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[clang++] Frontend assertion failure in clang::Sema::tryCaptureVariable #112632

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yype opened this issue Oct 16, 2024 · 2 comments
Open

[clang++] Frontend assertion failure in clang::Sema::tryCaptureVariable #112632

yype opened this issue Oct 16, 2024 · 2 comments
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clang:frontend:fuzzer clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash-on-invalid regression:19 Regression in 19 release

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@yype
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yype commented Oct 16, 2024

Hi there, clang++ crashes from an assertion failure on the following invalid test case:

a = ^ b ( c < ({d e ( int a,[(a]))>>

Tested version(s): only 19.1.0 and trunk (assertions build).

Example: https://godbolt.org/z/E4qvYMb5x

Stack dump 
clang++: /root/llvm-project/llvm/include/llvm/ADT/SmallVector.h:291: T& llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::operator[](llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type) [with T = clang::sema::FunctionScopeInfo*; <template-parameter-1-2> = void; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::reference = clang::sema::FunctionScopeInfo*&; llvm::SmallVectorTemplateCommon<T, <template-parameter-1-2> >::size_type = long unsigned int]: Assertion `idx < size()' failed.
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-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.	<source>:1:32: current parser token ']'
2.	<source>:1:5: block literal parsing
3.	<source>:1:16: in compound statement ('{}')
 #0 0x0000000003bb1d58 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bb1d58)
 #1 0x0000000003bafa1c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bafa1c)
 #2 0x0000000003afcd68 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007be3d8842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007be3d88969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007be3d8842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007be3d88287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007be3d882871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007be3d8839e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000006c17d5a clang::Sema::tryCaptureVariable(clang::ValueDecl*, clang::SourceLocation, clang::Sema::TryCaptureKind, clang::SourceLocation, bool, clang::QualType&, clang::QualType&, unsigned int const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c17d5a)
#10 0x0000000006c18281 clang::Sema::getCapturedDeclRefType(clang::ValueDecl*, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c18281)
#11 0x0000000006c57df2 clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&, clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::NamedDecl*, clang::TemplateArgumentListInfo const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c57df2)
#12 0x0000000006c5818f clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&, clang::LookupResult&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c5818f)
#13 0x00000000069ca169 clang::Sema::ActOnNameClassifiedAsNonType(clang::Scope*, clang::CXXScopeSpec const&, clang::NamedDecl*, clang::SourceLocation, clang::Token const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69ca169)
#14 0x0000000006702b3e clang::Parser::tryParseCXXIdExpression(clang::CXXScopeSpec&, bool, clang::Token&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6702b3e)
#15 0x00000000066e5626 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e5626)
#16 0x00000000066e7147 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e7147)
#17 0x00000000066e71d9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e71d9)
#18 0x00000000066ebbf9 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ebbf9)
#19 0x00000000066eff2d clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&, bool, bool, clang::OpaquePtr<clang::QualType>&, clang::SourceLocation&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66eff2d)
#20 0x00000000066e5ea1 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e5ea1)
#21 0x00000000066f2c23 clang::Parser::ParseArrayBoundExpression() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f2c23)
#22 0x00000000066ad42f clang::Parser::ParseBracketDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ad42f)
#23 0x00000000066bf14b clang::Parser::ParseDirectDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bf14b)
#24 0x00000000066ac396 clang::Parser::ParseDeclaratorInternal(clang::Declarator&, void (clang::Parser::*)(clang::Declarator&)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ac396)
#25 0x00000000067e0f81 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67e0f81)
#26 0x00000000066b8f60 clang::Parser::ParseParameterDeclarationClause(clang::DeclaratorContext, clang::ParsedAttributes&, llvm::SmallVectorImpl<clang::DeclaratorChunk::ParamInfo>&, clang::SourceLocation&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b8f60)
#27 0x00000000066ba248 clang::Parser::ParseFunctionDeclarator(clang::Declarator&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ba248)
#28 0x00000000066bf35f clang::Parser::ParseDirectDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bf35f)
#29 0x00000000066ac396 clang::Parser::ParseDeclaratorInternal(clang::Declarator&, void (clang::Parser::*)(clang::Declarator&)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ac396)
#30 0x00000000067e0f81 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67e0f81)
#31 0x00000000066af3e7 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66af3e7)
#32 0x00000000066b8437 clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b8437)
#33 0x00000000066b88f9 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b88f9)
