[Llvm-bgq-discuss] trouble with clang on BGQ IO nodes

[Hal Finkel]

----- Original Message -----
> From: "John A. Biddiscombe" <biddisco at cscs.ch>
> To: llvm-bgq-discuss at lists.alcf.anl.gov
> Sent: Tuesday, March 25, 2014 8:13:02 AM
> Subject: [Llvm-bgq-discuss] trouble with clang on BGQ IO nodes
> 
> 
> 
> 
> 
> Greetings
> 
> 
> 
> I discovered today that the clang I was using was not the 20140309
> release I thought I was using, but in fact the slightly older
> 20140207 because I had not updated the symlink ‘current’ to point to
> the newer version.
> 
> 
> 
> I fixed that and then discovered that the 20140309 bgclang segfaults
> if you run it on an IO node . It works fine if you compile on the
> login node.
> 
> 
> 
> Is this expected? (previously I was able to compiled either on login
> or IO nodes without issue)

No, but then again, I've not specifically tested it. Can you run the command (the long one with clang -cc1 below) under a debugger and, when it crashes, go up to the frame that actually generated the exception, and type 'disassemble' (there will be an arrow pointing to the guilty instruction) and also 'info registers' and send the relevant output.

Thanks again,
Hal

> 
> 
> 
> JB
> 
> 
> 
> clang -O2 -fopenmp
> -L/gpfs/bbp.cscs.ch/home/biddisco/bgas/apps/clang/bgclang/omp/lib/
> stream.c -o stream_c.exe
> 
> 0 libLLVM-3.5.0svn.so 0x00000fff998b61e8
> llvm::sys::PrintStackTrace(_IO_FILE*) + 4281858696
> 
> 1 libLLVM-3.5.0svn.so 0x00000fff998b6484
> 
> 2 libLLVM-3.5.0svn.so 0x00000fff998b6900
> 
> 3 0x00000fff9a5e0418 __kernel_sigtramp_rt64 + 0
> 
> 4 clang 0x0000000010214af0
> _ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6assignIPKcEENS_9enable_ifIXsr21__is_forward_iteratorIT_EE5valueERS5_E4typeESA_SA_
> + 4271468400
> 
> 5 libLLVM-3.5.0svn.so 0x00000fff998c61dc
> llvm::Timer::init(llvm::StringRef) + 4281920764
> 
> 6 clang 0x0000000010402a18
> clang::CodeGenAction::CreateASTConsumer(clang::CompilerInstance&,
> llvm::StringRef) + 4273435544
> 
> 7 clang 0x00000000101dabf0
> clang::FrontendAction::CreateWrappedASTConsumer(clang::CompilerInstance&,
> llvm::StringRef) + 4271239776
> 
> 8 clang 0x00000000101dc4e4
> clang::FrontendAction::BeginSourceFile(clang::CompilerInstance&,
> clang::FrontendInputFile const&) + 4271246140
> 
> 9 clang 0x00000000101a8750
> clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) +
> 4271036552
> 
> 10 clang 0x0000000010185490
> clang::ExecuteCompilerInvocation(clang::CompilerInstance*) +
> 4270899376
> 
> 11 clang 0x0000000010179f74 cc1_main(char const**, char const**, char
> const*, void*) + 4270853924
> 
> 12 clang 0x00000000101829ec main + 4270888772
> 
> 13 libc.so.6 0x00000fff97b3bcf8
> 
> 14 libc.so.6 0x00000fff97b3bef0 __libc_start_main + 4293374496
> 
> Stack dump:
> 
> 0. Program arguments:
> /gpfs/bbp.cscs.ch/home/biddisco/bgas/apps/clang/bgclang/r203443-20140309/bin/clang
> -cc1 -fopenmp -triple powerpc64-unknown-linux-gnu -S -disable-free
> -main-file-name stream.c -mrelocation-model static -mdisable-fp-elim
> -fmath-errno -no-integrated-as -mconstructor-aliases -target-cpu
> ppc64 -target-linker-version 2.20.51.0.2 -resource-dir
> /gpfs/bbp.cscs.ch/home/biddisco/bgas/apps/clang/bgclang/r203443-20140309/bin/../lib/clang/3.5.0
> -internal-isystem /usr/local/include -internal-isystem
> /gpfs/bbp.cscs.ch/home/biddisco/bgas/apps/clang/bgclang/r203443-20140309/bin/../lib/clang/3.5.0/include
> -internal-externc-isystem /include -internal-externc-isystem
> /usr/include -O2 -fno-dwarf-directory-asm -fdebug-compilation-dir
> /gpfs/bbp.cscs.ch/home/biddisco/bgas/clang/build/stream
> -ferror-limit 19 -fmessage-length 161 -mstackrealign
> -fno-signed-char -fobjc-runtime=gcc -fdiagnostics-show-option
> -fcolor-diagnostics -vectorize-loops -vectorize-slp -o
> /tmp/stream-fbdca0.s -x c stream.c
> 
> clang: error: unable to execute command: Floating point exception
> (core dumped)
> 
> clang: error: clang frontend command failed due to signal (use -v to
> see invocation)
> 
> clang version 3.5.0 (trunk)
> 
> Target: powerpc64-unknown-linux-gnu
> 
> Thread model: posix
> 
> clang: note: diagnostic msg: PLEASE submit a bug report to
> http://llvm.org/bugs/ and include the crash backtrace, preprocessed
> source, and associated run script.
> 
> clang: note: diagnostic msg:
> 
> ********************
> 
> 
> 
> PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
> 
> Preprocessed source(s) and associated run script(s) are located at:
> 
> clang: note: diagnostic msg: /tmp/stream-d2f913.c
> 
> clang: note: diagnostic msg: /tmp/stream-d2f913.sh
> 
> clang: note: diagnostic msg:
> 
> 
> 
> ********************
> 
> make: *** [stream_c.exe] Error 254
> 
> 
> 
> --
> 
> John Biddiscombe, email:biddisco @.at.@ cscs.ch
> 
> http://www.cscs.ch/
> 
> CSCS, Swiss National Supercomputing Centre | Tel: +41 (91) 610.82.07
> 
> Via Trevano 131, 6900 Lugano, Switzerland | Fax: +41 (91) 610.82.82
> 
> 
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> 

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory