Sébastien Sablé <sa...@users.sourceforge.net> added the comment:

Here is what faulthandler reports when I trigger it as Python is locked in 
test_socket:

"""
[108/349] test_socket
Traceback (most recent call first):
  File 
"/san_cis/home/cis/.buildbot/python-aix6/3.x.phenix.xlc/build/Lib/test/fork_wait.py",
 line 30 in f
""" (sic)

It is coherent with what truss tells:
_getpid()                                       = 1474634
_select(0, 0x00000000, 0x00000000, 0x00000000, 0x317535F0) = 0
_getpid()                                       = 1474634
_select(0, 0x00000000, 0x00000000, 0x00000000, 0x315E35F0) = 0
....

And we can find this comment in the file:
# waitpid() shouldn't hang, but some of the buildbots seem to hang
# in the forking tests.  This is an attempt to fix the problem.

----------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11223>
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