Invalid iterator dereference in v8::internal::compiler::JSHeapBroker::ProcessFeedbackMapsForElementAccess
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Audrius Butkevicius
Jun 25, 2025, 8:11:08 AMJun 25
to v8-dev
Hi
I'm running my application in debug mode, and I noticed it sometimes it fails with his assert:
C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.43.34808\include\vector(280) : Assertion failed: can't dereference out of range vector iterator
...
3 # `DllMain'::`5'::<lambda_1>::operator() at dllmain.cpp:598 (app+0x371a7cd)
4 # `DllMain'::`5'::<lambda_1>::<lambda_invoker_cdecl> at dllmain.cpp:614 (app+0x371a668)
5 # _VCrtDbgReportA at dbgrptt.cpp:391 (app+0x361df8f)
6 # _CrtDbgReport at dbgrpt.cpp:263 (app+0x35ee779)
7 # std::_Vector_iterator<std::_Vector_val<std::_Simple_types<std::pair<int,v8::internal::Tagged<v8::internal::HeapObject> > > > >::operator-> in app+0x92054c
8 # v8::MemorySpan<v8::internal::Handle<v8::internal::Map> >::to_address<std::_Vector_iterator<std::_Vector_val<std::_Simple_types<v8::internal::Handle<v8::internal::Map> > > >,void> in app+0x10e5643
9 # v8::MemorySpan<v8::internal::Handle<v8::internal::Map> >::MemorySpan<v8::internal::Handle<v8::internal::Map> ><std::_Vector_iterator<std::_Vector_val<std::_Simple_types<v8::internal::Handle<v8::internal::Map> > > >,1> in app+0x10e50c4
10 # v8::internal::compiler::JSHeapBroker::ProcessFeedbackMapsForElementAccess in app+0x251e77a
11 # v8::internal::compiler::JSHeapBroker::ReadFeedbackForPropertyAccess in app+0x2520011
12 # v8::internal::compiler::JSHeapBroker::GetFeedbackForPropertyAccess in app+0x251af78
13 # v8::internal::maglev::MaglevGraphBuilder::VisitStaInArrayLiteral in app+0x2862834
14 # v8::internal::maglev::MaglevGraphBuilder::VisitSingleBytecode in app+0x2343e8f
15 # v8::internal::maglev::MaglevGraphBuilder::BuildBody in app+0x230b567
16 # v8::internal::maglev::MaglevGraphBuilder::Build in app+0x230b385
17 # v8::internal::maglev::MaglevCompiler::Compile in app+0x230bd91
18 # v8::internal::maglev::MaglevCompilationJob::ExecuteJobImpl in app+0xfe89b8
19 # v8::internal::OptimizedCompilationJob::ExecuteJob in app+0xb0583b
20 # v8::internal::maglev::MaglevConcurrentDispatcher::JobTask::Run in app+0xfe9c23
21 # v8::platform::DefaultJobWorker::Run in app+0xd2a949
22 # v8::platform::DefaultWorkerThreadsTaskRunner::WorkerThread::Run in app+0xd2b1c2
23 # v8::base::Thread::NotifyStartedAndRun in app+0x681104
24 # v8::base::OS::StrNCpy in app+0x681e4d
25 # thread_start<unsigned int (__cdecl*)(void *),1> at thread.cpp:97 (app+0x3622e45)
26 # BaseThreadInitThunk in KERNEL32+0x17374
27 # RtlUserThreadStart in ntdll+0x4cc91
...
