add check for build id by lievenhey · Pull Request #24 · KDAB/perfparser

lievenhey · 2022-05-09T11:11:54Z

when searching in extra path, ... the build id is not checked which
could lead to problems while creating a backtrace.

This patch add a check for the build id in appPath and extraLibPaths

lievenhey · 2022-10-11T09:22:16Z

I am not sure if I used the qScopeGuard correctly. But based on the output of

#include <QCoreApplication>
#include <QScopeGuard>
#include <iostream>

struct Obj {
    Obj() {std::cout << "ctor" << std::endl;}
    ~Obj() {std::cout << "dtor" << std::endl;}
};

Obj test() {
    auto t = qScopeGuard([]{std::cout << "test" << std::endl;});

    return Obj();
}

int main(int argc, char *argv[])
{
    auto q = test();
    std::cout << "end" << std::endl;

    return 0;
}

ctor
test
end
dtor

I assume I did it correctly.

dfaure-kdab · 2022-10-11T11:21:38Z

I am not sure if I used the qScopeGuard correctly. But based on the output of
I assume I did it correctly.

The creation/deletion of one or more Obj instances in this code depends on the C++ version (guaranteed copy elision in C++17) and on the RVO optimization...

Add if (argc>1) return Obj(another_param); and you'll get a different result, even if argc==1, because this will disable RVO...

dfaure-kdab · 2022-10-11T11:29:23Z

OK in practice I can't really write a testcase that leads to a different result though :-)

milianw

usage of qScopeGuard is fine in your code, the QByteArray will be constructed and then copy the data before the guard gets destroyed and thus calls elf_end

app/perfsymboltable.cpp

applied changes

milianw

lgtm, thanks

when searching in extra path, ... the build id is not checked which could lead to problems while creating a backtrace. This patch add a check for the build id in appPath and extraLibPaths

