[Twisted-Python] "_wait" is blowing up?!

[Brian Granger]

By random chance I found the problem in this case.  Thanks for the
suggestions though!

Cheers,

Brian

On Thu, Aug 28, 2008 at 12:11 PM, Jean-Paul Calderone
<exarkun at divmod.com> wrote:
>
>
> On Thu, 28 Aug 2008 11:52:02 -0700, Brian Granger <ellisonbg.net at gmail.com>
> wrote:
>>>
>>> Is your code available somewhere?
>>
>> yes, the code is the IPython mainline, on launchpad:
>>
>> $ bzr branch lp:ipython
>>
>> Then, simply
>>
>> $ trial IPython
>>
>> Will show the problem.  You will also need foolcap to run the test suite.
>>
>>> Do you reliably see this error eventually if you use trial --until-
>>> failure?
>>
>> It shows up as an Error rather than a Failure.  But yes, it still shows
>> up.
>>
>>> Exactly what version of Twisted are you using?
>>
>> Latest stable.
>>
>>> What reactor do you typically run your tests under?
>>
>> Default on all platforms.
>>
>>> Not sure that I'd be able to tell you what's going on even with an answer
>>> to
>>> all of these questions, but they'd be a start :).
>>
>> Thanks, I know this type of thing is tough to debug.  Any clever
>> tricks I could use to track it down?
>
> You can try running with trial --debug (possibly also --nopm).  This will
> cause Deferred debugging to be enabled, which will cause the call site of
> each Deferred's creation to be saved.  Then you can inspect this to learn
> which Deferred is being called back multiple times.  Once you learn this,
> further debugging approaches may become apparent (like looking at all the
> call sites which can call back a Deferred created there, and figuring out
> how more than one of them can be executed).
>
> Jean-Paul
>
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