3 # `DllMain'::`5'::<lambda_1>::operator() at dllmain.cpp:598 (app+0x371a7cd)
4 # `DllMain'::`5'::<lambda_1>::<lambda_invoker_cdecl> at dllmain.cpp:614 (app+0x371a668)
5 # _VCrtDbgReportA at dbgrptt.cpp:391 (app+0x361df8f)
6 # _CrtDbgReport at dbgrpt.cpp:263 (app+0x35ee779)
7 # std::_Vector_iterator<std::_Vector_val<std::_Simple_types<std::pair<int,v8::internal::Tagged<v8::internal::HeapObject> > > > >::operator-> in app+0x92054c
8 # v8::MemorySpan<v8::internal::Handle<v8::internal::Map> >::to_address<std::_Vector_iterator<std::_Vector_val<std::_Simple_types<v8::internal::Handle<v8::internal::Map> > > >,void> in app+0x10e5643
9 # v8::MemorySpan<v8::internal::Handle<v8::internal::Map> >::MemorySpan<v8::internal::Handle<v8::internal::Map> ><std::_Vector_iterator<std::_Vector_val<std::_Simple_types<v8::internal::Handle<v8::internal::Map> > > >,1> in app+0x10e50c4
10 # v8::internal::compiler::JSHeapBroker::ProcessFeedbackMapsForElementAccess in app+0x251e77a
11 # v8::internal::compiler::JSHeapBroker::ReadFeedbackForPropertyAccess in app+0x2520011
12 # v8::internal::compiler::JSHeapBroker::GetFeedbackForPropertyAccess in app+0x251af78
13 # v8::internal::maglev::MaglevGraphBuilder::VisitStaInArrayLiteral in app+0x2862834
14 # v8::internal::maglev::MaglevGraphBuilder::VisitSingleBytecode in app+0x2343e8f
15 # v8::internal::maglev::MaglevGraphBuilder::BuildBody in app+0x230b567
16 # v8::internal::maglev::MaglevGraphBuilder::Build in app+0x230b385
17 # v8::internal::maglev::MaglevCompiler::Compile in app+0x230bd91
18 # v8::internal::maglev::MaglevCompilationJob::ExecuteJobImpl in app+0xfe89b8
19 # v8::internal::OptimizedCompilationJob::ExecuteJob in app+0xb0583b
20 # v8::internal::maglev::MaglevConcurrentDispatcher::JobTask::Run in app+0xfe9c23
21 # v8::platform::DefaultJobWorker::Run in app+0xd2a949
22 # v8::platform::DefaultWorkerThreadsTaskRunner::WorkerThread::Run in app+0xd2b1c2
23 # v8::base::Thread::NotifyStartedAndRun in app+0x681104
24 # v8::base::OS::StrNCpy in app+0x681e4d
25 # thread_start<unsigned int (__cdecl*)(void *),1> at thread.cpp:97 (app+0x3622e45)
26 # BaseThreadInitThunk in KERNEL32+0x17374
27 # RtlUserThreadStart in ntdll+0x4cc91
It's possible that I'm doing something wrong, but it's not very clear what.
Sadly, this is version 12.9.202, as I still need a static build that uses MSVC.
Any suggestions would be welcome, as to what I'm doing wrong.
Thanks.
Ben Noordhuis
Jun 25, 2025, 8:55:06 AMJun 25
to v8-...@googlegroups.com
disabled until at least 12.8 because of various crashes.
Audrius Butkevicius
Jun 25, 2025, 12:16:00 PMJun 25
to v8-dev
I've actually posted stacktraces of other threads on the user list (https://groups.google.com/g/v8-users/c/iaD_4IGqIyI) which hints this is a race condition.
Seems that the code on head hasn't changed around this, so it still might be a bug now, but confirmed, the issue goes away by switching off maglev.
Audrius Butkevicius
Jun 25, 2025, 3:57:43 PMJun 25
to v8-dev
Seems that I've hit the same case without Maglev:
==== C stack trace ===============================
std::_Vector_iterator<std::_Vector_val<std::_Simple_types<std::pair<int,v8::internal::Tagged<v8::internal::HeapObject> > > > >::operator-> [0x00007FFB8C978EB1+369]
v8::MemorySpan<v8::internal::Handle<v8::internal::Map> >::to_address<std::_Vector_iterator<std::_Vector_val<std::_Simple_types<v8::internal::Handle<v8::internal::Map> > > >,void> [0x00007FFB8D13EC83+19]
v8::MemorySpan<v8::internal::Handle<v8::internal::Map> >::MemorySpan<v8::internal::Handle<v8::internal::Map> ><std::_Vector_iterator<std::_Vector_val<std::_Simple_types<v8::internal::Handle<v8::internal::Map> > > >,1> [0x00007FFB8D13E704+52]
