[llvm-dev] llvm-7.0.0rc2: Segmentation fault with a certain combination of options

Thu Aug 23 06:46:50 PDT 2018

Hi,

today I've installed llvm-7.0.0rc2. Unfortunately, I still get the error that
I've reported in Bug 38073 and for llvm-7.0.0rc1 (I'm still waiting for an
approval or disapproval from the llvm-bugs list moderator). Therefore, I tried
this list today. Unfortunately, the email had to await for the approval of the
list moderator once more, because the requested attached files for the bug
report are too big. I try again without attachments.

loki introduction 108 clang -v
clang version 7.0.0 (tags/RELEASE_700/rc2 340514)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/llvm-7.0.0/bin
Found candidate GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.8
Selected GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
Found CUDA installation: /usr/local/cuda-9.0, version 9.0
loki introduction 109

The problem occurs with a certain combination of options (-mllvm -polly-parallel
-mllvm -polly-vectorizer=stripmine). I didn't get the error with llvm-6.0.0.

loki introduction 109 \clang -m64 -std=c11 -O2 -mllvm -polly-vectorizer=stripmine mat_mult_block_ikj.c -lomp -lm

loki introduction 110 \clang -m64 -std=c11 -O2 -mllvm -polly -mllvm -polly-vectorizer=stripmine mat_mult_block_ikj.c -lomp -lm

loki introduction 111 \clang -m64 -std=c11 -O2 -mllvm -polly -mllvm -polly-parallel mat_mult_block_ikj.c -lomp -lm

