[issue39974] A race condition with GIL releasing exists in stringlib_bytes_join

[tzickel]

tzickel <icebreak at yahoo.com> added the comment:

Regarding getting the buffer and releasing the GIL, if it's wrong, why not fix other places in the code that do it, like:

https://github.com/python/cpython/blob/611836a69a7a98bb106b4d315ed76a1e17266f4f/Modules/posixmodule.c#L9619

The GIL is released, the syscall might be blocking, and iov contains pointers to buffers ?

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<https://bugs.python.org/issue39974>
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