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

> This means that the child process didn't get reaped by _cleanup().

The most likely cause is that when _cleanup() calls waitpid(pid, WNOHANG), the 
child process hasn't exited yet.
Since I had already set a rather high timeout to avoid this problem and we're 
only interested in checking that the child is correctly added to the _active 
list, I've removed the part of test_zombie_fast_process_del which checked that 
the child got collected when the next Popen instance is allocated (I added this 
check in test_leak_fast_process_del_killed, which doesn't have this timeout 
problem because the process gets killed).
I'll watch the buildbots.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12650>
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