#34 0x0000000006764f72 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6764f72)
#35 0x0000000006765ca0 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6765ca0)
#36 0x0000000006766b75 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6766b75)
#37 0x00000000067683da clang::Parser::ParseCompoundStatement(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67683da)
#38 0x00000000066f03ca clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&, bool, bool, clang::OpaquePtr<clang::QualType>&, clang::SourceLocation&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f03ca)
#39 0x00000000066e5ea1 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e5ea1)
#40 0x00000000066f2d1e clang::Parser::ParseConstantExpressionInExprEvalContext(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f2d1e)
#41 0x00000000067795d4 clang::Parser::ParseTemplateArgument() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67795d4)
#42 0x0000000006781527 clang::Parser::ParseTemplateArgumentList(llvm::SmallVector<clang::ParsedTemplateArgument, 16u>&, clang::OpaquePtr<clang::TemplateName>, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6781527)
#43 0x00000000067818d7 clang::Parser::ParseTemplateIdAfterTemplateName(bool, clang::SourceLocation&, llvm::SmallVector<clang::ParsedTemplateArgument, 16u>&, clang::SourceLocation&, clang::OpaquePtr<clang::TemplateName>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67818d7)
#44 0x0000000006781ab1 clang::Parser::AnnotateTemplateIdToken(clang::OpaquePtr<clang::TemplateName>, clang::TemplateNameKind, clang::CXXScopeSpec&, clang::SourceLocation, clang::UnqualifiedId&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6781ab1)
#45 0x00000000066ffb87 clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&, clang::OpaquePtr<clang::QualType>, bool, bool, bool*, bool, clang::IdentifierInfo const**, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ffb87)
#46 0x00000000066711e3 clang::Parser::TryAnnotateTypeOrScopeToken(clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66711e3)
#47 0x000000000669be63 clang::Parser::isDeclarationSpecifier(clang::ImplicitTypenameContext, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669be63)
#48 0x00000000066bb0fe clang::Parser::ParseParenDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bb0fe)
#49 0x00000000066bed88 clang::Parser::ParseDirectDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bed88)
#50 0x00000000066ac396 clang::Parser::ParseDeclaratorInternal(clang::Declarator&, void (clang::Parser::*)(clang::Declarator&)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ac396)
#51 0x00000000067e0f81 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67e0f81)
#52 0x000000000669b9bf clang::Parser::ParseDeclarator(clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669b9bf)
#53 0x00000000066e12a0 clang::Parser::ParseBlockId(clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e12a0)
#54 0x00000000066e17e3 clang::Parser::ParseBlockLiteralExpression() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e17e3)
#55 0x00000000066e5aea clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e5aea)
#56 0x00000000066e7147 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e7147)
#57 0x00000000066e71d9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e71d9)
#58 0x00000000066a0b08 clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a0b08)
#59 0x00000000066afb19 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66afb19)
#60 0x000000000666fb8e clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x666fb8e)
#61 0x000000000667034e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x667034e)
#62 0x0000000006677ae3 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6677ae3)
#63 0x00000000066789cd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66789cd)
#64 0x0000000006678e70 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6678e70)
#65 0x000000000666aeb2 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x666aeb2)
#66 0x0000000004526408 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4526408)
#67 0x00000000047e0629 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47e0629)
#68 0x000000000475f1ae clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x475f1ae)
#69 0x00000000048c5dce clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48c5dce)
#70 0x0000000000cdce6f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdce6f)
#71 0x0000000000cd4b7a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#72 0x000000000456a119 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
#73 0x0000000003afd214 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3afd214)
#74 0x000000000456a70f 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
#75 0x000000000453000d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x453000d)
#76 0x00000000045310fd clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45310fd)
#77 0x0000000004538a25 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4538a25)
#78 0x0000000000cd9d3f clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd9d3f)
#79 0x0000000000ba9264 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xba9264)
#80 0x00007be3d8829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#81 0x00007be3d8829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#82 0x0000000000cd462e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd462e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

Although the assertion failure is similar to those in #107840 and #69470, the test case provided in this issue triggers the failure only in versions 19.1.0 and the trunk. In contrast, the test cases in #107840 and #69470 both trigger the failure from version 17.0.1 to the trunk. Therefore, I believe the underlying root causes are different, which is why I am opening a new issue.

