[ python-Bugs-1199282 ] subprocess _active.remove(self) self not in list _active

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Bugs item #1199282, was opened at 2005-05-10 18:24
Message generated for change (Comment added) made by hvb_tup
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Category: Python Library
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: cheops (atila-cheops)
Assigned to: Peter Åstrand (astrand)
Summary: subprocess _active.remove(self) self not in list _active

Initial Comment:
I start a subprocess in a seperate thread (25 concurrent 
threads)
in some of the threads the following error occurs
 
Exception in thread Thread-4:
Traceback (most recent call last):
  File "C:\Python24\lib\threading.py", line 442, in 
__bootstrap
    self.run()
  File "upgrade.py", line 45, in run
    returncode = p.wait()
  File "C:\Python24\lib\subprocess.py", line 765, in wait
    _active.remove(self)
ValueError: list.remove(x): x not in list
 
this is the code that starts the subprocess and where I 
wait for the result
 
p = subprocess.Popen('command', \
                             stdin=None, 
stdout=subprocess.PIPE, \
                             stderr=subprocess.STDOUT, 
universal_newlines=True)
returncode = p.wait()
errormessage = p.stdout.readlines()

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Comment By: HVB bei TUP (hvb_tup)
Date: 2006-01-23 16:34

Message:
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user_id=1434251

BTW: In my case, I call python.exe from a Windows service.

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Comment By: HVB bei TUP (hvb_tup)
Date: 2006-01-23 16:30

Message:
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user_id=1434251

I have a similar problem.
Python 2.4.1 under MS Windows 2003,
Multi-Threaded application (about concurrent 10 threads).

In my case the same error occurs during _cleanup called 
from __init__ :

  
File "E:\lisa_ins\ewu\coop\reporting\python\tup_lisa\util\t
hreadutil.py", line 582, in callSubProcess
    creationflags = creationflags
  File "C:\Python24\lib\subprocess.py", line 506, in 
__init__
    _cleanup()
  File "C:\Python24\lib\subprocess.py", line 414, in 
_cleanup
    inst.poll()
  File "C:\Python24\lib\subprocess.py", line 755, in poll
    _active.remove(self)
ValueError: list.remove(x): x not in list

Is there a work-around?


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Comment By: cheops (atila-cheops)
Date: 2005-09-19 09:29

Message:
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user_id=1276121

I noticed this bug under windows
to reproduce the bug, I attached the script I use, but this 
needs input, I tried with a simpler example (pinging a number 
of host concurrently) but that did not cause the bug.

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Comment By: Peter Åstrand (astrand)
Date: 2005-06-23 16:03

Message:
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user_id=344921

I believe it should be sufficient to add a try...except
clause around _active.remove(). Can you upload a complete
example that triggers the bug? Have you noticed this bug on
Windows, UNIX or both platforms?


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Comment By: cheops (atila-cheops)
Date: 2005-05-12 10:17

Message:
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user_id=1276121

this might be related to bug 1183780

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https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1199282&group_id=5470