Thomas Moreau <thomas.moreau.2...@gmail.com> added the comment:

For new processes created with spawn or forkserver, only the 
semaphore_tracker._fd is send and shared to the child. Thus, as the _pid 
argument is None in the new process, it launches a new tracker if it needs to 
create a new Semaphore, regardless of crashes in the previous semaphore tracker.

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<https://bugs.python.org/issue31310>
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