[clang][analyzer] Crash of `unix.UnixAPIMisuseChecker` on a use of a custom-defined `getline`

[necto]

unix.UnixAPIMisuseChecker assumes the POSIX signature of getline function based on its name and tries to add an assumption about the pointer it takes. This leads to a crash if the target code uses a non-standard getline with different parameter types as in the following reduced example:

class MY_string {};
void getline(int *, MY_string);
void top() {
    MY_string line;
    int data;
    getline(&data, line);
}

See the stack trace on Compiler Explorer:

'Assume' not implemented for this NonLoc
UNREACHABLE executed at /root/llvm-project/clang/lib/StaticAnalyzer/Core/SimpleConstraintManager.cpp:68!
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: /opt/compiler-explorer/clang-assertions-20.1.0/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-14.2.0 -fcolor-diagnostics -fno-crash-diagnostics --analyze <source>
1.	<eof> parser at end of file
2.	While analyzing stack: 
	#0 Calling top()
3.	<source>:6:5: Error evaluating statement
4.	<source>:6:5: Error evaluating statement
 #0 0x0000000003e64af8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x3e64af8)
 #1 0x0000000003e627b4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x3e627b4)
 #2 0x0000000003daec88 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x000071efe5042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x000071efe50969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x000071efe5042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x000071efe50287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x0000000003dba5ea (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x3dba5ea)
 #8 0x00000000067c39ba clang::ento::SimpleConstraintManager::assumeAux(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::NonLoc, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x67c39ba)
 #9 0x00000000067c3d25 clang::ento::SimpleConstraintManager::assume(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::NonLoc, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x67c3d25)
#10 0x00000000067c3f4a clang::ento::SimpleConstraintManager::assumeInternal(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::DefinedSVal, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x67c3f4a)
#11 0x00000000066bac88 std::pair<llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>> clang::ento::ConstraintManager::assumeDualImpl<clang::ento::ConstraintManager::assumeDual(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::DefinedSVal)::'lambda'(bool)>(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>&, clang::ento::ConstraintManager::assumeDual(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::DefinedSVal)::'lambda'(bool)&) ConstraintManager.cpp:0:0
#12 0x00000000066baf39 clang::ento::ConstraintManager::assumeDual(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::DefinedSVal) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66baf39)
#13 0x0000000006612550 (anonymous namespace)::UnixAPIMisuseChecker::EnsurePtrNotNull(clang::ento::SVal, clang::Expr const*, clang::ento::CheckerContext&, llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, llvm::StringRef, std::optional<std::reference_wrapper<clang::ento::BugType const>>) const (.isra.0.constprop.0) UnixAPIChecker.cpp:0:0
#14 0x0000000006612ab5 void clang::ento::check::PreCall::_checkCall<(anonymous namespace)::UnixAPIMisuseChecker>(void*, clang::ento::CallEvent const&, clang::ento::CheckerContext&) UnixAPIChecker.cpp:0:0
#15 0x00000000066b52d9 void expandGraphWithCheckers<(anonymous namespace)::CheckCallContext>((anonymous namespace)::CheckCallContext, clang::ento::ExplodedNodeSet&, clang::ento::ExplodedNodeSet const&) CheckerManager.cpp:0:0
#16 0x00000000066b54aa clang::ento::CheckerManager::runCheckersForCallEvent(bool, clang::ento::ExplodedNodeSet&, clang::ento::ExplodedNodeSet const&, clang::ento::CallEvent const&, clang::ento::ExprEngine&, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66b54aa)
#17 0x000000000672b0f4 clang::ento::ExprEngine::evalCall(clang::ento::ExplodedNodeSet&, clang::ento::ExplodedNode*, clang::ento::CallEvent const&) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x672b0f4)
#18 0x000000000672c0d7 clang::ento::ExprEngine::VisitCallExpr(clang::CallExpr const*, clang::ento::ExplodedNode*, clang::ento::ExplodedNodeSet&) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x672c0d7)
#19 0x0000000006703e11 clang::ento::ExprEngine::Visit(clang::Stmt const*, clang::ento::ExplodedNode*, clang::ento::ExplodedNodeSet&) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x6703e11)
#20 0x0000000006704e3d clang::ento::ExprEngine::ProcessStmt(clang::Stmt const*, clang::ento::ExplodedNode*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x6704e3d)
#21 0x000000000670cf6a clang::ento::ExprEngine::processCFGElement(clang::CFGElement, clang::ento::ExplodedNode*, unsigned int, clang::ento::NodeBuilderContext*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x670cf6a)
#22 0x00000000066bfc4b clang::ento::CoreEngine::HandlePostStmt(clang::CFGBlock const*, unsigned int, clang::ento::ExplodedNode*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66bfc4b)
#23 0x00000000066c008b clang::ento::CoreEngine::dispatchWorkItem(clang::ento::ExplodedNode*, clang::ProgramPoint, clang::ento::WorkListUnit const&) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66c008b)
#24 0x00000000066c01ca clang::ento::CoreEngine::ExecuteWorkList(clang::LocationContext const*, unsigned int, llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66c01ca)
#25 0x00000000062e4f25 (anonymous namespace)::AnalysisConsumer::HandleCode(clang::Decl*, unsigned int, clang::ento::ExprEngine::InliningModes, llvm::DenseSet<clang::Decl const*, llvm::DenseMapInfo<clang::Decl const*, void>>*) AnalysisConsumer.cpp:0:0
#26 0x00000000062e6c3e (anonymous namespace)::AnalysisConsumer::HandleDeclsCallGraph(unsigned int) AnalysisConsumer.cpp:0:0
#27 0x00000000062e8354 (anonymous namespace)::AnalysisConsumer::HandleTranslationUnit(clang::ASTContext&) AnalysisConsumer.cpp:0:0
#28 0x000000000683fc7c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x683fc7c)
#29 0x0000000004abdd25 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4abdd25)
#30 0x0000000004a407de clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4a407de)
#31 0x0000000004babd8e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4babd8e)
#32 0x0000000000cfe40f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0xcfe40f)
#33 0x0000000000cf5e9a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#34 0x000000000483e749 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#35 0x0000000003daf134 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x3daf134)
#36 0x000000000483ed3f clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#37 0x0000000004801bad clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4801bad)
#38 0x0000000004802c2e clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4802c2e)
#39 0x000000000480a765 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x480a765)
#40 0x0000000000cfb213 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0xcfb213)
#41 0x0000000000bc3694 main (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0xbc3694)
#42 0x000071efe5029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#43 0x000071efe5029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#44 0x0000000000cf5945 _start (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0xcf5945)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

