[Buildbot] #3018: Slaves appear to be building when doing nothing

[Buildbot trac]

#3018: Slaves appear to be building when doing nothing
----------------------+-----------------------
Reporter:  Ben        |      Owner:
    Type:  undecided  |     Status:  new
Priority:  major      |  Milestone:  undecided
 Version:  0.8.9      |   Keywords:
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 From: http://markmail.org/thread/zknduuglpmpi46pk

 I have run into the following problem recently:

 from the buildslaves view I see that some slaves are being used, thus
 marked as yellow:

 Running 1 build(s)

 When I open any of those slaves' dedicated page they are doing nothing.
 They successfully finished the previous build but dont seem to be able to
 get an other job, as I guess the master is still  seeing them as busy.

 It only seems to be happening on linux slaves.

 {{{
 014-11-10 16:25:01+0100 [-] Unhandled Error
 Traceback (most recent call last):
   File
 "/usr/local/lib/python2.7/dist-packages/buildbot/process/buildstep.py",
 line 663, in finished
     self._finishFinished(results)
   File
 "/usr/local/lib/python2.7/dist-packages/buildbot/process/buildstep.py",
 line 676, in _finishFinished
     self.deferred.callback(results)
   File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line
 362, in callback
     self._startRunCallbacks(result)
   File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line
 458, in _startRunCallbacks
     self._runCallbacks()
 --- <exception caught here> ---
   File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line
 545, in _runCallbacks
     current.result = callback(current.result, *args, **kw)
   File "/usr/local/lib/python2.7/dist-packages/buildbot/process/build.py",
 line 416, in _stepDone
     return self.startNextStep()
   File "/usr/local/lib/python2.7/dist-packages/buildbot/process/build.py",
 line 403, in startNextStep
     return self.allStepsDone()
   File "/usr/local/lib/python2.7/dist-packages/buildbot/process/build.py",
 line 506, in allStepsDone
     return self.buildFinished(text, self.result)
   File "/usr/local/lib/python2.7/dist-packages/buildbot/process/build.py",
 line 537, in buildFinished
     self.builder.setExpectations(self.progress)
   File
 "/usr/local/lib/python2.7/dist-packages/buildbot/process/builder.py", line
 450, in setExpectations
     self.expectations.update(progress)
   File
 "/usr/local/lib/python2.7/dist-packages/buildbot/status/progress.py", line
 295, in update
     old = self.times[name]
 exceptions.KeyError: 'shell_20'
 }}}

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Ticket URL: <http://trac.buildbot.net/ticket/3018>
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