| Issue |
86906
|
| Summary |
[Clang][Crash] Clang-18 Assertion `iter->getSecond() >= 0 && "Found a negative number of references to a VarDecl"' failed.
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
wierton
|
Compiler Explorer: https://gcc.godbolt.org/z/bhnczdK3h
The reproducer:
```
void
foo (void)
{
int a[1024] = {0};
int *p = 0, *q = 0;
#pragma omp parallel for collapse(2)
for (p = &a[0]; p < &a[512]; p += 3)
for (q = p + 64; q < p + 128; q++)
;
}
```
The stack backtrace:
```
clang: /root/llvm-project/clang/lib/Sema/SemaDecl.cpp:2189: void clang::Sema::DiagnoseUnusedButSetDecl(const clang::VarDecl*, clang::Sema::DiagReceiverTy): Assertion `iter->getSecond() >= 0 && "Found a negative number of references to a VarDecl"' 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 -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -fopenmp-simd <source>
1. <eof> parser at end of file
2. <source>:3:1: parsing function body 'foo'
#0 0x0000000003920cd8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3920cd8)
#1 0x000000000391e9bc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x391e9bc)
#2 0x0000000003865258 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x00007f4897842520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x00007f48978969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x00007f4897842476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x00007f48978287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x00007f489782871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x00007f4897839e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x00000000064ed80a clang::Sema::DiagnoseUnusedButSetDecl(clang::VarDecl const*, llvm::function_ref<void (clang::SourceLocation, clang::PartialDiagnostic)>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x64ed80a)
#10 0x00000000065258a5 clang::Sema::ActOnPopScope(clang::SourceLocation, clang::Scope*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x65258a5)
#11 0x00000000061bbe25 clang::Parser::ExitScope() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61bbe25)
#12 0x00000000062aea81 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x62aea81)
#13 0x00000000061c9b41 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61c9b41)
#14 0x00000000062011bc 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+0x62011bc)
#15 0x00000000061bdade clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61bdade)
#16 0x00000000061be2d3 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61be2d3)
#17 0x00000000061c5746 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61c5746)
#18 0x00000000061c65ed clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61c65ed)
#19 0x00000000061c6ac0 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61c6ac0)
#20 0x00000000061b929c clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x61b929c)
#21 0x00000000041bd968 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41bd968)
#22 0x000000000443cfe9 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x443cfe9)
#23 0x00000000043c66de clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x43c66de)
#24 0x000000000452009e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x452009e)
#25 0x0000000000c29b5c cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc29b5c)
#26 0x0000000000c22dea ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#27 0x00000000042008e9 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
#28 0x0000000003865704 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3865704)
#29 0x0000000004200edf 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
#30 0x00000000041c7275 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41c7275)
#31 0x00000000041c7cdd 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+0x41c7cdd)
#32 0x00000000041cfa45 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x41cfa45)
#33 0x0000000000c26ff5 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc26ff5)
#34 0x0000000000b1d474 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xb1d474)
#35 0x00007f4897829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#36 0x00007f4897829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#37 0x0000000000c228de _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc228de)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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