[Openmp-dev] segmentation fault when starting offload

[Ye Luo via Openmp-dev]

@Jeff two systems are different.
@Joachim ldd shows that my program was picking up the wrong libomp which
was installed via ubuntu package manager.
I just cleaned them up and the code is working fine now.
Thank you Jeff and Joachim
Ye
===================
Ye Luo, Ph.D.
Computational Science Division & Leadership Computing Facility
Argonne National Laboratory


Joachim Protze <protze.joachim at gmail.com> 于2019年3月16日周六 下午12:29写道：

> Hi,
>
> can you post your toy code, please?
> What is linked into your binary?
> rtl.cpp:48 tries to call __kmpc_get_target_offload, which is implemented
> in libomp.so.
>
> My best guess is that your system fetches a different version of
> libomp.so, which does not implement this function. So, what is the
> result of ldd on your binary on both systems?
>
> - Joachim
>
>
> On 3/16/19 4:50 PM, Ye Luo via Openmp-dev wrote:
> > Hi,
> > I just built the llvm+clang+openmp on 2 workstations.
> > One of them works fine but the other one cannot even start a toy code.
> > Any clue what is going on?
> >
> > Program received signal SIGSEGV, Segmentation fault.
> > 0x0000000000000000 in ?? ()
> > (gdb) bt
> > #0  0x0000000000000000 in ?? ()
> > #1  0x00007ffff71cf718 in RTLsTy::LoadRTLs (this=0x7ffff73f82c8 <RTLs>)
> > at
> >
> /home/yeluo/opt/llvm-clang/sources/llvm/projects/openmp/libomptarget/src/rtl.cpp:48
> > #2  0x00007ffff71d7e31 in std::__invoke_impl<void, void (RTLsTy::*)(),
> > RTLsTy*> (__f=@0x7fffffffda70: (void (RTLsTy::*)(RTLsTy * const))
> > 0x7ffff71cf630 <RTLsTy::LoadRTLs()>,
> >      __t=@0x7fffffffda68: 0x7ffff73f82c8 <RTLs>) at
> >
> /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/bits/invoke.h:73
> > #3  0x00007ffff71d7d92 in std::__invoke<void (RTLsTy::*)(), RTLsTy*>
> > (__fn=@0x7fffffffda70: (void (RTLsTy::*)(RTLsTy * const)) 0x7ffff71cf630
> > <RTLsTy::LoadRTLs()>,
> >      __args=@0x7fffffffda68: 0x7ffff73f82c8 <RTLs>) at
> >
> /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/bits/invoke.h:95
> > #4  0x00007ffff71d7d4c in void std::call_once<void (RTLsTy::*)(),
> > RTLsTy*>(std::once_flag&, void (RTLsTy::*&&)(),
> > RTLsTy*&&)::{lambda()#1}::operator()() const (this=0x7fffffffd808)
> >      at
> /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/mutex:672
> > #5  0x00007ffff71d7d07 in void std::call_once<void (RTLsTy::*)(),
> > RTLsTy*>(std::once_flag&, void (RTLsTy::*&&)(),
> > RTLsTy*&&)::{lambda()#2}::operator()() const (this=0x7ffff7dce7b8)
> >      at
> /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/mutex:677
> > #6  0x00007ffff71d7cd9 in void std::call_once<void (RTLsTy::*)(),
> > RTLsTy*>(std::once_flag&, void (RTLsTy::*&&)(),
> > RTLsTy*&&)::{lambda()#2}::__invoke() ()
> >      at
> /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/mutex:677
> > #7  0x00007ffff6d9e827 in __pthread_once_slow
> > (once_control=0x7ffff73f82c8 <RTLs>, init_routine=0x7ffff7b08760
> > <__once_proxy>) at pthread_once.c:116
> > #8  0x00007ffff71d7cab in __gthread_once (__once=0x7ffff73f82c8 <RTLs>,
> > __func=0x7ffff7b08760 <__once_proxy>)
> >      at
> >
> /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/x86_64-linux-gnu/c++/8/bits/gthr-default.h:699
> > #9  0x00007ffff71d06c4 in std::call_once<void (RTLsTy::*)(), RTLsTy*>
> > (__once=..., __f=@0x7fffffffda70: (void (RTLsTy::*)(RTLsTy * const))
> > 0x7ffff71cf630 <RTLsTy::LoadRTLs()>,
> >      __args=@0x7fffffffda68: 0x7ffff73f82c8 <RTLs>) at
> > /usr/lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/mutex:684
> > #10 0x00007ffff71cff41 in RTLsTy::RegisterLib (this=0x7ffff73f82c8
> > <RTLs>, desc=0x4018d0 <.omp_offloading.descriptor>)
> >      at
> >
> /home/yeluo/opt/llvm-clang/sources/llvm/projects/openmp/libomptarget/src/rtl.cpp:191
> > #11 0x00007ffff71ce13f in __tgt_register_lib (desc=0x4018d0
> > <.omp_offloading.descriptor>) at
> >
> /home/yeluo/opt/llvm-clang/sources/llvm/projects/openmp/libomptarget/src/interface.cpp:74
> > #12 0x0000000000400d87 in
> > .omp_offloading.descriptor_reg.nvptx64-nvidia-cuda ()
> > #13 0x000000000040170d in __libc_csu_init ()
> > #14 0x00007ffff69bfb28 in __libc_start_main (main=0x400ec0 <main>,
> > argc=1, argv=0x7fffffffdbf8, init=0x4016c0 <__libc_csu_init>,
> > fini=<optimized out>, rtld_fini=<optimized out>,
> stack_end=0x7fffffffdbe8)
> >      at ../csu/libc-start.c:266
> > #15 0x0000000000400dfa in _start ()
> >
> > Ye
> > ===================
> > Ye Luo, Ph.D.
> > Computational Science Division & Leadership Computing Facility
> > Argonne National Laboratory
> >
> > _______________________________________________
> > Openmp-dev mailing list
> > Openmp-dev at lists.llvm.org
> > https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
> >
>
>
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