An interesting bug failure on one of the buildbots. It seems importlib has been enabled as the default import mechanism (when? where?).

test_multiprocessing
Process Process-24:
Traceback (most recent call last):
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/multiprocessing/process.py", line 233, in _bootstrap
    self.run()
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/multiprocessing/process.py", line 88, in run
    self._target(*self._args, **self._kwargs)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/test/test_multiprocessing.py", line 1210, in _putter
    manager.connect()
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/multiprocessing/managers.py", line 477, in connect
    conn = Client(self._address, authkey=self._authkey)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/multiprocessing/connection.py", line 427, in XmlClient
    import xmlrpc.client as xmlrpclib
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/_bootstrap.py", line 151, in decorated
    return fxn(self, module)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/_bootstrap.py", line 399, in load_module
    return self._load_module(module)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/_bootstrap.py", line 324, in _load_module
    code_object = self.get_code(module.__name__)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/_bootstrap.py", line 411, in get_code
    pyc_timestamp = marshal._r_long(data[4:8])
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/__init__.py", line 65, in _r_long
    x = int_bytes[0]
IndexError: index out of range
test test_multiprocessing failed -- Traceback (most recent call last):
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/test/test_multiprocessing.py", line 1223, in test_rapid_restart
    queue = manager.get_queue()
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/multiprocessing/managers.py", line 644, in temp
    token, exp = self._create(typeid, *args, **kwds)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/multiprocessing/managers.py", line 542, in _create
    conn = self._Client(self._address, authkey=self._authkey)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/multiprocessing/connection.py", line 427, in XmlClient
    import xmlrpc.client as xmlrpclib
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/_bootstrap.py", line 151, in decorated
    return fxn(self, module)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/_bootstrap.py", line 399, in load_module
    return self._load_module(module)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/_bootstrap.py", line 324, in _load_module
    code_object = self.get_code(module.__name__)
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/_bootstrap.py", line 411, in get_code
    pyc_timestamp = marshal._r_long(data[4:8])
  File "/home/buildbot/slave/py-build/3.1.norwitz-amd64/build/Lib/importlib/__init__.py", line 65, in _r_long
    x = int_bytes[0]
IndexError: index out of range