STINNER Victor <> added the comment:

Fix in the main branch:

commit c10c2ec7a0e06975e8010c56c9c3270f8ea322ec
Author: Antoine Pitrou <>
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 


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