[llvmbot]

@llvm/issue-subscribers-clang-static-analyzer

Author: Arseniy Zaostrovnykh (necto)

`unix.UnixAPIMisuseChecker` assumes the POSIX signature of `getline` function based on its name and tries to add an assumption about the pointer it takes. This leads to a crash if the target code uses a non-standard `getline` with different parameter types as in the following reduced example: ```C++ class AW_string {}; void getline(int *, AW_string); void top() { AW_string line; int getline_file_info; getline(&getline_file_info, line); } ``` See the stack trace [on Compiler Explorer](https://compiler-explorer.com/#g:!((g:!((g:!((h:codeEditor,i:(filename:'1',fontScale:14,fontUsePx:'0',j:1,lang:c%2B%2B,selection:(endColumn:2,endLineNumber:7,positionColumn:1,positionLineNumber:1,selectionStartColumn:2,selectionStartLineNumber:7,startColumn:1,startLineNumber:1),source:'class+AW_string+%7B%7D%3B%0Avoid+getline(int+*,+AW_string)%3B%0Avoid+top()+%7B%0A++++AW_string+line%3B%0A++++int+getline_file_info%3B%0A++++getline(%26getline_file_info,+line)%3B%0A%7D'),l:'5',n:'0',o:'C%2B%2B+source+%231',t:'0')),k:50,l:'4',n:'0',o:'',s:0,t:'0'),(g:!((g:!((h:compiler,i:(compiler:clang201assert,filters:(b:'0',binary:'1',binaryObject:'1',commentOnly:'0',debugCalls:'1',demangle:'0',directives:'0',execute:'1',intel:'0',libraryCode:'0',trim:'1',verboseDemangling:'0'),flagsViewOpen:'1',fontScale:14,fontUsePx:'0',j:1,lang:c%2B%2B,libs:!(),options:'--analyze',overrides:!(),selection:(endColumn:1,endLineNumber:1,positionColumn:1,positionLineNumber:1,selectionStartColumn:1,selectionStartLineNumber:1,startColumn:1,startLineNumber:1),source:1),l:'5',n:'0',o:'+x86-64+clang+20.1.0+(assertions)+(Editor+%231)',t:'0')),header:(),l:'4',m:14.576635940294388,n:'0',o:'',s:0,t:'0'),(g:!((h:output,i:(compilerName:'x86-64+clang+20.1.0',editorid:1,fontScale:14,fontUsePx:'0',j:1,wrap:'1'),l:'5',n:'0',o:'Output+of+x86-64+clang+20.1.0+(assertions)+(Compiler+%231)',t:'0')),header:(),k:50,l:'4',m:85.4233640597056,n:'0',o:'',s:0,t:'0')),k:50,l:'3',n:'0',o:'',t:'0')),l:'2',n:'0',o:'',t:'0')),version:4):