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 #1 0x5d085ec67e4f in QArrayDataPointer<char>::swap(QArrayDataPointer<char>&) /usr/include/qt6/QtCore/qarraydatapointer.h:131 #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 #4 0x5d085ef0ca5c in CuDieRangeMapping::dieName(Dwarf_Die*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:364 #5 0x5d085ee36e7c in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:768 #6 0x5d085ee39eea in PerfSymbolTable::lookupFrame(unsigned long, bool, bool*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:774 #7 0x5d085ed06ec5 in frameCallback /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:541 #8 0x75a7437f7b08 in dwfl_thread_getframes (/usr/lib/libdw.so.1+0x5bb08) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #9 0x75a7437f2eba (/usr/lib/libdw.so.1+0x56eba) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #10 0x75a7437f3f2b in dwfl_getthreads (/usr/lib/libdw.so.1+0x57f2b) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #11 0x75a7437f7e81 in dwfl_getthread_frames (/usr/lib/libdw.so.1+0x5be81) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #12 0x5d085ed07b21 in PerfUnwind::unwindStack() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:557 #13 0x5d085ed0d129 in PerfUnwind::analyze(PerfRecordSample const&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:744 #14 0x5d085ed1b65f in PerfUnwind::flushEventBuffer(unsigned int) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:1115 #15 0x5d085ed164b1 in PerfUnwind::finishedRound() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:976 #16 0x5d085ecc2fe8 in PerfData::processEvents(QDataStream&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:243 #17 0x5d085eccbdc2 in PerfData::doRead() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:414 #18 0x5d085eccd6f3 in PerfData::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:431 #19 0x5d085ebfa511 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:383 #20 0x5d085ebfd5c6 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:452 #21 0x5d085ec0b9b9 in call /usr/include/qt6/QtCore/qobjectdefs_impl.h:137 #22 0x5d085ec0b121 in call<QtPrivate::List<>, void> /usr/include/qt6/QtCore/qobjectdefs_impl.h:345 #23 0x5d085ec0aa1e in impl /usr/include/qt6/QtCore/qobjectdefs_impl.h:555 #24 0x75a7429a3456 (/usr/lib/libQt6Core.so.6+0x1a3456) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #25 0x5d085ec33520 in PerfHeader::finished() /home/lieven/KDAB/hotspot/build-dev-asan-qt6/3rdparty/libhotspot-perfparser_autogen/6F7ISLN55V/moc_perfheader.cpp:234 #26 0x5d085ec5d91c in PerfHeader::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfheader.cpp:122 #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 #28 0x5d085ec2e24a in void QtPrivate::FunctionPointer<void (PerfHeader::*)()>::call<QtPrivate::List<>, void>(void (PerfHeader::*)(), PerfHeader*, void**) /usr/include/qt6/QtCore/qobjectdefs_impl.h:182 #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 #30 0x75a74298d93e in QObject::event(QEvent*) (/usr/lib/libQt6Core.so.6+0x18d93e) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #31 0x75a742945bc2 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (/usr/lib/libQt6Core.so.6+0x145bc2) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #32 0x75a742945faa in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (/usr/lib/libQt6Core.so.6+0x145faa) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #33 0x75a742babe4b (/usr/lib/libQt6Core.so.6+0x3abe4b) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #34 0x75a740d13558 (/usr/lib/libglib-2.0.so.0+0x5d558) (BuildId: 7b781c8d1a6e2161838c5d8f3bd797797c132753) #35 0x75a740d76156 (/usr/lib/libglib-2.0.so.0+0xc0156) (BuildId: 7b781c8d1a6e2161838c5d8f3bd797797c132753) #36 0x75a740d12a54 in g_main_context_iteration (/usr/lib/libglib-2.0.so.0+0x5ca54) (BuildId: 7b781c8d1a6e2161838c5d8f3bd797797c132753) #37 0x75a742ba985c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (/usr/lib/libQt6Core.so.6+0x3a985c) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #38 0x75a742950105 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (/usr/lib/libQt6Core.so.6+0x150105) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #39 0x75a74294a27c in QCoreApplication::exec() (/usr/lib/libQt6Core.so.6+0x14a27c) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #40 0x5d085ec04e44 in main /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:481 #41 0x75a741a34e07 (/usr/lib/libc.so.6+0x25e07) (BuildId: 98b3d8e0b8c534c769cb871c438b4f8f3a8e4bf3) #42 0x75a741a34ecb in __libc_start_main (/usr/lib/libc.so.6+0x25ecb) (BuildId: 98b3d8e0b8c534c769cb871c438b4f8f3a8e4bf3) #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 #1 0x5d085ef2c5af in QHashPrivate::Span<QHashPrivate::Node<unsigned long, QByteArray> >::addStorage() /usr/include/qt6/QtCore/qhash.h:409 #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 #4 0x5d085ef18c64 in QHashPrivate::Data<QHashPrivate::Node<unsigned long, QByteArray> >::findOrInsert(unsigned long const&) /usr/include/qt6/QtCore/qhash.h:728 #5 0x5d085ef1551a in QHash<unsigned long, QByteArray>::operator[](unsigned long const&) /usr/include/qt6/QtCore/qhash.h:1064 #6 0x5d085ef08e30 in prependScopeNames(QByteArray&, Dwarf_Die*, QHash<unsigned long, QByteArray>&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:204 #7 0x5d085ef0965b in qualifiedDieName(Dwarf_Die*, QHash<unsigned long, QByteArray>&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:229 #8 0x5d085ef0c9b8 in CuDieRangeMapping::dieName(Dwarf_Die*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:364 #9 0x5d085ee36e7c in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:768 #10 0x5d085ee39eea in PerfSymbolTable::lookupFrame(unsigned long, bool, bool*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:774 #11 0x5d085ed06ec5 in frameCallback /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:541 #12 0x75a7437f7b08 in dwfl_thread_getframes (/usr/lib/libdw.so.1+0x5bb08) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #13 0x75a7437f2eba (/usr/lib/libdw.so.1+0x56eba) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #14 