQt6Core.so.6+0x145bc2) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#32 0x75a742945faa in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (/usr/lib/libQt6Core.so.6+0x145faa) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#33 0x75a742babe4b (/usr/lib/libQt6Core.so.6+0x3abe4b) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#34 0x75a740d13558 (/usr/lib/libglib-2.0.so.0+0x5d558) (BuildId: 7b781c8d1a6e2161838c5d8f3bd797797c132753)
KDAB#35 0x75a740d76156 (/usr/lib/libglib-2.0.so.0+0xc0156) (BuildId: 7b781c8d1a6e2161838c5d8f3bd797797c132753)
KDAB#36 0x75a740d12a54 in g_main_context_iteration (/usr/lib/libglib-2.0.so.0+0x5ca54) (BuildId: 7b781c8d1a6e2161838c5d8f3bd797797c132753)
KDAB#37 0x75a742ba985c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (/usr/lib/libQt6Core.so.6+0x3a985c) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#38 0x75a742950105 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (/usr/lib/libQt6Core.so.6+0x150105) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#39 0x75a74294a27c in QCoreApplication::exec() (/usr/lib/libQt6Core.so.6+0x14a27c) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#40 0x5d085ec04e44 in main /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:481
KDAB#41 0x75a741a34e07 (/usr/lib/libc.so.6+0x25e07) (BuildId: 98b3d8e0b8c534c769cb871c438b4f8f3a8e4bf3)
KDAB#42 0x75a741a34ecb in __libc_start_main (/usr/lib/libc.so.6+0x25ecb) (BuildId: 98b3d8e0b8c534c769cb871c438b4f8f3a8e4bf3)
KDAB#43 0x5d085ebf4b64 in _start (/home/lieven/KDAB/hotspot/build-dev-asan-qt6/libexec/hotspot-perfparser+0x72db64) (BuildId: 580374afdfc7f3994c76369459f6848384c3c771)
0x51b000035c68 is located 1512 bytes inside of 1536-byte region [0x51b000035680,0x51b000035c80)
freed by thread T0 here:
#0 0x75a7430ff22a in operator delete[](void*) /usr/src/debug/gcc/gcc/libsanitizer/asan/asan_new_delete.cpp:155
KDAB#1 0x5d085ef2c5af in QHashPrivate::Span<QHashPrivate::Node<unsigned long, QByteArray> >::addStorage() /usr/include/qt6/QtCore/qhash.h:409
KDAB#2 0x5d085ef240f5 in QHashPrivate::Span<QHashPrivate::Node<unsigned long, QByteArray> >::insert(unsigned long) /usr/include/qt6/QtCore/qhash.h:283
#3 0x5d085ef1d324 in QHashPrivate::Data<QHashPrivate::Node<unsigned long, QByteArray> >::Bucket::insert() const /usr/include/qt6/QtCore/qhash.h:511
KDAB#4 0x5d085ef18c64 in QHashPrivate::Data<QHashPrivate::Node<unsigned long, QByteArray> >::findOrInsert(unsigned long const&) /usr/include/qt6/QtCore/qhash.h:728
KDAB#5 0x5d085ef1551a in QHash<unsigned long, QByteArray>::operator[](unsigned long const&) /usr/include/qt6/QtCore/qhash.h:1064
KDAB#6 0x5d085ef08e30 in prependScopeNames(QByteArray&, Dwarf_Die*, QHash<unsigned long, QByteArray>&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:204
KDAB#7 0x5d085ef0965b in qualifiedDieName(Dwarf_Die*, QHash<unsigned long, QByteArray>&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:229
KDAB#8 0x5d085ef0c9b8 in CuDieRangeMapping::dieName(Dwarf_Die*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:364
KDAB#9 0x5d085ee36e7c in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:768
KDAB#10 0x5d085ee39eea in PerfSymbolTable::lookupFrame(unsigned long, bool, bool*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:774
KDAB#11 0x5d085ed06ec5 in frameCallback /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:541
KDAB#12 0x75a7437f7b08 in dwfl_thread_getframes (/usr/lib/libdw.so.1+0x5bb08) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#13 0x75a7437f2eba (/usr/lib/libdw.so.1+0x56eba) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#14 0x75a7437f3f2b in dwfl_getthreads (/usr/lib/libdw.so.1+0x57f2b) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#15 0x75a7437f7e81 in dwfl_getthread_frames (/usr/lib/libdw.so.1+0x5be81) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#16 0x5d085ed07b21 in PerfUnwind::unwindStack() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:557
KDAB#17 0x5d085ed0d129 in PerfUnwind::analyze(PerfRecordSample const&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:744
KDAB#18 0x5d085ed1b65f in PerfUnwind::flushEventBuffer(unsigned int) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:1115
KDAB#19 0x5d085ed164b1 in PerfUnwind::finishedRound() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:976
KDAB#20 0x5d085ecc2fe8 in PerfData::processEvents(QDataStream&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:243
KDAB#21 0x5d085eccbdc2 in PerfData::doRead() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:414
KDAB#22 0x5d085eccd6f3 in PerfData::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:431
KDAB#23 0x5d085ebfa511 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:383
KDAB#24 0x5d085ebfd5c6 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:452
KDAB#25 0x5d085ec0b9b9 in call /usr/include/qt6/QtCore/qobjectdefs_impl.h:137
KDAB#26 0x5d085ec0b121 in call<QtPrivate::List<>, void> /usr/include/qt6/QtCore/qobjectdefs_impl.h:345
KDAB#27 0x5d085ec0aa1e in impl /usr/include/qt6/QtCore/qobjectdefs_impl.h:555
KDAB#28 0x75a7429a3456 (/usr/lib/libQt6Core.so.6+0x1a3456) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#29 0x5d085ec33520 in PerfHeader::finished() /home/lieven/KDAB/hotspot/build-dev-asan-qt6/3rdparty/libhotspot-perfparser_autogen/6F7ISLN55V/moc_perfheader.cpp:234
previously allocated by thread T0 here:
