Segmentation fault under Python 3.9.12

Crash report

The following code snippet crashes with core dumped:

import unittest
from test import support
import sys

class Tests(unittest.TestCase):
    def test_bug(self):
        modules = set()
        for name, module in sys.modules.items():
            modules.add(module)
        new_tuples = tuple(modules)
        new_set = set(new_tuples)
        print('')
        print('sys.modules:')
        print('')
        import pprint
        pprint.pprint(modules)
        print('')
        print('len(sys.modules):', len(modules))


def test_main():
    support.run_unittest(Tests)

if __name__ == '__main__':
    test_main()

Error messages

(<object object at 0x7f0fe7b6d6a0>, <NULL>, <NULL>, <NULL>, <NULL>, <NULL>, <NULL>, <NULL>, <NULL>, <NULL>)
Segmentation fault (core dumped)

Your environment

CPython versions tested on: Python 3.9.12
Operating system and architecture: Linux hx-rs4810gs 5.15.0-57-generic 63~20.04.1-Ubuntu SMP Wed Nov 30 13:40:16 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

I can't reproduce this on Linux 6.0.12-76060006-generic #202212290932~1674139725~22.04~ca93ccf SMP PREEMPT_DYNAMIC Thu J x86_64 with Python 3.9.14. Can you reproduce with any other version?

I've just tried Python 3.8.16. It has the same error message.

Please reduce the code to the minimum needed to get a crash and then indicate which line it crashes on.

It seems that "from test import support" produces the crash.

Is that your own test.support module, or the private helper from the standard library test suite?

I cannot reproduce this crash on macos with python 3.9.15, 3.10.2, and 3.12-dev :(

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Segmentation fault under Python 3.9.12 #102329

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Segmentation fault under Python 3.9.12 #102329

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zware commented on Feb 28, 2023

YaoJiayi commented on Feb 28, 2023

terryjreedy commented on Feb 28, 2023

YaoJiayi commented on Feb 28, 2023

zware commented on Feb 28, 2023

sobolevn commented on Feb 28, 2023

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