'Assume' not implemented for this NonLoc
UNREACHABLE executed at /root/llvm-project/clang/lib/StaticAnalyzer/Core/SimpleConstraintManager.cpp:68!
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: /opt/compiler-explorer/clang-assertions-20.1.0/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-14.2.0 -fcolor-diagnostics -fno-crash-diagnostics --analyze <source>
1.	<eof> parser at end of file
2.	While analyzing stack: 
	#<!-- -->0 Calling top()
3.	&lt;source&gt;:6:5: Error evaluating statement
4.	&lt;source&gt;:6:5: Error evaluating statement
 #<!-- -->0 0x0000000003e64af8 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x3e64af8)
 #<!-- -->1 0x0000000003e627b4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x3e627b4)
 #<!-- -->2 0x0000000003daec88 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x000071efe5042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x000071efe50969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x000071efe5042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x000071efe50287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x0000000003dba5ea (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x3dba5ea)
 #<!-- -->8 0x00000000067c39ba clang::ento::SimpleConstraintManager::assumeAux(llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;, clang::ento::NonLoc, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x67c39ba)
 #<!-- -->9 0x00000000067c3d25 clang::ento::SimpleConstraintManager::assume(llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;, clang::ento::NonLoc, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x67c3d25)
#<!-- -->10 0x00000000067c3f4a clang::ento::SimpleConstraintManager::assumeInternal(llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;, clang::ento::DefinedSVal, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x67c3f4a)
#<!-- -->11 0x00000000066bac88 std::pair&lt;llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;, llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;&gt; clang::ento::ConstraintManager::assumeDualImpl&lt;clang::ento::ConstraintManager::assumeDual(llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;, clang::ento::DefinedSVal)::'lambda'(bool)&gt;(llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;&amp;, clang::ento::ConstraintManager::assumeDual(llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;, clang::ento::DefinedSVal)::'lambda'(bool)&amp;) ConstraintManager.cpp:0:0
#<!-- -->12 0x00000000066baf39 clang::ento::ConstraintManager::assumeDual(llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;, clang::ento::DefinedSVal) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66baf39)
#<!-- -->13 0x0000000006612550 (anonymous namespace)::UnixAPIMisuseChecker::EnsurePtrNotNull(clang::ento::SVal, clang::Expr const*, clang::ento::CheckerContext&amp;, llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;, llvm::StringRef, std::optional&lt;std::reference_wrapper&lt;clang::ento::BugType const&gt;&gt;) const (.isra.0.constprop.0) UnixAPIChecker.cpp:0:0
#<!-- -->14 0x0000000006612ab5 void clang::ento::check::PreCall::_checkCall&lt;(anonymous namespace)::UnixAPIMisuseChecker&gt;(void*, clang::ento::CallEvent const&amp;, clang::ento::CheckerContext&amp;) UnixAPIChecker.cpp:0:0
#<!-- -->15 0x00000000066b52d9 void expandGraphWithCheckers&lt;(anonymous namespace)::CheckCallContext&gt;((anonymous namespace)::CheckCallContext, clang::ento::ExplodedNodeSet&amp;, clang::ento::ExplodedNodeSet const&amp;) CheckerManager.cpp:0:0
#<!-- -->16 0x00000000066b54aa clang::ento::CheckerManager::runCheckersForCallEvent(bool, clang::ento::ExplodedNodeSet&amp;, clang::ento::ExplodedNodeSet const&amp;, clang::ento::CallEvent const&amp;, clang::ento::ExprEngine&amp;, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66b54aa)
#<!-- -->17 0x000000000672b0f4 clang::ento::ExprEngine::evalCall(clang::ento::ExplodedNodeSet&amp;, clang::ento::ExplodedNode*, clang::ento::CallEvent const&amp;) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x672b0f4)