v8::internal::compiler::JSHeapBroker::ProcessFeedbackMapsForElementAccess [0x00007FFB8E57704A+714]
v8::internal::compiler::JSHeapBroker::ReadFeedbackForPropertyAccess [0x00007FFB8E5788E1+1841]
v8::internal::compiler::JSHeapBroker::GetFeedbackForPropertyAccess [0x00007FFB8E573848+88]
v8::internal::compiler::JSNativeContextSpecialization::ReducePropertyAccess [0x00007FFB8EB83319+681]
v8::internal::compiler::JSNativeContextSpecialization::ReduceJSSetKeyedProperty [0x00007FFB8EB7EF21+321]
v8::internal::compiler::JSNativeContextSpecialization::Reduce [0x00007FFB8EB73019+649]
v8::internal::compiler::Reducer::Reduce [0x00007FFB8E93D1EC+60]
v8::internal::compiler::GraphReducer::Reduce [0x00007FFB8E93CEBE+190]
v8::internal::compiler::GraphReducer::ReduceTop [0x00007FFB8E93D708+600]
v8::internal::compiler::GraphReducer::ReduceNode [0x00007FFB8E93D32E+174]
v8::internal::compiler::GraphReducer::ReduceGraph [0x00007FFB8E93D278+40]
v8::internal::compiler::InliningPhase::Run [0x00007FFB8E4E7CBE+1950]
v8::internal::compiler::PipelineImpl::Run<v8::internal::compiler::InliningPhase> [0x00007FFB8E49B71B+123]
v8::internal::compiler::PipelineImpl::CreateGraph [0x00007FFB8E4D03C8+168]
v8::internal::compiler::PipelineCompilationJob::ExecuteJobImpl [0x00007FFB8E4D205C+428]
v8::internal::OptimizedCompilationJob::ExecuteJob [0x00007FFB8CB5E11B+299]
v8::internal::OptimizingCompileDispatcher::CompileNext [0x00007FFB8D0390A3+67]
v8::internal::OptimizingCompileDispatcher::CompileTask::Run [0x00007FFB8D03A2F9+633]
v8::platform::DefaultJobWorker::Run [0x00007FFB8CD835F9+185]
v8::platform::DefaultWorkerThreadsTaskRunner::WorkerThread::Run [0x00007FFB8CD83E72+194]
v8::base::Thread::NotifyStartedAndRun [0x00007FFB8C6D8904+52]
v8::base::OS::StrNCpy [0x00007FFB8C6D964D+205]
thread_start<unsigned int (__cdecl*)(void *),1> [0x00007FFB8F67B6B5+165] (minkernel\crts\ucrt\src\appcrt\startup\thread.cpp:97)
BaseThreadInitThunk [0x00007FFCBDDA7374+20]
RtlUserThreadStart [0x00007FFCBFDBCC91+33]
std::_Vector_iterator<std::_Vector_val<std::_Simple_types<std::pair<int,v8::internal::Tagged<v8::internal::HeapObject> > > > >::operator-> [0x00007FFB8C978EB1+369]
v8::MemorySpan<v8::internal::Handle<v8::internal::Map> >::to_address<std::_Vector_iterator<std::_Vector_val<std::_Simple_types<v8::internal::Handle<v8::internal::Map> > > >,void> [0x00007FFB8D13EC83+19]
v8::MemorySpan<v8::internal::Handle<v8::internal::Map> >::MemorySpan<v8::internal::Handle<v8::internal::Map> ><std::_Vector_iterator<std::_Vector_val<std::_Simple_types<v8::internal::Handle<v8::internal::Map> > > >,1> [0x00007FFB8D13E704+52]
v8::internal::compiler::JSHeapBroker::ProcessFeedbackMapsForElementAccess [0x00007FFB8E57704A+714]
v8::internal::compiler::JSHeapBroker::ReadFeedbackForPropertyAccess [0x00007FFB8E5788E1+1841]
v8::internal::compiler::JSHeapBroker::GetFeedbackForPropertyAccess [0x00007FFB8E573848+88]
v8::internal::compiler::JSNativeContextSpecialization::ReducePropertyAccess [0x00007FFB8EB83319+681]
v8::internal::compiler::JSNativeContextSpecialization::ReduceJSSetKeyedProperty [0x00007FFB8EB7EF21+321]
v8::internal::compiler::JSNativeContextSpecialization::Reduce [0x00007FFB8EB73019+649]
v8::internal::compiler::Reducer::Reduce [0x00007FFB8E93D1EC+60]
v8::internal::compiler::GraphReducer::Reduce [0x00007FFB8E93CEBE+190]
v8::internal::compiler::GraphReducer::ReduceTop [0x00007FFB8E93D708+600]
v8::internal::compiler::GraphReducer::ReduceNode [0x00007FFB8E93D32E+174]
v8::internal::compiler::GraphReducer::ReduceGraph [0x00007FFB8E93D278+40]
v8::internal::compiler::InliningPhase::Run [0x00007FFB8E4E7CBE+1950]
