STINNER Victor <vstin...@redhat.com> added the comment:

> To be clear, what is unsafe on macOS (as of 10.13, but even more so on 10.14) 
> is calling into the Objective-C runtime between fork and exec.  The problem 
> for Python is that it’s way too easy to do that implicitly, thus causing the 
> macOS to abort the subprocess in surprising ways.

Do only a few Python module use the Objective-C runtime? Or is it basically 
"everything"?

If it's just a few, would it be possible to emit a warning or even an exception 
if called in a child process after fork?

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