0x75a7437f3f2b in dwfl_getthreads (/usr/lib/libdw.so.1+0x57f2b) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #15 0x75a7437f7e81 in dwfl_getthread_frames (/usr/lib/libdw.so.1+0x5be81) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #16 0x5d085ed07b21 in PerfUnwind::unwindStack() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:557 #17 0x5d085ed0d129 in PerfUnwind::analyze(PerfRecordSample const&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:744 #18 0x5d085ed1b65f in PerfUnwind::flushEventBuffer(unsigned int) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:1115 #19 0x5d085ed164b1 in PerfUnwind::finishedRound() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:976 #20 0x5d085ecc2fe8 in PerfData::processEvents(QDataStream&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:243 #21 0x5d085eccbdc2 in PerfData::doRead() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:414 #22 0x5d085eccd6f3 in PerfData::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:431 #23 0x5d085ebfa511 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:383 #24 0x5d085ebfd5c6 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:452 #25 0x5d085ec0b9b9 in call /usr/include/qt6/QtCore/qobjectdefs_impl.h:137 #26 0x5d085ec0b121 in call<QtPrivate::List<>, void> /usr/include/qt6/QtCore/qobjectdefs_impl.h:345 #27 0x5d085ec0aa1e in impl /usr/include/qt6/QtCore/qobjectdefs_impl.h:555 #28 0x75a7429a3456 (/usr/lib/libQt6Core.so.6+0x1a3456) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #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 #1 0x5d085ef2c181 in QHashPrivate::Span<QHashPrivate::Node<unsigned long, QByteArray> >::addStorage() /usr/include/qt6/QtCore/qhash.h:394 #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 #4 0x5d085ef18c64 in QHashPrivate::Data<QHashPrivate::Node<unsigned long, QByteArray> >::findOrInsert(unsigned long const&) /usr/include/qt6/QtCore/qhash.h:728 #5 0x5d085ef1551a in QHash<unsigned long, QByteArray>::operator[](unsigned long const&) /usr/include/qt6/QtCore/qhash.h:1064 #6 0x5d085ef0c883 in CuDieRangeMapping::dieName(Dwarf_Die*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdwarfdiecache.cpp:362 #7 0x5d085ee36e7c in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:768 #8 0x5d085ee39eea in PerfSymbolTable::lookupFrame(unsigned long, bool, bool*) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfsymboltable.cpp:774 #9 0x5d085ed06ec5 in frameCallback /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:541 #10 0x75a7437f7b08 in dwfl_thread_getframes (/usr/lib/libdw.so.1+0x5bb08) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #11 0x75a7437f2eba (/usr/lib/libdw.so.1+0x56eba) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #12 0x75a7437f3f2b in dwfl_getthreads (/usr/lib/libdw.so.1+0x57f2b) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #13 0x75a7437f7e81 in dwfl_getthread_frames (/usr/lib/libdw.so.1+0x5be81) (BuildId: 9b3f42d0dd4107f1cd947702b04157dad2a9069a) #14 0x5d085ed07b21 in PerfUnwind::unwindStack() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:557 #15 0x5d085ed0d129 in PerfUnwind::analyze(PerfRecordSample const&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:744 #16 0x5d085ed1b65f in PerfUnwind::flushEventBuffer(unsigned int) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:1115 #17 0x5d085ed164b1 in PerfUnwind::finishedRound() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfunwind.cpp:976 #18 0x5d085ecc2fe8 in PerfData::processEvents(QDataStream&) /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:243 #19 0x5d085eccbdc2 in PerfData::doRead() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:414 #20 0x5d085eccd6f3 in PerfData::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfdata.cpp:431 #21 0x5d085ebfa511 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:383 #22 0x5d085ebfd5c6 in operator() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/main.cpp:452 #23 0x5d085ec0b9b9 in call /usr/include/qt6/QtCore/qobjectdefs_impl.h:137 #24 0x5d085ec0b121 in call<QtPrivate::List<>, void> /usr/include/qt6/QtCore/qobjectdefs_impl.h:345 #25 0x5d085ec0aa1e in impl /usr/include/qt6/QtCore/qobjectdefs_impl.h:555 #26 0x75a7429a3456 (/usr/lib/libQt6Core.so.6+0x1a3456) (BuildId: 2dc7cac262eec1f545dffaf6727f87faf910fb09) #27 0x5d085ec33520 in PerfHeader::finished() /home/lieven/KDAB/hotspot/build-dev-asan-qt6/3rdparty/libhotspot-perfparser_autogen/6F7ISLN55V/moc_perfheader.cpp:234 #28 0x5d085ec5d91c in PerfHeader::read() /home/lieven/KDAB/hotspot/3rdparty/perfparser/app/perfheader.cpp:122 #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

milianw force-pushed the hotspot branch from 3ba75e0 to 64a75a9 Compare June 6, 2022 21:54

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lievenhey force-pushed the check-build-id branch from 143d32a to e83360d Compare October 14, 2022 09:17

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lievenhey force-pushed the check-build-id branch from e83360d to 84ff60c Compare October 18, 2022 10:02

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milianw force-pushed the hotspot branch from a9c09c7 to b455d40 Compare November 27, 2022 21:05

lievenhey force-pushed the check-build-id branch from 84ff60c to dbed2f5 Compare April 20, 2023 13:17

add check for build id

9e6b51c

when searching in extra path, ... the build id is not checked which could lead to problems while creating a backtrace. This patch add a check for the build id in appPath and extraLibPaths

lievenhey force-pushed the check-build-id branch from dbed2f5 to 9e6b51c Compare April 20, 2023 13:17

milianw merged commit 6c40b4f into hotspot May 23, 2023

milianw deleted the check-build-id branch May 23, 2023 09:15

lievenhey mentioned this pull request Oct 11, 2024

feat: fix crash in qt6 #35

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add check for build id#24

add check for build id#24
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lievenhey commented May 9, 2022

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lievenhey commented May 9, 2022

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