The test case was generated by a fuzzer.
@github-actions github-actions bot added the clang Clang issues not falling into any other category label Oct 16, 2024
@shafik shafik added clang:frontend:fuzzer confirmed Verified by a second party regression:19 Regression in 19 release labels Oct 16, 2024
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shafik commented Oct 16, 2024 •
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CC @zyn0217 since you fixed a bunch of these cases in #93206 maybe this arose out of that fix somehow?

@zyn0217 zyn0217 added clang:frontend Language frontend issues, e.g. anything involving "Sema" crash-on-invalid and removed clang Clang issues not falling into any other category labels Oct 17, 2024
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llvmbot commented Oct 17, 2024

@llvm/issue-subscribers-clang-frontend

Author: yype (yype)

Hi there, clang++ crashes from an assertion failure on the following invalid test case: 
a = ^ b ( c &lt; ({d e ( int a,[(a]))&gt;&gt;

Tested version(s): only 19.1.0 and trunk (assertions build).

Example: https://godbolt.org/z/E4qvYMb5x

<details>
<summary>Stack dump</summary>

clang++: /root/llvm-project/llvm/include/llvm/ADT/SmallVector.h:291: T&amp; llvm::SmallVectorTemplateCommon&lt;T, &lt;template-parameter-1-2&gt; &gt;::operator[](llvm::SmallVectorTemplateCommon&lt;T, &lt;template-parameter-1-2&gt; &gt;::size_type) [with T = clang::sema::FunctionScopeInfo*; &lt;template-parameter-1-2&gt; = void; llvm::SmallVectorTemplateCommon&lt;T, &lt;template-parameter-1-2&gt; &gt;::reference = clang::sema::FunctionScopeInfo*&amp;; llvm::SmallVectorTemplateCommon&lt;T, &lt;template-parameter-1-2&gt; &gt;::size_type = long unsigned int]: Assertion `idx &lt; size()' failed.
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-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics &lt;source&gt;
1.	&lt;source&gt;:1:32: current parser token ']'
2.	&lt;source&gt;:1:5: block literal parsing
3.	&lt;source&gt;:1:16: in compound statement ('{}')
 #<!-- -->0 0x0000000003bb1d58 llvm::sys::PrintStackTrace(llvm::raw_ostream&amp;, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bb1d58)
 #<!-- -->1 0x0000000003bafa1c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bafa1c)
 #<!-- -->2 0x0000000003afcd68 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #<!-- -->3 0x00007be3d8842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #<!-- -->4 0x00007be3d88969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #<!-- -->5 0x00007be3d8842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #<!-- -->6 0x00007be3d88287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #<!-- -->7 0x00007be3d882871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #<!-- -->8 0x00007be3d8839e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #<!-- -->9 0x0000000006c17d5a clang::Sema::tryCaptureVariable(clang::ValueDecl*, clang::SourceLocation, clang::Sema::TryCaptureKind, clang::SourceLocation, bool, clang::QualType&amp;, clang::QualType&amp;, unsigned int const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c17d5a)
#<!-- -->10 0x0000000006c18281 clang::Sema::getCapturedDeclRefType(clang::ValueDecl*, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c18281)
#<!-- -->11 0x0000000006c57df2 clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&amp;, clang::DeclarationNameInfo const&amp;, clang::NamedDecl*, clang::NamedDecl*, clang::TemplateArgumentListInfo const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c57df2)
#<!-- -->12 0x0000000006c5818f clang::Sema::BuildDeclarationNameExpr(clang::CXXScopeSpec const&amp;, clang::LookupResult&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6c5818f)
#<!-- -->13 0x00000000069ca169 clang::Sema::ActOnNameClassifiedAsNonType(clang::Scope*, clang::CXXScopeSpec const&amp;, clang::NamedDecl*, clang::SourceLocation, clang::Token const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x69ca169)
#<!-- -->14 0x0000000006702b3e clang::Parser::tryParseCXXIdExpression(clang::CXXScopeSpec&amp;, bool, clang::Token&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6702b3e)
#<!-- -->15 0x00000000066e5626 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e5626)
#<!-- -->16 0x00000000066e7147 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e7147)
#<!-- -->17 0x00000000066e71d9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e71d9)
#<!-- -->18 0x00000000066ebbf9 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ebbf9)
#<!-- -->19 0x00000000066eff2d clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&amp;, bool, bool, clang::OpaquePtr&lt;clang::QualType&gt;&amp;, clang::SourceLocation&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66eff2d)
#<!-- -->20 0x00000000066e5ea1 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e5ea1)
#<!-- -->21 0x00000000066f2c23 clang::Parser::ParseArrayBoundExpression() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f2c23)
