<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/105813>105813</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang-cl.exe 19.1.0 and 20.0.0 hangs non-deterministically
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          xyzzy12332
      </td>
    </tr>
</table>

<pre>
    My clang-cl.exe hangs for the following source code. In about 1 out of 10 runs the compilation is successful.

Environment: Windows 10 64-bit, Visual Studio 2022
Clang 19.1.0-rc2, prebuilt (LLVM-19.1.0-rc2-Windows-X64.tar.xz)
Clang 20.0.0, 64-bit, local debug build

`clang-cl.exe /nologo /MTd /EHa main.cxx`

------------------------------------------------------------------------------

[main.cxx]

```
#include <map>
#include <cassert>

void Foo (std::map<int,int> const &mapFoo,
          std::size_t const bar)
{
  auto cur = mapFoo.find(0);
  assert(bar>=0);
}

int main ()
{
 std::map<int,int> M;
  
  Foo (M, 7);
}
```

------------------------------------------------------------------------------

e:\test>clang-cl.exe /nologo /MTd /EHa main.cxx 
Assertion failed: !NodePtr->isKnownSentinel(), file E:\llvm\llvm-project\llvm\include\llvm/ADT/ilist_iterator.h, line 168
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: E:\\llvm\\20.0.0\\x86_64\\bin\\clang-cl.exe -cc1 -triple x86_64-pc-windows-msvc19.41.34120 -emit-obj -mincremental-linker-compatible -dumpdir a- -disable-free -clear-ast-before-backend -main-file-name main.cxx -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -fms-volatile -funwind-tables=2 -target-cpu x86-64 -mllvm -x86-asm-syntax=intel -tune-cpu generic -D_DEBUG -D_MT -flto-visibility-public-std --dependent-lib=libcmtd --dependent-lib=oldnames -stack-protector 2 -fcxx-exceptions -fexceptions -fasync-exceptions -fdiagnostics-format msvc -fdebug-compilation-dir=e:\\test -fcoverage-compilation-dir=e:\\test -resource-dir E:\\llvm\\20.0.0\\x86_64\\lib\\clang\\20 -internal-isystem E:\\llvm\\20.0.0\\x86_64\\lib\\clang\\20\\include -internal-isystem "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.41.34120\\include" -internal-isystem "C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.41.34120\\atlmfc\\include" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22000.0\\ucrt" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22000.0\\shared" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22000.0\\um" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22000.0\\winrt" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22000.0\\cppwinrt" -fdeprecated-macro -ferror-limit 19 -fno-use-cxa-atexit -fms-extensions -fms-compatibility -fms-compatibility-version=19.41.34120 -std=c++14 -fskip-odr-check-in-gmf -fdelayed-template-parsing -faddrsig -o c:\\Temp\\main-7df83c.obj -x c++ main.cxx
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'main.cxx'.
4.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@"?Foo@@YAXAEBV?$map@HHU?$less@H@std@@V?$allocator@U?$pair@$$CBHH@std@@@2@@std@@_K@Z"'
Exception Code: 0x80000003
 #0 0x00007ff6271432dc HandleAbort E:\llvm\llvm-project\llvm\lib\Support\Windows\Signals.inc:429:0
 #1 0x00007ffdbba98e05 (C:\WINDOWS\SYSTEM32\ucrtbased.dll+0xa8e05)
 #2 0x00007ffdbba9ab29 (C:\WINDOWS\SYSTEM32\ucrtbased.dll+0xaab29)
 #3 0x00007ffdbbaa094f (C:\WINDOWS\SYSTEM32\ucrtbased.dll+0xb094f)
 #4 0x00007ffdbba9e881 (C:\WINDOWS\SYSTEM32\ucrtbased.dll+0xae881)
 #5 0x00007ffdbbaa158f (C:\WINDOWS\SYSTEM32\ucrtbased.dll+0xb158f)
 #6 0x00007ff6212a4609 llvm::ilist_iterator<struct llvm::ilist_detail::node_options<class llvm::MachineInstr, 1, 1, void, 0, void>, 0, 0>::operator*(void) const E:\llvm\llvm-project\llvm\include\llvm\ADT\ilist_iterator.h:168:0
 #7 0x00007ff6212b1ec7 llvm::MachineInstrBundleIterator<class llvm::MachineInstr, 0>::operator*(void) const E:\llvm\llvm-project\llvm\include\llvm\CodeGen\MachineInstrBundleIterator.h:178:0
 #8 0x00007ff6298c137e llvm::SelectionDAGISel::reportIPToStateForBlocks(class llvm::MachineFunction *) E:\llvm\llvm-project\llvm\lib\CodeGen\SelectionDAG\SelectionDAGISel.cpp:1435:0
 #9 0x00007ff6298c3a04 llvm::SelectionDAGISel::SelectAllBasicBlocks(class llvm::Function const &) E:\llvm\llvm-project\llvm\lib\CodeGen\SelectionDAG\SelectionDAGISel.cpp:1857:0
#10 0x00007ff6298b4762 llvm::SelectionDAGISel::runOnMachineFunction(class llvm::MachineFunction &) E:\llvm\llvm-project\llvm\lib\CodeGen\SelectionDAG\SelectionDAGISel.cpp:614:0
