Charles-François Natali <neolo...@free.fr> added the comment:

It's not a bug.
so.readlines reads the subprocess' stdout until EOF is encountered, but in the 
meantime, if it writes a lot to stderr, the corresponding pipe fills up, and 
the subprocess blocks on the write.
You should use Popen's communicate method.

Closing as invalid.

----------
nosy: +charles-francois.natali
resolution:  -> invalid
stage: test needed -> committed/rejected
status: open -> closed

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<http://bugs.python.org/issue1495802>
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