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Tested on MacOSX 10.5.4, running test_multiprocessing in a tight loop :
[~/Sources/py3k]> while true;do ./python ./Lib/test/regrtest.py 
test_multiprocessing;done
test_multiprocessing
1 test OK.
test_multiprocessing
1 test OK.
test_multiprocessing
1 test OK.
test_multiprocessing
Process Process-48:
Traceback (most recent call last):
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/managers.py", 
line 720, in _callmethod
 conn = self._tls.connection
AttributeError: 'ForkAwareLocal' object has no attribute 'connection'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/process.py", 
line 232, in _bootstrap
 self.run()
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/process.py", 
line 88, in run
 self._target(*self._args, **self._kwargs)
 File "/Users/cartman/Sources/py3k/Lib/test/test_multiprocessing.py", 
line 601, in f
 cond.acquire()
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/managers.py", 
line 949, in acquire
 return self._callmethod('acquire', (blocking,))
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/managers.py", 
line 724, in _callmethod
 self._connect()
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/managers.py", 
line 711, in _connect
 conn = self._Client(self._token.address, authkey=self._authkey)
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/connection.py", 
line 133, in Client
 c = SocketClient(address)
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/connection.py", 
line 254, in SocketClient
 s.connect(address)
socket.error: [Errno 61] Connection refused
Exception in thread Thread-58:
Traceback (most recent call last):
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/managers.py", 
line 720, in _callmethod
 conn = self._tls.connection
AttributeError: 'ForkAwareLocal' object has no attribute 'connection'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/Users/cartman/Sources/py3k/Lib/threading.py", line 492, in 
_bootstrap_inner
 self.run()
 File "/Users/cartman/Sources/py3k/Lib/threading.py", line 447, in run
 self._target(*self._args, **self._kwargs)
 File "/Users/cartman/Sources/py3k/Lib/test/test_multiprocessing.py", 
line 601, in f
 cond.acquire()
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/managers.py", 
line 949, in acquire
 return self._callmethod('acquire', (blocking,))
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/managers.py", 
line 724, in _callmethod
 self._connect()
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/managers.py", 
line 711, in _connect
 conn = self._Client(self._token.address, authkey=self._authkey)
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/connection.py", 
line 133, in Client
 c = SocketClient(address)
 File "/Users/cartman/Sources/py3k/Lib/multiprocessing/connection.py", 
line 254, in SocketClient
 s.connect(address)
socket.error: [Errno 61] Connection refused