Michael Felt <aixto...@felt.demon.nl> added the comment: On 30/03/2021 09:40, STINNER Victor wrote: > STINNER Victor <vstin...@python.org> added the comment: > > A core dump is a very bad sign of health. > > Can you please try to bisect which test is causing the segfault using > bisect_cmd? Try the command: > > ./python -m test.bisect_cmd -o bisect --fail-env-changed test_importlib > > The command should takes 10-60 minutes, and you should see the number of > tests decreasing. I hope that at the end, the command will identify a single > method triggering the crash. > > At the end, the create "bisect" file contains the test methods causing the > bug. > > Then you can re-run tests with: > > ./python -m test --fail-env-changed test_importlib --matchfile=bisect I like this!:
Fortunately, it did not take 10 minutes: Writing 1 tests into bisect Tests (1): * test.test_importlib.test_threaded_import.ThreadedImportTests.test_multiprocessing_pool_circular_import Output written into bisect Bisection completed in 34 iterations and 0:00:28 > > >> The core dump is caused by SIGTRAP. I need help to learn how to stop the >> core dump from being cleaned up so I can load it into dbx and hopefully >> understand/learn with sub-test is actually having issues. > You can re-run the test without libregrtest by running it directly. Example: > > ./python -m test.test_importlib > test_spec.Frozen_ModuleSpecMethodsTests.test_reload -v While - to use your example - using the normal verbose test syntax I do see the test you reference: * test_reload (test.test_importlib.test_spec.Frozen_ModuleSpecMethodsTests) ... ok but, when I run your example (and many variations) I always get something such as: So, still - closer - but not quite there with: +++++ ./python -m test.test_importlib test_spec.Frozen_ModuleSpecMethodsTests.test_reload -v test_spec (unittest.loader._FailedTest) ... ERROR ====================================================================== ERROR: test_spec (unittest.loader._FailedTest) ---------------------------------------------------------------------- AttributeError: module '__main__' has no attribute 'test_spec' ---------------------------------------------------------------------- Ran 1 test in 0.000s FAILED (errors=1) +++++ > It should create a core dump in the current directory, or you run the command > in your favorite debugger. > > > My notes on debugging a Python crash: > https://pythondev.readthedocs.io/debug_tools.html#core-dump > > ---------- > nosy: +vstinner > > _______________________________________ > Python tracker <rep...@bugs.python.org> > <https://bugs.python.org/issue43665> > _______________________________________ > ---------- Added file: https://bugs.python.org/file49922/OpenPGP_0x722BFDB61F396FC2.asc _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue43665> _______________________________________
OpenPGP_0x722BFDB61F396FC2.asc
Description: application/pgp-keys
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