v8::internal::compiler::PipelineImpl::Run<v8::internal::compiler::InliningPhase> [0x00007FFB8E49B71B+123]
v8::internal::compiler::PipelineImpl::CreateGraph [0x00007FFB8E4D03C8+168]
v8::internal::compiler::PipelineCompilationJob::ExecuteJobImpl [0x00007FFB8E4D205C+428]
v8::internal::OptimizedCompilationJob::ExecuteJob [0x00007FFB8CB5E11B+299]
v8::internal::OptimizingCompileDispatcher::CompileNext [0x00007FFB8D0390A3+67]
v8::internal::OptimizingCompileDispatcher::CompileTask::Run [0x00007FFB8D03A2F9+633]
v8::platform::DefaultJobWorker::Run [0x00007FFB8CD835F9+185]
v8::platform::DefaultWorkerThreadsTaskRunner::WorkerThread::Run [0x00007FFB8CD83E72+194]
v8::base::Thread::NotifyStartedAndRun [0x00007FFB8C6D8904+52]
v8::base::OS::StrNCpy [0x00007FFB8C6D964D+205]
thread_start<unsigned int (__cdecl*)(void *),1> [0x00007FFB8F67B6B5+165] (minkernel\crts\ucrt\src\appcrt\startup\thread.cpp:97)
BaseThreadInitThunk [0x00007FFCBDDA7374+20]
RtlUserThreadStart [0x00007FFCBFDBCC91+33]
I suspect this thread is what triggered it:
0 # NtWaitForAlertByThreadId in ntdll+0xa0f24
1 # RtlAcquireSRWLockExclusive in ntdll+0x29205
2 # v8::base::SharedMutex::LockExclusive in app+0x59258f
3 # `v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2>::operator() in app+0xea0a99
4 # v8::internal::LocalHeap::ParkAndExecuteCallback<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> > in app+0xe9f7c8
5 # `v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> >'::`2'::<lambda_1>::operator() in app+0xea0749
6 # heap::base::Stack::SetMarkerAndCallbackImpl<`v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> >'::`2'::<lambda_1> > in app+0xe9f99b
7 # PushAllRegistersAndIterateStack in app+0xf65abd
8 # heap::base::Stack::TrampolineCallbackHelper in app+0x7f3737
9 # heap::base::Stack::SetMarkerAndCallback<`v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> >'::`2'::<lambda_1> > in app+0xe9f8d4
10 # v8::internal::LocalHeap::ExecuteWithStackMarker<`v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> >'::`2'::<lambda_1> > in app+0xe9edfe
11 # v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> > in app+0xe9ec55
12 # v8::internal::ParkedSharedMutexGuardIf<0,0>::ParkedSharedMutexGuardIf<0,0> in app+0xea01dd
13 # v8::internal::ParkedSharedMutexGuardIf<0,0>::ParkedSharedMutexGuardIf<0,0> in app+0xea022a
14 # v8::internal::MapUpdater::ReconfigureToDataField in app+0xeaaa4d
15 # v8::internal::Map::Update in app+0x80f4c7
16 # v8::internal::Map::TransitionToDataProperty in app+0x80cf20
17 # v8::internal::LookupIterator::PrepareTransitionToDataProperty in app+0x9d3cc5
18 # v8::internal::Object::TransitionAndWriteDataProperty in app+0x642167
19 # v8::internal::Object::AddDataProperty in app+0x5fc92e
20 # v8::internal::JSObject::DefineOwnPropertyIgnoreAttributes in app+0x754a99
21 # v8::internal::JSObject::DefineOwnPropertyIgnoreAttributes in app+0x754b5e
22 # v8::internal::JSObject::SetOwnPropertyIgnoreAttributes in app+0x778e02
23 # v8::internal::CastTraits<v8::internal::ObjectBoilerplateDescription>::AllowFrom in app+0x1fd8252
24 # v8::internal::CastTraits<v8::internal::ObjectBoilerplateDescription>::AllowFrom in app+0x1fd6f4a
25 # v8::internal::Cast<v8::internal::ObjectBoilerplateDescription,v8::internal::Object> in app+0x1fd6c66
26 # v8::internal::Cast<v8::internal::ObjectBoilerplateDescription,v8::internal::Object> in app+0x1fd65d7
27 # v8::internal::AllocationSiteUsageContext::ShouldCreateMemento in app+0x1fe14a8
28 # v8::internal::Runtime_CreateObjectLiteral in app+0x1fd93b4
1 # RtlAcquireSRWLockExclusive in ntdll+0x29205
2 # v8::base::SharedMutex::LockExclusive in app+0x59258f
