[issue34572] C unpickling bypasses import thread safety

[Valentyn Tymofieiev]

Change by Valentyn Tymofieiev <valentyn at google.com>:


Added file: https://bugs.python.org/file48736/find_class_deadlock.py

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34572>
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