[Buildbot] #2813: Forced build never completes

[Buildbot trac]

#2813: Forced build never completes
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Reporter:  sndgeek  |      Owner:
    Type:  defect   |     Status:  new
Priority:  major    |  Milestone:  undecided
 Version:  0.8.8    |   Keywords:
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 It appears that a forced build will never complete _if_ a build is forced
 on a build slave with max_builds=1 and that slave is already running a
 build.  In the most recent case where I finally realized what might be
 happening, I was forcing a run of another build that runs on the same
 slave.

 The build master appears to actually trigger the secondary build (which it
 shouldn't do because max_builds=1) but then ignores all output from that
 slave.  The slave finishes but the master ignores its results and,
 eventually, *all* builds will stall once that slave is scheduled for
 another build.  I can't guarantee that the next scheduled build is what
 triggers this state but the master will definitely get locked up at some
 point.

 Once the system is in this state, the only way to fix it is to stop and
 restart the master.

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Ticket URL: <http://trac.buildbot.net/ticket/2813>
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