| Issue |
131488
|
| Summary |
clang-21 crashed with ifunc attribute at O2 and above. Assertion `!Callees.empty() && "Expecting successful collection of versions"' failed.
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
iamanonymouscs
|
clang-21 crashed with `ifunc` attribute at `O2` and above.
Compiler explorer: https://godbolt.org/z/hbh1odEE6
```
$cat mutant.c
void a() __attribute__((ifunc("resolve_do_it_right_at_runtime")));
void *resolve_do_it_right_at_runtime() {
for (;;)
a();
}
```
```
$clang-21 -O2 mutant.c
clang: /root/llvm-project/llvm/lib/Transforms/IPO/GlobalOpt.cpp:2722: bool OptimizeNonTrivialIFuncs(llvm::Module&, llvm::function_ref<llvm::TargetTransformInfo&(llvm::Function&)>): Assertion `!Callees.empty() && "Expecting successful collection of versions"' 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 -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -O2 <source>
1. <eof> parser at end of file
2. Optimizer
3. Running pass "globalopt" on module "<source>"
#0 0x0000000003e828c8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3e828c8)
#1 0x0000000003e80554 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3e80554)
#2 0x0000000003dc53e8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#3 0x000071370b642520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
#4 0x000071370b6969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
#5 0x000071370b642476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
#6 0x000071370b6287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
#7 0x000071370b62871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
#8 0x000071370b639e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
#9 0x00000000057199d2 OptimizeNonTrivialIFuncs(llvm::Module&, llvm::function_ref<llvm::TargetTransformInfo& (llvm::Function&)>) (.constprop.0) GlobalOpt.cpp:0:0
#10 0x000000000572109e optimizeGlobalsInModule(llvm::Module&, llvm::DataLayout const&, llvm::function_ref<llvm::TargetLibraryInfo& (llvm::Function&)>, llvm::function_ref<llvm::TargetTransformInfo& (llvm::Function&)>, llvm::function_ref<llvm::BlockFrequencyInfo& (llvm::Function&)>, llvm::function_ref<llvm::DominatorTree& (llvm::Function&)>, llvm::function_ref<void (llvm::Function&)>, llvm::function_ref<void (llvm::Function&)>) (.constprop.0) GlobalOpt.cpp:0:0
#11 0x0000000005721d5f llvm::GlobalOptPass::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5721d5f)
#12 0x0000000005554c6e llvm::detail::PassModel<llvm::Module, llvm::GlobalOptPass, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x5554c6e)
#13 0x0000000003821f90 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3821f90)
#14 0x0000000004134d24 (anonymous namespace)::EmitAssemblyHelper::RunOptimizationPipeline(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>&, std::unique_ptr<llvm::ToolOutputFile, std::default_delete<llvm::ToolOutputFile>>&, clang::BackendConsumer*) BackendUtil.cpp:0:0
#15 0x000000000413856b clang::emitBackendOutput(clang::CompilerInstance&, clang::CodeGenOptions&, llvm::StringRef, llvm::Module*, clang::BackendAction, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream>>, clang::BackendConsumer*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x413856b)
#16 0x000000000483dd90 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x483dd90)
#17 0x000000000649d5ec clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x649d5ec)
#18 0x000000000483e198 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x483e198)
#19 0x0000000004b0dc75 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4b0dc75)
#20 0x0000000004a8fdbe clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4a8fdbe)
#21 0x0000000004bfd99e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4bfd99e)
#22 0x0000000000d4f95f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xd4f95f)
#23 0x0000000000d4711a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#24 0x00000000048866f9 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
#25 0x0000000003dc5884 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x3dc5884)
#26 0x0000000004886d0f 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
#27 0x000000000484977d clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x484977d)
#28 0x000000000484a80e 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+0x484a80e)
#29 0x0000000004851ee5 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0x4851ee5)
#30 0x0000000000d4c758 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xd4c758)
#31 0x0000000000c13f14 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xc13f14)
#32 0x000071370b629d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#33 0x000071370b629e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#34 0x0000000000d46bc5 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+0xd46bc5)
clang: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```
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