STINNER Victor added the comment:
Python 2.7 uses its own implementation of Thread Local Storage: see find_key()
in Python/thread.c. This implementation uses a lock and a chained list. A fork
only clones the current thread in the child process, all other threads are
"removed", so Python has to manually remove all TLS variables of the other
threads using PyThread_ReInitTLS().
I don't think that Python 3 is affected by such bug, since Python 3 uses native
TLS APIs like pthread pthread_{get,set}specific() on UNIX/BSD.
----------
nosy: +haypo
title: Python core crash during os.fork() on CentOS 6.5 (Python 2.7.13) ->
Crash in PyThread_ReInitTLS() in the child process after os.fork() on CentOS
6.5 (Python 2.7.13)
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<http://bugs.python.org/issue30967>
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