[issue33725] Python crashes on macOS after fork with no exec

[Mouse]

Mouse <uri at ll.mit.edu> added the comment:

Tried 'spawn', 'fork', 'forkserver'. 

- 'spawn' causes consistent `FileNotFoundError: [Errno 2] No such file or directory`;
- 'fork' consistently works (tested on machines with 4 and 20 cores);
- 'forkserver' causes roughly half of the processes to crash with `FileNotFoundError`, the other half succeeds (weird!).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33725>
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