loki introduction 112 \clang -m64 -std=c11 -O2 -mllvm -polly -mllvm -polly-parallel -mllvm -polly-vectorizer=stripmine mat_mult_block_ikj.c -lomp -lm
Stack dump:
0.    Program arguments: /usr/local/llvm-7.0.0/bin/clang-7 -cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -disable-llvm-verifier 
-discard-value-names -main-file-name mat_mult_block_ikj.c -mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases 
-munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -resource-dir 
/usr/local/llvm-7.0.0/lib64/clang/7.0.0 -I/usr/local/intel_xe_2019beta/compilers_and_libraries_2019.0.070/linux/ipp/include 
-I/usr/local/intel_xe_2019beta/compilers_and_libraries_2019.0.070/linux/mkl/include 
-I/usr/local/intel_xe_2019beta/compilers_and_libraries_2019.0.070/linux/pstl/include 
-I/usr/local/intel_xe_2019beta/compilers_and_libraries_2019.0.070/linux/tbb/include 
-I/usr/local/intel_xe_2019beta/compilers_and_libraries_2019.0.070/linux/tbb/include 
-I/usr/local/intel_xe_2019beta/compilers_and_libraries_2019.0.070/linux/daal/include -c-isystem /usr/local/valgrind-3.12.0/include -c-isystem 
/usr/local/llvm-7.0.0/include -c-isystem /usr/local/include -c-isystem /usr/include -c-isystem /usr/local/cuda-9.0/include -c-isystem 
/usr/local/hwloc-2.0.1/include -c-isystem /home/fd1026/Linux/x86_64/include -internal-isystem /usr/local/include -internal-isystem 
/usr/local/llvm-7.0.0/lib64/clang/7.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -std=c11 -fdebug-compilation-dir 
/home/fd1026/work/skripte/master/parallel/prog/introduction -ferror-limit 19 -fmessage-length 100 -fobjc-runtime=gcc -fdiagnostics-show-option 
-fcolor-diagnostics -vectorize-loops -vectorize-slp -mllvm -polly -mllvm -polly-parallel -mllvm -polly-vectorizer=stripmine -o /tmp/mat_mult_block_ikj-e025b7.o 
-x c mat_mult_block_ikj.c -faddrsig
1.    <eof> parser at end of file
2.    Code generation
3.    Running pass 'Function Pass Manager' on module 'mat_mult_block_ikj.c'.
4.    Running pass 'Live Variable Analysis' on function '@main_polly_subfn_polly_subfn'
#0 0x00007fceab261a8a llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/usr/local/llvm-7.0.0/lib64/libLLVMSupport.so.7+0x115a8a)
#1 0x00007fceab2600b5 llvm::sys::RunSignalHandlers() (/usr/local/llvm-7.0.0/lib64/libLLVMSupport.so.7+0x1140b5)
#2 0x00007fceab2601cc SignalHandler(int) (/usr/local/llvm-7.0.0/lib64/libLLVMSupport.so.7+0x1141cc)
#3 0x00007fceae64ac10 __restore_rt (/lib64/libpthread.so.0+0x10c10)
#4 0x00007fceaf31420e llvm::LiveVariables::HandleVirtRegUse(unsigned int, llvm::MachineBasicBlock*, llvm::MachineInstr&) 
(/usr/local/llvm-7.0.0/lib64/libLLVMCodeGen.so.7+0x1a120e)
#5 0x00007fceaf3147df llvm::LiveVariables::runOnInstr(llvm::MachineInstr&, llvm::SmallVectorImpl<unsigned int>&) 
(/usr/local/llvm-7.0.0/lib64/libLLVMCodeGen.so.7+0x1a17df)
#6 0x00007fceaf315123 llvm::LiveVariables::runOnBlock(llvm::MachineBasicBlock*, unsigned int) (/usr/local/llvm-7.0.0/lib64/libLLVMCodeGen.so.7+0x1a2123)
#7 0x00007fceaf317a40 llvm::LiveVariables::runOnMachineFunction(llvm::MachineFunction&) (/usr/local/llvm-7.0.0/lib64/libLLVMCodeGen.so.7+0x1a4a40)
#8 0x00007fceaf3756d1 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/usr/local/llvm-7.0.0/lib64/libLLVMCodeGen.so.7+0x2026d1)
#9 0x00007fceac5d7697 llvm::FPPassManager::runOnFunction(llvm::Function&) (/usr/local/llvm-7.0.0/lib64/libLLVMCore.so.7+0x180697)
#10 0x00007fceac5d7883 llvm::FPPassManager::runOnModule(llvm::Module&) (/usr/local/llvm-7.0.0/lib64/libLLVMCore.so.7+0x180883)
#11 0x00007fceac5d7f60 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/local/llvm-7.0.0/lib64/libLLVMCore.so.7+0x180f60)
#12 0x00007fceadba649a 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> >) (/usr/local/llvm-7.0.0/lib64/libclangCodeGen.so.7+0xbf49a)
#13 0x00007fceaddbd6c4 clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&) (/usr/local/llvm-7.0.0/lib64/libclangCodeGen.so.7+0x2d66c4)
#14 0x00007fcea6382679 clang::ParseAST(clang::Sema&, bool, bool) (/usr/local/llvm-7.0.0/lib64/libclangParse.so.7+0x2f679)
#15 0x00007fceaddbca81 clang::CodeGenAction::ExecuteAction() (/usr/local/llvm-7.0.0/lib64/libclangCodeGen.so.7+0x2d5a81)
#16 0x00007fcead4a4a36 clang::FrontendAction::Execute() (/usr/local/llvm-7.0.0/lib64/libclangFrontend.so.7+0xc2a36)
#17 0x00007fcead4648d6 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/local/llvm-7.0.0/lib64/libclangFrontend.so.7+0x828d6)
#18 0x00007fcead1df509 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/local/llvm-7.0.0/lib64/libclangFrontendTool.so.7+0x4509)
#19 0x00000000004124b8 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/local/llvm-7.0.0/bin/clang-7+0x4124b8)
#20 0x000000000040dfe1 main (/usr/local/llvm-7.0.0/bin/clang-7+0x40dfe1)
#21 0x00007fcea89e4725 __libc_start_main (/lib64/libc.so.6+0x20725)
#22 0x000000000040fbd9 _start /home/abuild/rpmbuild/BUILD/glibc-2.22/csu/../sysdeps/x86_64/start.S:121:0
clang-7: error: unable to execute command: Segmentation fault (core dumped)
clang-7: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 7.0.0 (tags/RELEASE_700/rc2 340514)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/llvm-7.0.0/bin
clang-7: note: diagnostic msg: PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace, preprocessed source, and associated run script.
clang-7: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-7: note: diagnostic msg: /tmp/mat_mult_block_ikj-548141.c
clang-7: note: diagnostic msg: /tmp/mat_mult_block_ikj-548141.sh
clang-7: note: diagnostic msg:

********************
loki introduction 113

Hopefully somebody can fix the problem. Do you need anything else to locate the error? Thank you very much for any help in advance.

Kind regards

Siegmar