[2.0.0][OpenCL] issue with pocl 5.0.2 -- help :)

[picca]

Hello, I have this issue in the autopkgtest of silxs 2.0.0

https://ci.debian.net/packages/s/silx/testing/amd64/43428196/

here the buf report related to this issue

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1060318#10

I am not yet a specialiste of PyOpenCL/OpenCL/pocl debugging.

Could you help me debug this issue.

For information If I build the same code on Debian12 with pocl 3.x it works.

thanks for considering.

Fred.

PS: Next step would be to run this on this platform with real GPU hardware :)

https://ci.rocm.debian.net/packages/r/rocfft/

[kif]

Tested on PoCL 3, 4 and 5:

POCL3: OpenCL 3.0 PoCL 3.1+debian Linux, None+Asserts, RELOC, SPIR, LLVM 15.0.6, SLEEF, DISTRO, POCL_DEBUG

lintaillefer:~/workspace/silx % PYOPENCL_CTX=portable POCL_DEBUG=all POCL_WORK_GROUP_METHOD=cbs  ./run_tests.py src/silx/image/test/test_medianfilter.py -vv
INFO:silx.setup:Install requires: numpy >=1.24.2
Building silx to /users/kieffer/workspace-400/silx/build/lib.linux-x86_64-3.11
INFO:silx.setup:Install requires: numpy >=1.24.2
INFO:root:running build
INFO:root:running build_py
INFO:root:running build_ext
INFO: Disabling color, you really want to install colorlog.
INFO:pythran:Disabling color, you really want to install colorlog.
/usr/lib/python3/dist-packages/pythran/tables.py:4530: FutureWarning: In the future `np.bool` will be defined as the corresponding NumPy scalar.
  if not hasattr(numpy, method):
/usr/lib/python3/dist-packages/pythran/tables.py:4563: FutureWarning: In the future `np.bytes` will be defined as the corresponding NumPy scalar.
  obj = getattr(themodule, elem)
Patched sys.path, added: '/users/kieffer/workspace-400/silx/build/lib.linux-x86_64-3.11'
==================================================================================== test session starts =====================================================================================
platform linux -- Python 3.11.2, pytest-7.2.1, pluggy-1.0.0+repack -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: /users/kieffer/workspace-400/silx/build/lib.linux-x86_64-3.11/silx, configfile: ../../../pytest.ini
plugins: mock-3.8.2, xvfb-2.0.0
collected 2 items                                                                                                                                                                            

build/lib.linux-x86_64-3.11/silx/image/test/test_medianfilter.py::TestMedianFilterEngines::testCppMedFilt2d PASSED                                                                     [ 50%]
build/lib.linux-x86_64-3.11/silx/image/test/test_medianfilter.py::TestMedianFilterEngines::testOpenCLMedFilt2d PASSED                                                                  [100%]

===================================================================================== 2 passed in 0.52s ======================================================================================
[2024-03-11 12:22:16.793487736] POCL: in fn POclReleaseContext at line 48:
  *** INFO ***  | REFCOUNTS |  Release Context 20 (0x26b8b30), Refcount: 1

PoCL4: OpenCL 3.0 PoCL 4.0 Linux, Debug+Asserts, RELOC, SPIR, SPIR-V, LLVM 15.0.6, SLEEF, CUDA, POCL_DEBUG

[ ... ]
Patched sys.path, added: '/users/kieffer/workspace-400/silx/build/lib.linux-x86_64-3.11'
==================================================================================== test session starts =====================================================================================
platform linux -- Python 3.11.2, pytest-7.2.1, pluggy-1.0.0+repack -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: /users/kieffer/workspace-400/silx/build/lib.linux-x86_64-3.11/silx, configfile: ../../../pytest.ini
plugins: mock-3.8.2, xvfb-2.0.0
collected 2 items                                                                                                                                                                            

build/lib.linux-x86_64-3.11/silx/image/test/test_medianfilter.py::TestMedianFilterEngines::testCppMedFilt2d PASSED                                                                     [ 50%]
build/lib.linux-x86_64-3.11/silx/image/test/test_medianfilter.py::TestMedianFilterEngines::testOpenCLMedFilt2d PASSED                                                                  [100%]

===================================================================================== 2 passed in 1.65s ======================================================================================
[2024-03-11 12:23:12.822077758] POCL: in fn POclReleaseContext at line 48:
  *** INFO ***  | REFCOUNTS |  Release Context 36 (0xc5c5530), Refcount: 1

PoCL5: OpenCL 3.0 PoCL 5.0 Linux, Debug+Asserts, RELOC, SPIR, SPIR-V, LLVM 15.0.6, SLEEF, POCL_DEBUG

Patched sys.path, added: '/users/kieffer/workspace-400/silx/build/lib.linux-x86_64-3.11'
==================================================================================== test session starts =====================================================================================
platform linux -- Python 3.11.2, pytest-7.2.1, pluggy-1.0.0+repack -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: /users/kieffer/workspace-400/silx/build/lib.linux-x86_64-3.11/silx, configfile: ../../../pytest.ini
plugins: mock-3.8.2, xvfb-2.0.0
collected 2 items                                                                                                                                                                            

build/lib.linux-x86_64-3.11/silx/image/test/test_medianfilter.py::TestMedianFilterEngines::testCppMedFilt2d PASSED                                                                     [ 50%]
build/lib.linux-x86_64-3.11/silx/image/test/test_medianfilter.py::TestMedianFilterEngines::testOpenCLMedFilt2d PASSED                                                                  [100%]

===================================================================================== 2 passed in 0.52s ======================================================================================
[2024-03-11 12:28:26.268747955] POCL: in fn POclReleaseContext at line 53:
  *** INFO ***  | REFCOUNTS |  Release Context 20 (0x2c071c0), Refcount: 1

apparently it works with PoCL5 and LLVM15 (debian stable)

[kif]

I managed to get it crashing with:
OpenCL 3.0 PoCL 5.0 Linux, Debug+Asserts, RELOC, SPIR, SPIR-V, LLVM 16.0.6, SLEEF, POCL_DEBUG

[kif]

So the regression appears to be more in LLVM than in PoCL ...

[t20100]

This has been fixed in pocl: pocl/pocl#1435 (comment)

Please reopen if needed