[libcxx-dev] [Release-testers] [10.0.0 Release] Release Candidate 1 is here

[Dimitry Andric via libcxx-dev]

On 3 Feb 2020, at 10:57, Hans Wennborg <hans at chromium.org> wrote:
> 
> On Fri, Jan 31, 2020 at 9:37 PM Dimitry Andric <dimitry at andric.com> wrote:
...
>> Unfortunately the test-suite did not build at all, as all the Bitcode
>> compilations failed with segfaults, similar to the following run under
>> gdb:
>> 
>> Starting program: /home/dim/llvm/10.0.0/rc1/Phase3/Release/llvmCore-10.0.0-rc1.install/usr/local/bin/clang++ -DNDEBUG -O3 -DNDEBUG -w -Werror=date-time -std=c++11 -MD -MT Bitcode/Benchmarks/Halide/local_laplacian/CMakeFiles/halide_local_laplacian.dir/__/common/x86_halide_runtime.bc.o -MF Bitcode/Benchmarks/Halide/local_laplacian/CMakeFiles/halide_local_laplacian.dir/__/common/x86_halide_runtime.bc.o.d -o Bitcode/Benchmarks/Halide/local_laplacian/CMakeFiles/halide_local_laplacian.dir/__/common/x86_halide_runtime.bc.o -c /home/dim/llvm/10.0.0/rc1/llvm-test-suite/Bitcode/Benchmarks/Halide/common/x86_halide_runtime.bc
>> 
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x000000010000000f in ?? ()
>> (gdb) bt
>> #0  0x000000010000000f in ?? ()
>> #1  0x00000000028ca9c0 in llvm::AAResultsWrapperPass::runOnFunction(llvm::Function&) ()
>> #2  0x0000000002e8edc0 in llvm::FPPassManager::runOnFunction(llvm::Function&) ()
>> #3  0x0000000002e8f1d3 in llvm::FPPassManager::runOnModule(llvm::Module&) ()
>> #4  0x0000000002e8f6a9 in llvm::legacy::PassManagerImpl::run(llvm::Module&) ()
>> #5  0x00000000035de7dc in clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::HeaderSearchOptions const&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout const&, llvm::Module*, clang::BackendAction, std::__1::unique_ptr<llvm::raw_pwrite_stream, std::__1::default_delete<llvm::raw_pwrite_stream> >) ()
>> #6  0x0000000003c17e67 in clang::CodeGenAction::ExecuteAction() ()
>> #7  0x0000000003b7abca in clang::FrontendAction::Execute() ()
>> #8  0x0000000003aea761 in clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) ()
>> #9  0x0000000003c12905 in clang::ExecuteCompilerInvocation(clang::CompilerInstance*) ()
>> #10 0x0000000001cbaf0e in cc1_main(llvm::ArrayRef<char const*>, char const*, void*) ()
>> #11 0x0000000001cb8f65 in ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) ()
>> #12 0x00000000039eb297 in void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const::$_1>(long) ()
>> #13 0x00000000033e406a in llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) ()
>> #14 0x00000000039ea7f0 in clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, bool*) const ()
>> #15 0x00000000039bfc5c in clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const ()
>> #16 0x00000000039c01ac in clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) const ()
>> #17 0x00000000039d336c in clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::__1::pair<int, clang::driver::Command const*> >&) ()
>> #18 0x0000000001cb884f in main ()
>> 
>> Looks like the bitcode compilation path is totally busted?  Anybody know
>> an open bug for this?
> 
> I haven't seen one, but I'm behind on email. Can you please file one
> to make sure this gets tracked?

Filed <https://bugs.llvm.org/show_bug.cgi?id=44763>.  I didn't have a
debug build of clang, so not a really informative backtrace yet.

I suppose the pre-supplied .bc files don't really get processed well by
recent versions of clang.  I hope that others can reproduce this.

-Dimitry

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