Case 3 seen on buildbot Windows 7 3.1:

http://www.python.org/dev/buildbot/all/builders/x86%20Windows7%203.1/builds/676

test_array (test.test_multiprocessing.WithProcessesTestArray) ... Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "D:\cygwin\home\db3l\buildarea\3.1.bolen-windows7\build\lib\multiprocessing\forking.py", line 344, in main
    self = load(from_parent)
  File "D:\cygwin\home\db3l\buildarea\3.1.bolen-windows7\build\lib\pickle.py", line 1356, in load
    encoding=encoding, errors=errors).load()
  File "D:\cygwin\home\db3l\buildarea\3.1.bolen-windows7\build\lib\unittest.py", line 1363, in __getattr__
    return getattr(self.stream,attr)
(...)
  File "D:\cygwin\home\db3l\buildarea\3.1.bolen-windows7\build\lib\unittest.py", line 1363, in __getattr__
    return getattr(self.stream,attr)
RuntimeError: maximum recursion depth exceeded while calling a Python object