Guido van Rossum added the comment:

I find it pretty suspicious that when this fails it is always connecting the 
stdin pipe. That code is also suspect in the AIX failure (issue 19293), 
although for a different reason.

The only theory I have at this point is that perhaps there's a platform bug on 
OS X 10.4 and before where the pipe is considered invalid if the process 
already exits? But the subprocess shouldn't be exiting, so this theory is no 
good, unless there's also a bug that causes the fork or exec to fail. :-(

Maybe this will go away if we replace the stdin pipe with a socket pair, as we 
are proposing for issue 19293, without ever understanding why.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19294>
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