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OK: further.
Two options are suggested:
There are different options to solve this issue:
* Reset _tstate_lock before using it... not sure that it's worth it, since we are going to delete the threading.Thread object with its _tstate_lock object anymore. After calling fork, the child process has exactly 1 thread: all other threads have been removed.
* Modify release_sentinel() to not use the lock: avoid PyThread_release_lock() call.
** as to option 1 - it is 'worth it' if it stops the crashes
** This is deeper than I usually go in Python code - but I'll make an effort - help is appreciated.