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

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

> Can we at least document that the default start method (fork) is now unsafe on macOS?

Thanks, I was just going to add that I would accept a doc change for 3.7.  But the wording should be a little clearer that fork has *always* been unsafe on macOS, i.e. this is not a new issue for 3.7 which is one of the reasons it should not be backported.

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<https://bugs.python.org/issue33725>
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