3 # `v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2>::operator() in app+0xea0a99
4 # v8::internal::LocalHeap::ParkAndExecuteCallback<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> > in app+0xe9f7c8
5 # `v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> >'::`2'::<lambda_1>::operator() in app+0xea0749
6 # heap::base::Stack::SetMarkerAndCallbackImpl<`v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> >'::`2'::<lambda_1> > in app+0xe9f99b
7 # PushAllRegistersAndIterateStack in app+0xf65abd
8 # heap::base::Stack::TrampolineCallbackHelper in app+0x7f3737
9 # heap::base::Stack::SetMarkerAndCallback<`v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> >'::`2'::<lambda_1> > in app+0xe9f8d4
10 # v8::internal::LocalHeap::ExecuteWithStackMarker<`v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> >'::`2'::<lambda_1> > in app+0xe9edfe
11 # v8::internal::LocalHeap::ExecuteWhileParked<`v8::internal::ParkedSharedMutexGuardIf<1,0>::ParkedSharedMutexGuardIf<1,0>'::`25'::<lambda_2> > in app+0xe9ec55
12 # v8::internal::ParkedSharedMutexGuardIf<0,0>::ParkedSharedMutexGuardIf<0,0> in app+0xea01dd
13 # v8::internal::ParkedSharedMutexGuardIf<0,0>::ParkedSharedMutexGuardIf<0,0> in app+0xea022a
14 # v8::internal::MapUpdater::ReconfigureToDataField in app+0xeaaa4d
15 # v8::internal::Map::Update in app+0x80f4c7
16 # v8::internal::Map::TransitionToDataProperty in app+0x80cf20
17 # v8::internal::LookupIterator::PrepareTransitionToDataProperty in app+0x9d3cc5
18 # v8::internal::Object::TransitionAndWriteDataProperty in app+0x642167
19 # v8::internal::Object::AddDataProperty in app+0x5fc92e
20 # v8::internal::JSObject::DefineOwnPropertyIgnoreAttributes in app+0x754a99
21 # v8::internal::JSObject::DefineOwnPropertyIgnoreAttributes in app+0x754b5e
22 # v8::internal::JSObject::SetOwnPropertyIgnoreAttributes in app+0x778e02
23 # v8::internal::CastTraits<v8::internal::ObjectBoilerplateDescription>::AllowFrom in app+0x1fd8252
24 # v8::internal::CastTraits<v8::internal::ObjectBoilerplateDescription>::AllowFrom in app+0x1fd6f4a
25 # v8::internal::Cast<v8::internal::ObjectBoilerplateDescription,v8::internal::Object> in app+0x1fd6c66
26 # v8::internal::Cast<v8::internal::ObjectBoilerplateDescription,v8::internal::Object> in app+0x1fd65d7
27 # v8::internal::AllocationSiteUsageContext::ShouldCreateMemento in app+0x1fe14a8
28 # v8::internal::Runtime_CreateObjectLiteral in app+0x1fd93b4
Message has been deleted
Nikos Papaspyrou
Jun 26, 2025, 1:45:04 PMJun 26
to v8-dev
The problem arises at this point, when possible_transition_targets is empty.
It seems that the following program runs successfully with clang, both in Linux and Windows.
However, it fails with MSVC, exactly with the assertion failure that you're getting.
#include <cassert>
#include <vector>
int main() {
std::vector < int> empty;
assert(nullptr == empty.begin().operator->());
std::vector < int> empty;
assert(nullptr == empty.begin().operator->());
}
I will investigate some more and come back with a fix.
Thank you for reporting!
Audrius Butkevicius
Jun 27, 2025, 5:58:20 PMJun 27
to v8-dev
Presumably this:
just needs to be:
: data_(first == last ? nullptr : to_address(first)), size_(last - first) {}
: data_(first == last ? nullptr : to_address(first)), size_(last - first) {}
?
Nikos Papaspyrou
Jul 7, 2025, 5:47:58 AMJul 7
to v8-...@googlegroups.com
That would also work.
My fix is here: https://chromium-review.googlesource.com/c/v8/v8/+/6683301
My fix is here: https://chromium-review.googlesource.com/c/v8/v8/+/6683301
For earlier V8 versions, I'm afraid you will need to backpatch it.
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