#<!-- -->18 0x000000000672c0d7 clang::ento::ExprEngine::VisitCallExpr(clang::CallExpr const*, clang::ento::ExplodedNode*, clang::ento::ExplodedNodeSet&amp;) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x672c0d7)
#<!-- -->19 0x0000000006703e11 clang::ento::ExprEngine::Visit(clang::Stmt const*, clang::ento::ExplodedNode*, clang::ento::ExplodedNodeSet&amp;) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x6703e11)
#<!-- -->20 0x0000000006704e3d clang::ento::ExprEngine::ProcessStmt(clang::Stmt const*, clang::ento::ExplodedNode*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x6704e3d)
#<!-- -->21 0x000000000670cf6a clang::ento::ExprEngine::processCFGElement(clang::CFGElement, clang::ento::ExplodedNode*, unsigned int, clang::ento::NodeBuilderContext*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x670cf6a)
#<!-- -->22 0x00000000066bfc4b clang::ento::CoreEngine::HandlePostStmt(clang::CFGBlock const*, unsigned int, clang::ento::ExplodedNode*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66bfc4b)
#<!-- -->23 0x00000000066c008b clang::ento::CoreEngine::dispatchWorkItem(clang::ento::ExplodedNode*, clang::ProgramPoint, clang::ento::WorkListUnit const&amp;) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66c008b)
#<!-- -->24 0x00000000066c01ca clang::ento::CoreEngine::ExecuteWorkList(clang::LocationContext const*, unsigned int, llvm::IntrusiveRefCntPtr&lt;clang::ento::ProgramState const&gt;) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x66c01ca)
#<!-- -->25 0x00000000062e4f25 (anonymous namespace)::AnalysisConsumer::HandleCode(clang::Decl*, unsigned int, clang::ento::ExprEngine::InliningModes, llvm::DenseSet&lt;clang::Decl const*, llvm::DenseMapInfo&lt;clang::Decl const*, void&gt;&gt;*) AnalysisConsumer.cpp:0:0
#<!-- -->26 0x00000000062e6c3e (anonymous namespace)::AnalysisConsumer::HandleDeclsCallGraph(unsigned int) AnalysisConsumer.cpp:0:0
#<!-- -->27 0x00000000062e8354 (anonymous namespace)::AnalysisConsumer::HandleTranslationUnit(clang::ASTContext&amp;) AnalysisConsumer.cpp:0:0
#<!-- -->28 0x000000000683fc7c clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x683fc7c)
#<!-- -->29 0x0000000004abdd25 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4abdd25)
#<!-- -->30 0x0000000004a407de clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4a407de)
#<!-- -->31 0x0000000004babd8e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4babd8e)
#<!-- -->32 0x0000000000cfe40f cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0xcfe40f)
#<!-- -->33 0x0000000000cf5e9a ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->34 0x000000000483e749 void llvm::function_ref&lt;void ()&gt;::callback_fn&lt;clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const::'lambda'()&gt;(long) Job.cpp:0:0
#<!-- -->35 0x0000000003daf134 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x3daf134)
#<!-- -->36 0x000000000483ed3f clang::driver::CC1Command::Execute(llvm::ArrayRef&lt;std::optional&lt;llvm::StringRef&gt;&gt;, std::__cxx11::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt;&gt;*, bool*) const (.part.0) Job.cpp:0:0
#<!-- -->37 0x0000000004801bad clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4801bad)
#<!-- -->38 0x0000000004802c2e clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;, bool) const (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x4802c2e)
#<!-- -->39 0x000000000480a765 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&amp;, llvm::SmallVectorImpl&lt;std::pair&lt;int, clang::driver::Command const*&gt;&gt;&amp;) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0x480a765)
#<!-- -->40 0x0000000000cfb213 clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0xcfb213)
#<!-- -->41 0x0000000000bc3694 main (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0xbc3694)
#<!-- -->42 0x000071efe5029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->43 0x000071efe5029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->44 0x0000000000cf5945 _start (/opt/compiler-explorer/clang-assertions-20.1.0/bin/clang+++0xcf5945)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

[steakhal]

I guess, we should check the signature instead of assume its satisfied.

[necto]

Thank you, @vbvictor for fixing the crash!