On Thu, Aug 1, 2013 at 7:50 PM, <exar...@twistedmatrix.com> wrote: > I suggest you take a look at TimerService and figure out why pickling one > of those ever tries to pickle a LoopingCall (take a look around > `__getstate__` and `volatile`, I think that's where the problem is). I > think you'll find an existing bug that the unit test previously failed to > reveal but which your changes have revealed. >
Thanks for your help. I've found that the bug is due to a typo. The "_loopFinshed" in `TimerService.volatile` should be "_loopFinished". So when pickling a `TimerService` it will actually try to pickle "_loopFinished"(the Deferred returned by `LoopingCall.start`). When the Deferred has a reference to the `LoopingCall` instance it will then try to pickle the `LoopingCall`, thus causes the problem. I've searched and there is no ticket about this. So I will file a new ticket and fix this. -Kai
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