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The multiprocessing backport to 2.4/2.5 fails with a fatal error when
the test suite is run with a debug build of Python.
PYTHONPATH="Lib/" /home/heimes/dev/python/release25-maint/python -tt -c
"from multiprocessing.tests import main; main()"
Fatal Python error: Invalid thread state for this thread
Traceback (most recent call last):
 File "<string>", line 1, in <module>
 File
"/home/heimes/dev/py/python-multiprocessing/Lib/multiprocessing/tests.py",
line 1826, in main
 test_main(unittest.TextTestRunner(verbosity=2).run)
 File
"/home/heimes/dev/py/python-multiprocessing/Lib/multiprocessing/tests.py",
line 1805, in test_main
 ManagerMixin.pool = ManagerMixin.manager.Pool(4)
 File
"/home/heimes/dev/py/python-multiprocessing/Lib/multiprocessing/managers.py",
line 637, in temp
 token, exp = self._create(typeid, *args, **kwds)
 File
"/home/heimes/dev/py/python-multiprocessing/Lib/multiprocessing/managers.py",
line 535, in _create
 conn = self._Client(self._address, authkey=self._authkey)
 File
"/home/heimes/dev/py/python-multiprocessing/Lib/multiprocessing/connection.py",
line 142, in Client
 answer_challenge(c, authkey)
 File
"/home/heimes/dev/py/python-multiprocessing/Lib/multiprocessing/connection.py",
line 373, in answer_challenge
 message = connection.recv_bytes(256) # reject large message
EOFError