Author anselm.kruis
Recipients anselm.kruis
Date 2019-08-07.16:22:52
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Message-id <1565194972.64.0.065323919799.issue37788@roundup.psfhosted.org>
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Starting with commit 468e5fec (bpo-36402: Fix threading._shutdown() race condition (GH-13948)) the following trivial test case leaks one reference and one memory block.

class MiscTestCase(unittest.TestCase):
    def test_without_join(self):
        # Test that a thread without join does not leak references.
        # Use a debug build and run "python -m test -R: test_threading"
        threading.Thread().start()

Attached is a patch, that adds this test case to Lib/test/test_threading.py. After you apply this patch "python -m test -R: test_threading" leaks one (additional) reference. This leak is also present in Python 3.7.4 and 3.8.

I'm not sure, if it correct not to join a thread, but it did work flawlessly and didn't leak in previous releases.
I didn't analyse the root cause yet.
History
Date User Action Args
2019-08-07 16:22:52anselm.kruissetrecipients: + anselm.kruis
2019-08-07 16:22:52anselm.kruissetmessageid: <1565194972.64.0.065323919799.issue37788@roundup.psfhosted.org>
2019-08-07 16:22:52anselm.kruislinkissue37788 messages
2019-08-07 16:22:52anselm.kruiscreate