Ned Deily <n...@python.org> added the comment:

> Would it be safe to run the multiprocessing tests on recent macOS with the 
> OBJC_DISABLE_INITIALIZE_FORK_SAFETY environment variable set?

See Ronald's reply above in msg331101. I believe his point is that there is 
nothing you can do to make this safe. And it's not a new problem with 10.14 or 
10.13. What is new is that Apple is trying to more forcefully make you aware of 
the danger by causing the runtime to try to catch and crash these cases earlier 
rather than permit them to perhaps silently cause failures later.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33725>
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