| Issue |
115606
|
| Summary |
[clang] crash at clang::AlignedAttr::clone(clang::ASTContext&) const
|
| Labels |
clang:frontend,
crash-on-invalid,
clang:frontend:fuzzer
|
| Assignees |
|
| Reporter |
yijan4845
|
**This testcase is generated by a fuzzer.**
Compiler Explorer: [https://godbolt.org/z/Pbzb7e88f](https://godbolt.org/z/Pbzb7e88f)
This invalid code will crash on clang trunk and clang assertion trunk:
```cpp
alignas(0L) class __declspec(dllexport)
int _Alignas(1L) dllexport;
A {};
```
It seems that this goes back to clang-6.
Stack dump:
```
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>:2:27: current parser token ';'
#0 0x0000000003bfb9a8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bfb9a8)
#1 0x0000000003bf96ac llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3bf96ac)
#2 0x0000000003b46ca8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000075c306e42520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x0000000007acb34a clang::AlignedAttr::clone(clang::ASTContext&) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7acb34a)
#5 0x0000000006ab4a05 mergeAlignedAttrs(clang::Sema&, clang::NamedDecl*, clang::Decl*) SemaDecl.cpp:0:0
#6 0x0000000006ace372 clang::Sema::mergeDeclAttributes(clang::NamedDecl*, clang::Decl*, clang::Sema::AvailabilityMergeKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ace372)
#7 0x0000000006ae5b14 clang::Sema::MergeVarDecl(clang::VarDecl*, clang::LookupResult&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ae5b14)
#8 0x0000000006ae6fba clang::Sema::CheckVariableDeclaration(clang::VarDecl*, clang::LookupResult&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ae6fba)
#9 0x0000000006ae95fd clang::Sema::ActOnVariableDeclarator(clang::Scope*, clang::Declarator&, clang::DeclContext*, clang::TypeSourceInfo*, clang::LookupResult&, llvm::MutableArrayRef<clang::TemplateParameterList*>, bool&, llvm::ArrayRef<clang::BindingDecl*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ae95fd)
#10 0x0000000006afe5e4 clang::Sema::HandleDeclarator(clang::Scope*, clang::Declarator&, llvm::MutableArrayRef<clang::TemplateParameterList*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6afe5e4)
#11 0x0000000006aff050 clang::Sema::ActOnDeclarator(clang::Scope*, clang::Declarator&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6aff050)
#12 0x000000000675869e clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x675869e)
#13 0x0000000006768119 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+++0x6768119)
#14 0x00000000067280ce clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x67280ce)
#15 0x000000000672888e clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672888e)
#16 0x0000000006730023 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6730023)
#17 0x0000000006730f0d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6730f0d)
#18 0x000000000672342a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x672342a)
#19 0x0000000004577d08 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4577d08)
#20 0x0000000004832e69 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4832e69)
#21 0x00000000047b20de clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x47b20de)
#22 0x0000000004918c6e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4918c6e)
#23 0x0000000000ce9f2f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce9f2f)
#24 0x0000000000ce1bea ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#25 0x00000000045baf09 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
#26 0x0000000003b47154 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3b47154)
#27 0x00000000045bb4ff 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
#28 0x00000000045817ed clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x45817ed)
#29 0x00000000045828dd 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+++0x45828dd)
#30 0x0000000004589c95 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4589c95)
#31 0x0000000000ce6dc9 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce6dc9)
#32 0x0000000000bb3954 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xbb3954)
#33 0x000075c306e29d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#34 0x000075c306e29e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#35 0x0000000000ce169e _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xce169e)
clang++: error: clang frontend command failed with exit code 139 (use -v to see invocation)
Compiler returned: 139
```
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