| Issue |
155412
|
| Summary |
clang++-20 crashed with vector_size attribute. Assertion `Chunk.Kind == DeclaratorChunk::MemberPointer' failed.
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
iamanonymouscs
|
clang++-20 crashed with ```vector_size``` attribute, also crashed on trunk.
Compiler explorer (assertion trunk): https://godbolt.org/z/Mnqrnj4Ts
```
$ cat mutant.cpp
template<typename T> struct a {int (T::*b) __attribute__((vector_size(4))); };
```
```
$ clang++-20 mutant.cpp
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: /usr/lib/llvm-20/bin/clang -cc1 -triple x86_64-pc-linux-gnu -emit-obj -dumpdir a- -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name mutant.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/code/reduce -fcoverage-compilation-dir=/home/code/reduce -resource-dir /usr/lib/llvm-20/lib/clang/20 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/11/../../../../include/x86_64-linux-gnu/c++/11 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/backward -internal-isystem /usr/lib/llvm-20/lib/clang/20/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/11/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdeprecated-macro -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/mutant-84f7b2.o -x c++ mutant.cpp
1. mutant.cpp:1:75: current parser token ';'
2. mutant.cpp:1:22: parsing struct/union/class body 'a'
#0 0x00007fd745441816 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-20/bin/../lib/libLLVM.so.20.1+0x101f816)
#1 0x00007fd74543f410 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-20/bin/../lib/libLLVM.so.20.1+0x101d410)
#2 0x00007fd745441ecb (/usr/lib/llvm-20/bin/../lib/libLLVM.so.20.1+0x101fecb)
#3 0x00007fd743eff520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007fd74406bdcd (/lib/x86_64-linux-gnu/libc.so.6+0x1aedcd)
#5 0x00007fd74e173d86 clang::NestedNameSpecifierLocBuilder::getWithLocInContext(clang::ASTContext&) const (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1389d86)
#6 0x00007fd74e48dde1 clang::CXXScopeSpec::getWithLocInContext(clang::ASTContext&) const (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x16a3de1)
#7 0x00007fd74ec08bbc (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1e1ebbc)
#8 0x00007fd74ebffd55 clang::Sema::GetTypeForDeclarator(clang::Declarator&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1e15d55)
#9 0x00007fd74e640861 clang::Sema::HandleField(clang::Scope*, clang::RecordDecl*, clang::SourceLocation, clang::Declarator&, clang::Expr*, clang::InClassInitStyle, clang::AccessSpecifier) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1856861)
#10 0x00007fd74e6912b6 clang::Sema::ActOnCXXMemberDeclarator(clang::Scope*, clang::AccessSpecifier, clang::Declarator&, llvm::MutableArrayRef<clang::TemplateParameterList*>, clang::Expr*, clang::VirtSpecifiers const&, clang::InClassInitStyle) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x18a72b6)
#11 0x00007fd74db96095 clang::Parser::ParseCXXClassMemberDeclaration(clang::AccessSpecifier, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdac095)
#12 0x00007fd74db97e43 clang::Parser::ParseCXXClassMemberDeclarationWithPragmas(clang::AccessSpecifier&, clang::ParsedAttributes&, clang::TypeSpecifierType, clang::Decl*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdade43)
#13 0x00007fd74db92e53 clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xda8e53)
#14 0x00007fd74db90e6d clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xda6e6d)
#15 0x00007fd74db74563 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xd8a563)
#16 0x00007fd74dc066d6 clang::Parser::ParseDeclarationAfterTemplate(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo&, clang::ParsingDeclRAIIObject&, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe1c6d6)
#17 0x00007fd74dc05cd5 clang::Parser::ParseTemplateDeclarationOrSpecialization(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe1bcd5)
#18 0x00007fd74dc05601 clang::Parser::ParseDeclarationStartingWithTemplate(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe1b601)
#19 0x00007fd74db6eeb9 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xd84eb9)
#20 0x00007fd74dc1479f clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe2a79f)
#21 0x00007fd74dc13717 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe29717)
#22 0x00007fd74dc1318f clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe2918f)
#23 0x00007fd74db5bf1a clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xd71f1a)
#24 0x00007fd74fa7a2cb clang::FrontendAction::Execute() (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x2c902cb)
#25 0x00007fd74f9eeea4 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x2c04ea4)
#26 0x00007fd74fafda0e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x2d13a0e)
#27 0x000055cf43cee0f3 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/lib/llvm-20/bin/clang+0x120f3)
#28 0x000055cf43ceaed5 (/usr/lib/llvm-20/bin/clang+0xeed5)
#29 0x000055cf43cea2de clang_main(int, char**, llvm::ToolContext const&) (/usr/lib/llvm-20/bin/clang+0xe2de)
#30 0x000055cf43cf7716 main (/usr/lib/llvm-20/bin/clang+0x1b716)
#31 0x00007fd743ee6d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#32 0x00007fd743ee6e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#33 0x000055cf43ce8d75 _start (/usr/lib/llvm-20/bin/clang+0xcd75)
clang++-20: error: unable to execute command: Segmentation fault (core dumped)
clang++-20: error: clang frontend command failed due to signal (use -v to see invocation)
Ubuntu clang version 20.1.8 (++20250708123929+0de59a293f7a-1~exp1~20250708003944.130)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-20/bin
clang++-20: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++-20: note: diagnostic msg: /tmp/mutant-2bc6a4.cpp
clang++-20: note: diagnostic msg: /tmp/mutant-2bc6a4.sh
clang++-20: note: diagnostic msg:
********************
```
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