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Description
Description
I encountered a crash in Clang-21 when compiling the following code with compilation options:
int a;Options:
-Xclang -fsanitize-system-ignorelist=./xxxxxx -fbounds-check -fno-sanitize-link-runtime -fsigned-char Clang Version
$ clang -v
Ubuntu clang version 21.0.0 (++20250501082025+9b1051281e43-1~exp1~20250501082214.882)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-21/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/13
Candidate multilib: .;@m64
Selected multilib: .;@m64Command
The compilation command used was:
clang bug.c -Xclang -fsanitize-system-ignorelist=./optfuzz -fbounds-check -fno-sanitize-link-runtime -fsigned-char -c -o bug.oError Message
clang: warning: argument unused during compilation: '-fbounds-check' [-Wunused-command-line-argument]
fatal error: error in backend: can't open file './optfuzz': No such file or directory
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 -Xclang -fsanitize-system-ignorelist=./optfuzz -fbounds-check -fno-sanitize-link-runtime -fsigned-char <source>
#0 0x0000000003f7af98 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f7af98)
#1 0x0000000003f783c4 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f783c4)
#2 0x0000000003ebd246 llvm::CrashRecoveryContext::HandleExit(int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3ebd246)
#3 0x0000000003f6f8de llvm::sys::Process::Exit(int, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3f6f8de)
#4 0x0000000000d8e460 LLVMErrorHandler(void*, char const*, bool) cc1_main.cpp:0:0
#5 0x0000000003ec8033 llvm::report_fatal_error(llvm::Twine const&, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3ec8033)
#6 0x0000000003ec816c (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3ec816c)
#7 0x0000000007e99568 clang::SanitizerSpecialCaseList::createOrDie(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>> const&, llvm::vfs::FileSystem&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7e99568)
#8 0x0000000007e97fb9 clang::NoSanitizeList::NoSanitizeList(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>>> const&, clang::SourceManager&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x7e97fb9)
#9 0x00000000074c74eb clang::ASTContext::ASTContext(clang::LangOptions&, clang::SourceManager&, clang::IdentifierTable&, clang::SelectorTable&, clang::Builtin::Context&, clang::TranslationUnitKind) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x74c74eb)
#10 0x0000000004b94382 clang::CompilerInstance::createASTContext() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4b94382)
#11 0x0000000004c2c3cd clang::FrontendAction::BeginSourceFile(clang::CompilerInstance&, clang::FrontendInputFile const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4c2c3cd)
#12 0x0000000004ba490a clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4ba490a)
#13 0x0000000004d191f1 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4d191f1)
#14 0x0000000000d90b9f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xd90b9f)
#15 0x0000000000d8777a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#16 0x00000000049955b9 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
#17 0x0000000003ebd184 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3ebd184)
#18 0x0000000004995bcf 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
#19 0x0000000004957b9d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4957b9d)
#20 0x0000000004958c2e 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+0x4958c2e)
#21 0x00000000049617c5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x49617c5)
#22 0x0000000000d8d04f clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xd8d04f)
#23 0x0000000000c42504 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc42504)
#24 0x0000711292829d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#25 0x0000711292829e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#26 0x0000000000d87225 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xd87225)
clang: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Compiler returned: 70The issue can also be reproduced on Compiler Explorer:https://godbolt.org/z/oWPP496x5
Please let me know if you need any more details.