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

This bug stems from:

 https://github.com/python/cpython/blob/master/Modules/_posixsubprocess.c#L454

When stdout=fd is passed, that results in c2pwrite=fd.  The stdin/stdout/stderr 
pipe fds are closed when > 2 without checking to see if they are listed in 
pass_fds.

https://github.com/python/cpython/blob/master/Lib/subprocess.py#L1306 maps the 
following:
 stdin -> p2cread
 stdout -> c2pwrite
 stderr -> errwrite

----------
assignee:  -> gregory.p.smith
versions: +Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32270>
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