Segfault in llvm::DIE::getUnitDie

[Quuxplusone]

Bugzilla Link	PR51454
Status	NEW
Importance	P enhancement
Reported by	Joachim Protze (protze@itc.rwth-aachen.de)
Reported on	2021-08-12 04:13:43 -0700
Last modified on	2021-10-03 09:16:54 -0700
Version	12.0
Hardware	PC Linux
CC	aaronpuchert@alice-dsl.net, kamleshbhalui@gmail.com, llvm-bugs@lists.llvm.org
Fixed by commit(s)
Attachments	DRB112-linear-orig-no-9fab71.c (175697 bytes, text/x-csrc)
Blocks
Blocked by
See also

Created attachment 25123
Preprocessed source

The segfault occurs randomly during compilation. When executing a benchmark
with 177 kernels, the error occurs 1-2 times on my system.

release-12.0.1 source is compiled on ubuntu 18.04 using gcc-10 and these flags:

cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS='clang;clang-
tools-extra;compiler-rt;openmp'

I attach preprocessed source and script, although I cannot reproduce the
segfault with the script.

0.  Program arguments: /llvm-12.0.1/install_tree/bin/clang-12 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -mrelax-all --mrelax-relocations -disable-
free -disable-llvm-verifier -discard-value-names -main-file-name DRB112-linear-
orig-no.c -mrelocation-model static -mframe-pointer=all -fmath-errno -fno-
rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-
cpu generic -fno-split-dwarf-inlining -debug-info-kind=limited -dwarf-version=4
-debugger-tuning=gdb -fprofile-update=atomic -resource-dir /llvm-
12.0.1/install_tree/lib/clang/12.0.1 -internal-isystem /usr/local/include -
internal-isystem /llvm-12.0.1/install_tree/lib/clang/12.0.1/include -internal-
externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem
/include -internal-externc-isystem /usr/include -fdebug-compilation-dir
/home/drb/dataracebench -ferror-limit 19 -fopenmp -fopenmp-cuda-parallel-target-
regions -fsanitize=thread -fgnuc-version=4.2.1 -fcolor-diagnostics -faddrsig -o
/tmp/DRB112-linear-orig-no-9f0161.o -x c micro-benchmarks/DRB112-linear-orig-
no.c
1.  <eof> parser at end of file
2.  Code generation
 #0 0x0000558590b8cc5d llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/llvm-12.0.1/install_tree/bin/clang-12+0x3010c5d)
 #1 0x0000558590b8a964 llvm::sys::RunSignalHandlers() (/llvm-12.0.1/install_tree/bin/clang-12+0x300e964)
 #2 0x0000558590b8aadb SignalHandler(int) (/llvm-12.0.1/install_tree/bin/clang-12+0x300eadb)
 #3 0x00001481b0b18980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
 #4 0x0000558591746400 llvm::DIE::getUnitDie() const (/llvm-12.0.1/install_tree/bin/clang-12+0x3bca400)
 #5 0x000055859175168c llvm::DwarfDebug::finishEntityDefinitions() (/llvm-12.0.1/install_tree/bin/clang-12+0x3bd568c)
 #6 0x00005585917699d5 llvm::DwarfDebug::finalizeModuleInfo() (/llvm-12.0.1/install_tree/bin/clang-12+0x3bed9d5)
 #7 0x000055859176cb18 llvm::DwarfDebug::endModule() (/llvm-12.0.1/install_tree/bin/clang-12+0x3bf0b18)
 #8 0x0000558591738b89 llvm::AsmPrinter::doFinalization(llvm::Module&) (/llvm-12.0.1/install_tree/bin/clang-12+0x3bbcb89)
 #9 0x000055859036848d llvm::FPPassManager::doFinalization(llvm::Module&) (.localalias) (/llvm-12.0.1/install_tree/bin/clang-12+0x27ec48d)
#10 0x00005585903742b0 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/llvm-
12.0.1/install_tree/bin/clang-12+0x27f82b0)
#11 0x0000558590e46e9f clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
const&, llvm::Module*, clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >) (/llvm-
12.0.1/install_tree/bin/clang-12+0x32cae9f)
#12 0x0000558591ad27e4
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/llvm-
12.0.1/install_tree/bin/clang-12+0x3f567e4)
#13 0x00005585924bbde9 clang::ParseAST(clang::Sema&, bool, bool) (/llvm-
12.0.1/install_tree/bin/clang-12+0x493fde9)
#14 0x0000558591479e29 clang::FrontendAction::Execute() (/llvm-
12.0.1/install_tree/bin/clang-12+0x38fde29)
#15 0x000055859141a68b
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/llvm-
12.0.1/install_tree/bin/clang-12+0x389e68b)
#16 0x000055859152b8b8
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/llvm-
12.0.1/install_tree/bin/clang-12+0x39af8b8)
#17 0x000055858ea1eb04 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/llvm-12.0.1/install_tree/bin/clang-12+0xea2b04)
#18 0x000055858ea1c257 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
(/llvm-12.0.1/install_tree/bin/clang-12+0xea0257)
#19 0x000055858e96a24c main (/llvm-12.0.1/install_tree/bin/clang-12+0xdee24c)
#20 0x00001481afb6fbf7 __libc_start_main /build/glibc-S9d2JN/glibc-
2.27/csu/../csu/libc-start.c:344:0
#21 0x000055858ea1bbfa _start (/llvm-12.0.1/install_tree/bin/clang-12+0xe9fbfa)
clang-12: error: unable to execute command: Segmentation fault (core dumped)
clang-12: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 12.0.1
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
clang-12: note: diagnostic msg:
********************

[Quuxplusone]

Attached DRB112-linear-orig-no-9fab71.c (175697 bytes, text/x-csrc): Preprocessed source

[Quuxplusone]

Likely a duplicate of bug 50611.