#<!-- -->22 0x00000000066ad42f clang::Parser::ParseBracketDeclarator(clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ad42f)
#<!-- -->23 0x00000000066bf14b clang::Parser::ParseDirectDeclarator(clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bf14b)
#<!-- -->24 0x00000000066ac396 clang::Parser::ParseDeclaratorInternal(clang::Declarator&amp;, void (clang::Parser::*)(clang::Declarator&amp;)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ac396)
#<!-- -->25 0x00000000067e0f81 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67e0f81)
#<!-- -->26 0x00000000066b8f60 clang::Parser::ParseParameterDeclarationClause(clang::DeclaratorContext, clang::ParsedAttributes&amp;, llvm::SmallVectorImpl&lt;clang::DeclaratorChunk::ParamInfo&gt;&amp;, clang::SourceLocation&amp;, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b8f60)
#<!-- -->27 0x00000000066ba248 clang::Parser::ParseFunctionDeclarator(clang::Declarator&amp;, clang::ParsedAttributes&amp;, clang::BalancedDelimiterTracker&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ba248)
#<!-- -->28 0x00000000066bf35f clang::Parser::ParseDirectDeclarator(clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bf35f)
#<!-- -->29 0x00000000066ac396 clang::Parser::ParseDeclaratorInternal(clang::Declarator&amp;, void (clang::Parser::*)(clang::Declarator&amp;)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ac396)
#<!-- -->30 0x00000000067e0f81 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67e0f81)
#<!-- -->31 0x00000000066af3e7 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&amp;, clang::DeclaratorContext, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66af3e7)
#<!-- -->32 0x00000000066b8437 clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b8437)
#<!-- -->33 0x00000000066b88f9 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&amp;, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66b88f9)
#<!-- -->34 0x0000000006764f72 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6764f72)
#<!-- -->35 0x0000000006765ca0 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector&lt;clang::Stmt*, 32u&gt;&amp;, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6765ca0)
#<!-- -->36 0x0000000006766b75 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6766b75)
#<!-- -->37 0x00000000067683da clang::Parser::ParseCompoundStatement(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67683da)
#<!-- -->38 0x00000000066f03ca clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&amp;, bool, bool, clang::OpaquePtr&lt;clang::QualType&gt;&amp;, clang::SourceLocation&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f03ca)
#<!-- -->39 0x00000000066e5ea1 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e5ea1)
#<!-- -->40 0x00000000066f2d1e clang::Parser::ParseConstantExpressionInExprEvalContext(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66f2d1e)
#<!-- -->41 0x00000000067795d4 clang::Parser::ParseTemplateArgument() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67795d4)
#<!-- -->42 0x0000000006781527 clang::Parser::ParseTemplateArgumentList(llvm::SmallVector&lt;clang::ParsedTemplateArgument, 16u&gt;&amp;, clang::OpaquePtr&lt;clang::TemplateName&gt;, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6781527)
#<!-- -->43 0x00000000067818d7 clang::Parser::ParseTemplateIdAfterTemplateName(bool, clang::SourceLocation&amp;, llvm::SmallVector&lt;clang::ParsedTemplateArgument, 16u&gt;&amp;, clang::SourceLocation&amp;, clang::OpaquePtr&lt;clang::TemplateName&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67818d7)
#<!-- -->44 0x0000000006781ab1 clang::Parser::AnnotateTemplateIdToken(clang::OpaquePtr&lt;clang::TemplateName&gt;, clang::TemplateNameKind, clang::CXXScopeSpec&amp;, clang::SourceLocation, clang::UnqualifiedId&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6781ab1)
#<!-- -->45 0x00000000066ffb87 clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&amp;, clang::OpaquePtr&lt;clang::QualType&gt;, bool, bool, bool*, bool, clang::IdentifierInfo const**, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ffb87)
#<!-- -->46 0x00000000066711e3 clang::Parser::TryAnnotateTypeOrScopeToken(clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66711e3)
#<!-- -->47 0x000000000669be63 clang::Parser::isDeclarationSpecifier(clang::ImplicitTypenameContext, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669be63)
#<!-- -->48 0x00000000066bb0fe clang::Parser::ParseParenDeclarator(clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bb0fe)
#<!-- -->49 0x00000000066bed88 clang::Parser::ParseDirectDeclarator(clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66bed88)
#<!-- -->50 0x00000000066ac396 clang::Parser::ParseDeclaratorInternal(clang::Declarator&amp;, void (clang::Parser::*)(clang::Declarator&amp;)) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66ac396)
