Author mcdonc
Recipients mcdonc
Date 2012-09-07.18:56:38
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Message-id <1347044200.13.0.235512745295.issue15881@psf.upfronthosting.co.za>
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The symptom is an exact duplicate of the symptom reported in the following (closed) issue:

http://bugs.python.org/issue9775

The issue is also related to the following other issues:

http://bugs.python.org/issue4106
http://bugs.python.org/issue9205
http://bugs.python.org/issue9207

To reproduce the symptom driving the patches that will be attached to this issue:

  git clone git://github.com/pypa/pip.git
  cd pip
  /any/python setup.py dev
  /any/python setup.py test

You can either wait for the entire test suite to finish or you can press ctrl-C at any time (the tests take a long time).  In either case, a traceback like the following will be printed to the console.

  Error in atexit._run_exitfuncs:
  Traceback (most recent call last):
    File "/home/chrism/opt/Python-2.7.3/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
    File "/home/chrism/opt/Python-2.7.3/lib/python2.7/multiprocessing/util.py", line 284, in _exit_function
      info('process shutting down')
  TypeError: 'NoneType' object is not callable
  Error in sys.exitfunc:
  Traceback (most recent call last):
    File "/home/chrism/opt/Python-2.7.3/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
      func(*targs, **kargs)
    File "/home/chrism/opt/Python-2.7.3/lib/python2.7/multiprocessing/util.py", line 284, in _exit_function
      info('process shutting down')
  TypeError: 'NoneType' object is not callable

From what I understand in other issues, multiprocessing.util._exit_function shouldn't actually be called *after*  the containing module's globals are destroyed (it should be called before), but this does indeed happen.

Patches will be attached that anticipate the symptom and prevent a shutdown error.  One will be attached for Python 2.7 branch, the other for the Python tip.   Each causes functions that are called at shutdown time to keep a reference around to other functions and globals used within the function, and each does some checks for the insane state and prevents an error from happening in this insane state.
History
Date User Action Args
2012-09-07 18:56:40mcdoncsetrecipients: + mcdonc
2012-09-07 18:56:40mcdoncsetmessageid: <1347044200.13.0.235512745295.issue15881@psf.upfronthosting.co.za>
2012-09-07 18:56:39mcdonclinkissue15881 messages
2012-09-07 18:56:38mcdonccreate