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OpenMP Segmentation Fault on XE Max GPU

lamb
Beginner
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I am trying to find the cause of a segmentation fault when running several of the SPEC Accel OpenMP benchmarks. Specifically, I have been working with the 552.ep (embarrassingly parallel) benchmark.

OS: x86_64 GNU/Linux
CPU: Intel(R) Xeon(R) CPU E5-2680 v4 @ 2.40GHz
Accelerator: Intel Iris Xe MAX
Toolkit: Intel(R) oneAPI DPC++ Compiler 2021.1.2 (2020.10.0.1214)

Compilation commands:

$ ulimit -s unlimited
$ export IGC_EnableDPEmulation=1
$ export OverrideDefaultFP64Settings=1
$ source /opt/intel/oneapi/setvars.sh

$ icx -g -Wall -O3 -I. -fiopenmp -fopenmp-targets=spir64 *.c -o ep -lm
$ gdb ./ep

Here is the result of running gdb (run). I can install the missing debuginfos and update the question if that would help in finding a solution. I can include the backtrace (gdb bt) also if that would be helpful.

(gdb) run
Starting program: /552.pep/src/ep 
Missing separate debuginfos, use: yum debuginfo-install glibc-2.28-127.el8.x86_64
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
[New Thread 0x155550008700 (LWP 811436)]
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
warning: Loadable section ".note.gnu.property" outside of ELF segments
[New Thread 0x15554d9ac700 (LWP 811437)]
 Reading from input file ep.input


 NAS Parallel Benchmarks (NPB3.3-OPENMP-C) - EP Benchmark

 Number of random numbers generated:        67108864

Thread 1 "ep" received signal SIGSEGV, Segmentation fault.
0x000015553f455bca in vISA::G4_SrcRegRegion::computeLeftBound() () from /lib64/libigc.so.1
Missing separate debuginfos, use: yum debuginfo-install ...

 

Also, I'm intending to use the level0 backend, but I see "OpenCLProgramContext" in the gdb output. Does this mean I may be using the OpenCL backend by mistake?

Thank you!

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AbhishekD_Intel
Moderator
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Hi,


Thanks for reaching out to us.

We can see that you have posted the same thread on the Intel oneAPI HPC Toolkit forum, so will no longer monitor this thread as it's a duplicate.

Please expect the reply on the other thread, link:

https://community.intel.com/t5/Intel-oneAPI-HPC-Toolkit/OpenMP-Segmentation-Fault-on-XE-Max-GPU/m-p/...



Warm REgards,

Abhishek


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