Bugs item #1754642, was opened at 2007-07-16 09:26
Message generated for change (Comment added) made by gbrandl
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Category: Python Library
Group: Python 2.4
>Status: Closed
>Resolution: Duplicate
Priority: 5
Private: No
Submitted By: Geoffrey Bache (gjb1002)
Assigned to: Nobody/Anonymous (nobody)
Summary: subprocess.Popen.wait fails sporadically with threads
Initial Comment:
When several threads are using the subprocess module I occasionally get stack
traces that look like
out, err = process.communicate()
File "/usr/lib/python2.4/subprocess.py", line 1083, in communicate
self.wait()
File "/usr/lib/python2.4/subprocess.py", line 1007, in wait
pid, sts = os.waitpid(self.pid, 0)
OSError: [Errno 10] No child processes
See the fixed bug at
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1183780&group_id=5470
The problem I am observing seems to match the one described there in the
"related modules" part. After discovering that bug, I downloaded the test
program attached to it and discovered that I got the errors described from time
to time. I am using Python 2.4.3 on Red Hat EL4 and Python 2.4.4 on Red Hat
EL3, and both have this error.
I reattach my tweaked version of that test program. The only basic difference
is that testing subprocess is the default option and the default number of
threads increased to 50 as this seemed to mean it occurred more often. I have
reproduced the original popen2 problem once on Python 2.4.4 but it's much more
infrequent, and not a problem in practice for me.
See the comment at the top of that script for details of expected behaviour etc.
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>Comment By: Georg Brandl (gbrandl)
Date: 2007-08-04 07:24
Message:
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Originator: NO
Duplicate of #1731717.
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Comment By: Donovan Baarda (abo)
Date: 2007-08-03 19:37
Message:
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Bugs 1754642 and 1753891 both look like duplicates of bug 1731717 to me. I
suggest marking them both as dups of 1731717 because that one has info on
the race-condition that causes this and discussions on how to fix it.
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Comment By: Geoffrey Bache (gjb1002)
Date: 2007-07-16 09:32
Message:
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Hmm, seems someone else reported this during the weekend. Looks rather
similar to bug 1753891...
I let someone else mark as duplicate if they want. Can't harm to have two
different test programs for an indeterministic problem :)
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