[Openmp-dev] segmentation fault when starting offload

[Joachim Protze via Openmp-dev]

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
> 
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