dvrogozh
commented
2 months ago Driver stack versions on my side:
$ apt-cache show libigc1 | grep Version | head -1
Version: 1.0.17193.16-950~22.04
$ apt-cache show libigdfcl1 | grep Version | head -1
Version: 1.0.17193.16-950~22.04
$ apt-cache show intel-opencl-icd | grep Version | head -1
Version: 24.26.30049.10-950~22.04
$ apt-cache show level-zero | grep Version | head -1
Version: 1.16.15-881~22.04
$ apt-cache show intel-level-zero-gpu | grep Version | head -1
Version: 1.3.30049.10-950~22.04
mdtoguchi
bader
I am trying to use intel/llvm instead of dpc++ compiler to build pytorch XPU backend which has sycl kernels. There are few issues met with this effort which I have hacks/workarounds for. However, I do see segmentation faults in ocloc compiler on device linkage stage for
xe-lpgbuilding the following 2 kernels:The error being printed is:
Note that dpc++ compiler version 2024.1 (officially used for pytorch build following https://www.intel.com/content/www/us/en/developer/articles/tool/pytorch-prerequisites-for-intel-gpu/2-5.html) can build these kernels successfully. So, dpc++ 2024.1 and intel/llvm work against same ocloc version and gpu stack on my system with the latter having segfault. Based on that I think debug should be started on intel/llvm level. Note also that I worry that dpc++ 2025 will have the same issue - this compiler is not currently verified to work for pytorch xpu backend.
Call stack with the issue:
Easier reproducer
Full reproducer
Additional effort will be needed to simplify reproducer. Below are current reproduce steps which assumes building pytorch xpu backend.
python3 -m venv ~/pytorch.xpuOnce above steps to build pytorch are done, it's possible to run these 2 commands to reproduce the issue (they require some generated files from overall pytorch build and can't be run beforehand). Note that compilation step uses
-fsycl-host-compiler=g++- that's a way pytorch xpu is being built in general.Observations:
-device pvcworks fine, but-device xe-lpgfails with segfaultcc: @mdtoguchi, @paigeale