[3.8] bpo-37788: Fix reference leak when Thread is never joined (GH-26103) #28239
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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. (cherry picked from commit c10c2ec) Co-authored-by: @pitrou
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This isn't a security fix and as such we can't accept it. See more: https://devguide.python.org/devcycle/#security-branches |
This is a backport for #26103, automatic backport failed due to conflicts, hopefully I've done everything correctly.
Original PR description:
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.
Co-authored-by: @pitrou
https://bugs.python.org/issue37788