[issue47245] potential undefined behavior with subprocess using vfork() on Linux

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

Our current assumptions around the use of vfork() are very much glibc specific.

Another useful reference for reasoning, comments, and history is https://github.com/golang/go/blob/master/src/syscall/exec_linux.go#L146 `forkAndExecInChild1`

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue47245>
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