STINNER Victor <vstin...@python.org> added the comment:
Fix in the main branch:
commit c10c2ec7a0e06975e8010c56c9c3270f8ea322ec
Author: Antoine Pitrou <anto...@python.org>
Date: Fri May 14 21:37:20 2021 +0200
bpo-37788: Fix reference leak when Thread is never joined (GH-26103)
When a Thread is not joined after it has stopped, its lock may remain in
the _shutdown_locks set until interpreter shutdown. If many threads are
created this way, the _shutdown_locks set could therefore grow endlessly. To
avoid such a situation, purge expired locks each time a new one is added or
removed.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37788>
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