#<!-- -->51 0x00000000067e0f81 clang::Sema::runWithSufficientStackSpace(clang::SourceLocation, llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67e0f81)
#<!-- -->52 0x000000000669b9bf clang::Parser::ParseDeclarator(clang::Declarator&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x669b9bf)
#<!-- -->53 0x00000000066e12a0 clang::Parser::ParseBlockId(clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e12a0)
#<!-- -->54 0x00000000066e17e3 clang::Parser::ParseBlockLiteralExpression() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e17e3)
#<!-- -->55 0x00000000066e5aea clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&amp;, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e5aea)
#<!-- -->56 0x00000000066e7147 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e7147)
#<!-- -->57 0x00000000066e71d9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66e71d9)
#<!-- -->58 0x00000000066a0b08 clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&amp;, clang::Parser::ParsedTemplateInfo const&amp;, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66a0b08)
#<!-- -->59 0x00000000066afb19 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&amp;, clang::DeclaratorContext, clang::ParsedAttributes&amp;, clang::Parser::ParsedTemplateInfo&amp;, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66afb19)
#<!-- -->60 0x000000000666fb8e clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec&amp;, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x666fb8e)
#<!-- -->61 0x000000000667034e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x667034e)
#<!-- -->62 0x0000000006677ae3 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&amp;, clang::ParsedAttributes&amp;, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6677ae3)
#<!-- -->63 0x00000000066789cd clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x66789cd)
#<!-- -->64 0x0000000006678e70 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr&lt;clang::DeclGroupRef&gt;&amp;, clang::Sema::ModuleImportState&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6678e70)
#<!-- -->65 0x000000000666aeb2 clang::ParseAST(clang::Sema&amp;, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x666aeb2)
#<!-- -->66 0x0000000004526408 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4526408)
#<!-- -->67 0x00000000047e0629 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47e0629)
#<!-- -->68 0x000000000475f1ae clang::CompilerInstance::ExecuteAction(clang::FrontendAction&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x475f1ae)
#<!-- -->69 0x00000000048c5dce clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48c5dce)
#<!-- -->70 0x0000000000cdce6f cc1_main(llvm::ArrayRef&lt;char const*&gt;, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcdce6f)
#<!-- -->71 0x0000000000cd4b7a ExecuteCC1Tool(llvm::SmallVectorImpl&lt;char const*&gt;&amp;, llvm::ToolContext const&amp;) driver.cpp:0:0
#<!-- -->72 0x000000000456a119 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
#<!-- -->73 0x0000000003afd214 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref&lt;void ()&gt;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3afd214)
#<!-- -->74 0x000000000456a70f 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
#<!-- -->75 0x000000000453000d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&amp;, clang::driver::Command const*&amp;, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x453000d)
#<!-- -->76 0x00000000045310fd 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-trunk/bin/clang+++0x45310fd)
#<!-- -->77 0x0000000004538a25 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-trunk/bin/clang+++0x4538a25)
#<!-- -->78 0x0000000000cd9d3f clang_main(int, char**, llvm::ToolContext const&amp;) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd9d3f)
#<!-- -->79 0x0000000000ba9264 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xba9264)
#<!-- -->80 0x00007be3d8829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#<!-- -->81 0x00007be3d8829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#<!-- -->82 0x0000000000cd462e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcd462e)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

</details>

Although the assertion failure is similar to those in #107840 and #69470, the test case provided in this issue triggers the failure only in versions 19.1.0 and the trunk. In contrast, the test cases in #107840 and #69470 both trigger the failure from version 17.0.1 to the trunk. Therefore, I believe the underlying root causes are different, which is why I am opening a new issue.

The test case was generated by a fuzzer.

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clang:frontend:fuzzer clang:frontend Language frontend issues, e.g. anything involving "Sema" confirmed Verified by a second party crash-on-invalid regression:19 Regression in 19 release
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@shafik @yype @llvmbot @zyn0217