#0 0x75a7430fe682 in operator new[](unsigned long) /usr/src/debug/gcc/gcc/libsanitizer/asan/asan_new_delete.cpp:98
KDAB#1 0x5d085ef2c181 in QHashPrivate::Span<QHashPrivate::Node<unsigned long, QByteArray> >::addStorage() /usr/include/qt6/QtCore/qhash.h:394
KDAB#2 0x5d085ef240f5 in QHashPrivate::Span<QHashPrivate::Node<unsigned long, QByteArray> >::insert(unsigned long) /usr/include/qt6/QtCore/qhash.h:283
#3 0x5d085ef1d324 in QHashPrivate::Data<QHashPrivate::Node<unsigned long, QByteArray> >::Bucket::insert() const /usr/include/qt6/QtCore/qhash.h:511
KDAB#4 0x5d085ef18c64 in QHashPrivate::Data<QHashPrivate::Node<unsigned long, QByteArray> >::findOrInsert(unsigned long const&) /usr/include/qt6/QtCore/qhash.h:728
KDAB#5 0x5d085ef1551a in QHash<unsigned long, QByteArray>::operator[](unsigned long const&) /usr/include/qt6/QtCore/qhash.h:1064
KDAB#6 0x5d085ef0c883 in CuDieRangeMapping::dieName(Dwarf_Die*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:362
KDAB#7 0x5d085ee36e7c in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:768
KDAB#8 0x5d085ee39eea in PerfSymbolTable::lookupFrame(unsigned long, bool, bool*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:774
KDAB#9 0x5d085ed06ec5 in frameCallback /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:541
KDAB#10 0x75a7437f7b08 in dwfl_thread_getframes (/usr/lib/libdw.so.1+0x5bb08) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#11 0x75a7437f2eba (/usr/lib/libdw.so.1+0x56eba) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#12 0x75a7437f3f2b in dwfl_getthreads (/usr/lib/libdw.so.1+0x57f2b) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#13 0x75a7437f7e81 in dwfl_getthread_frames (/usr/lib/libdw.so.1+0x5be81) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a)
KDAB#14 0x5d085ed07b21 in PerfUnwind::unwindStack() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:557
KDAB#15 0x5d085ed0d129 in PerfUnwind::analyze(PerfRecordSample const&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:744
KDAB#16 0x5d085ed1b65f in PerfUnwind::flushEventBuffer(unsigned int) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:1115
KDAB#17 0x5d085ed164b1 in PerfUnwind::finishedRound() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:976
KDAB#18 0x5d085ecc2fe8 in PerfData::processEvents(QDataStream&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:243
KDAB#19 0x5d085eccbdc2 in PerfData::doRead() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:414
KDAB#20 0x5d085eccd6f3 in PerfData::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:431
KDAB#21 0x5d085ebfa511 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:383
KDAB#22 0x5d085ebfd5c6 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:452
KDAB#23 0x5d085ec0b9b9 in call /usr/include/qt6/QtCore/qobjectdefs_impl.h:137
KDAB#24 0x5d085ec0b121 in call<QtPrivate::List<>, void> /usr/include/qt6/QtCore/qobjectdefs_impl.h:345
KDAB#25 0x5d085ec0aa1e in impl /usr/include/qt6/QtCore/qobjectdefs_impl.h:555
KDAB#26 0x75a7429a3456 (/usr/lib/libQt6Core.so.6+0x1a3456) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09)
KDAB#27 0x5d085ec33520 in PerfHeader::finished() /home/lieven/KDAB/hotspot/build-dev-asan-qt6/3rdparty/libhotspot-perfparser_autogen/6F7ISLN55V/moc_perfheader.cpp:234
KDAB#28 0x5d085ec5d91c in PerfHeader::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfheader.cpp:122
KDAB#29 0x5d085ec2f1b7 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (PerfHeader::*)()>::call(void (PerfHeader::*)(), PerfHeader*, void**) /usr/include/qt6/QtCore/qobjectdefs_impl.h:145
SUMMARY: AddressSanitizer: heap-use-after-free /usr/include/qt6/QtCore/qswap.h:31 in void qt_ptr_swap<QTypedArrayData<char> >(QTypedArrayData<char>*&, QTypedArrayData<char>*&)
Shadow bytes around the buggy address:
0x51b000035980: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x51b000035a00: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x51b000035a80: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x51b000035b00: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x51b000035b80: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x51b000035c00: fd fd fd fd fd fd fd fd fd fd fd fd fd[fd]fd fd
0x51b000035c80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x51b000035d00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x51b000035d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x51b000035e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x51b000035e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==138723==ABORTING
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It turns out that this one needs some test updates (tst_elfmap fails with a diff that starts like below). It wasn't clear how to update the perf.data.expected.txt.zlib file. It looks like I need to compress it with the qCompress function. Is there a convenient way to do that without writing my own program? Maybe we can just store these files uncompressed in the source tree? They aren't that large and it should also make it possible to see the diffs in |
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It is not guaranteed that an inline scope DIE will have an entry_pc or low_pc. If it is not present, use the original address instead of 0. Without this, I was seeing unrelated inline scopes being deduplicated together resulting in incorrect backtraces.