#11 0x00007ff62466f30e `anonymous namespace'::X86DAGToDAGISel::runOnMachineFunction E:\llvm\llvm-project\llvm\lib\Target\X86\X86ISelDAGToDAG.cpp:191:0
#12 0x00007ff6298ca88d llvm::SelectionDAGISelLegacy::runOnMachineFunction(class llvm::MachineFunction &) E:\llvm\llvm-project\llvm\lib\CodeGen\SelectionDAG\SelectionDAGISel.cpp:374:0
#13 0x00007ff625954ab1 llvm::MachineFunctionPass::runOnFunction(class llvm::Function &) E:\llvm\llvm-project\llvm\lib\CodeGen\MachineFunctionPass.cpp:94:0
#14 0x00007ff62628c0f2 llvm::FPPassManager::runOnFunction(class llvm::Function &) E:\llvm\llvm-project\llvm\lib\IR\LegacyPassManager.cpp:1408:0
#15 0x00007ff62628c4e2 llvm::FPPassManager::runOnModule(class llvm::Module &) E:\llvm\llvm-project\llvm\lib\IR\LegacyPassManager.cpp:1454:0
#16 0x00007ff62628f358 `anonymous namespace'::MPPassManager::runOnModule E:\llvm\llvm-project\llvm\lib\IR\LegacyPassManager.cpp:1523:0
#17 0x00007ff626290279 llvm::legacy::PassManagerImpl::run(class llvm::Module &) E:\llvm\llvm-project\llvm\lib\IR\LegacyPassManager.cpp:541:0
#18 0x00007ff62628553c llvm::legacy::PassManager::run(class llvm::Module &) E:\llvm\llvm-project\llvm\lib\IR\LegacyPassManager.cpp:1651:0
#19 0x00007ff627ba3166 `anonymous namespace'::EmitAssemblyHelper::RunCodegenPipeline E:\llvm\llvm-project\clang\lib\CodeGen\BackendUtil.cpp:1152:0
#20 0x00007ff627ba3777 `anonymous namespace'::EmitAssemblyHelper::EmitAssembly E:\llvm\llvm-project\clang\lib\CodeGen\BackendUtil.cpp:1174:0
#21 0x00007ff627b9ef09 clang::EmitBackendOutput(class clang::DiagnosticsEngine &, class clang::HeaderSearchOptions const &, class clang::CodeGenOptions const &, class clang::TargetOptions const &, class clang::LangOptions const &, class llvm::StringRef, class llvm::Module *, enum clang::BackendAction, class llvm::IntrusiveRefCntPtr<class llvm::vfs::FileSystem>, class std::unique_ptr<class llvm::raw_pwrite_stream, struct std::default_delete<class llvm::raw_pwrite_stream>>, class clang::BackendConsumer *) E:\llvm\llvm-project\clang\lib\CodeGen\BackendUtil.cpp:1335:0
#22 0x00007ff6287cef12 clang::BackendConsumer::HandleTranslationUnit(class clang::ASTContext &) E:\llvm\llvm-project\clang\lib\CodeGen\CodeGenAction.cpp:354:0
#23 0x00007ff62d31de05 clang::ParseAST(class clang::Sema &, bool, bool) E:\llvm\llvm-project\clang\lib\Parse\ParseAST.cpp:191:0
#24 0x00007ff628cc20d2 clang::ASTFrontendAction::ExecuteAction(void) E:\llvm\llvm-project\clang\lib\Frontend\FrontendAction.cpp:1192:0
#25 0x00007ff6287cc007 clang::CodeGenAction::ExecuteAction(void) E:\llvm\llvm-project\clang\lib\CodeGen\CodeGenAction.cpp:1144:0
#26 0x00007ff628cc19bf clang::FrontendAction::Execute(void) E:\llvm\llvm-project\clang\lib\Frontend\FrontendAction.cpp:1078:0
#27 0x00007ff628c80e36 clang::CompilerInstance::ExecuteAction(class clang::FrontendAction &) E:\llvm\llvm-project\clang\lib\Frontend\CompilerInstance.cpp:1061:0
#28 0x00007ff628f6ab85 clang::ExecuteCompilerInvocation(class clang::CompilerInstance *) E:\llvm\llvm-project\clang\lib\FrontendTool\ExecuteCompilerInvocation.cpp:280:0
#29 0x00007ff62120205d cc1_main(class llvm::ArrayRef<char const *>, char const *, void *) E:\llvm\llvm-project\clang\tools\driver\cc1_main.cpp:285:0
#30 0x00007ff6211ebcfe ExecuteCC1Tool E:\llvm\llvm-project\clang\tools\driver\driver.cpp:215:0
#31 0x00007ff6211ec513 clang_main(int, char **, struct llvm::ToolContext const &) E:\llvm\llvm-project\clang\tools\driver\driver.cpp:256:0
#32 0x00007ff621238096 main E:\llvm\build_vs17_x64\tools\clang\tools\driver\clang-driver.cpp:17:0
#33 0x00007ff631ee1279 invoke_main D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:79:0
#34 0x00007ff631ee1162 __scrt_common_main_seh D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288:0
#35 0x00007ff631ee101e __scrt_common_main D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:331:0
#36 0x00007ff631ee130e mainCRTStartup D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_main.cpp:17:0
#37 0x00007ffddf3c7374 (C:\WINDOWS\System32\KERNEL32.DLL+0x17374)
#38 0x00007ffde011cc91 (C:\WINDOWS\SYSTEM32\ntdll.dll+0x4cc91)
clang-cl: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 20.0.0git (https://github.com/llvm/llvm-project.git 27e5f505e5eee3da27c1515d6ed95d66fbe543ea)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: E:\llvm\20.0.0\x86_64\bin
Build config: +unoptimized, +assertions
clang-cl: note: diagnostic msg: 
********************

</pre>
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