That actually wasn't the kind of debugging I was hoping for; I added
these three prints
print '*** subprocess _cleanup'
print '*** _active type:', type(_active)
print '*** _active:', _active
which ideally would appear in the output somewhere. Your output is
interesting as well, as it does point to a bug in subprocess. I'm not
quite sure why __del__() would be called at a time when the Popen object
doesn't have a _child_created attribute, that could only happen if
__del__ was invoked by the _cleanup() method. If that happens, that
would mean that the object gets destroyed while it hasn't even finished
the constructor yet.
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https://bugs.launchpad.net/bugs/711225
Title:
subprocess.Popen() crashed with TypeError in _cleanup(): an integer is
required
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