14:50:04 E mitogen: mitogen.fork.Stream('fork.7431') crashed
Traceback (most recent call last):
  File "/home/dmw/src/mitogen/mitogen/core.py", line 1287, in _call
    func(self)
  File "/home/dmw/src/mitogen/mitogen/core.py", line 758, in on_receive
    return self.on_disconnect(broker)
  File "/home/dmw/src/mitogen/mitogen/parent.py", line 370, in on_disconnect
    super(Stream, self).on_disconnect(broker)
  File "/home/dmw/src/mitogen/mitogen/core.py", line 721, in on_disconnect
    fire(self, 'disconnect')
  File "/home/dmw/src/mitogen/mitogen/core.py", line 162, in fire
    return [func(*args, **kwargs) for func in signals.get(name, ())]
  File "/home/dmw/src/mitogen/mitogen/core.py", line 1160, in <lambda>
    listen(stream, 'disconnect', lambda: self.on_stream_disconnect(stream))
  File "/home/dmw/src/mitogen/mitogen/core.py", line 1142, in on_stream_disconnect
    for context in self._context_by_id.itervalues():
RuntimeError: dictionary changed size during iteration