Gregory P. Smith <g...@krypto.org> added the comment:

Immediate action item: Add a way for people to disable vfork at runtime by 
setting a flag in the subprocess module, just in case.

This can be backported to 3.10 - It'd provide an escape hatch for anyone 
without a need to rebuild Python to disable use of vfork() without resorting to 
LD_PRELOAD hacks.

This is not an urgent issue unless actual practical problems are being observed 
in the field.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue47245>
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