[Buildbot-commits] [Buildbot] #1001: start_instance on a latent BuildSlave called before stop_instance finished

[Buildbot]

#1001: start_instance on a latent BuildSlave called before stop_instance finished
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Reporter:  moschny  |       Owner:           
    Type:  defect   |      Status:  new      
Priority:  major    |   Milestone:  undecided
 Version:  master   |    Keywords:           
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 We are using a descendant of an `AbstractLatentBuildSlave`, which is
 basically modeled after `LibVirtSlave`.

 The idea is to have it started if needed, execute exactly one build, then
 insubstantiate again.

 Therefore, `max_builds` is set to 1, and the slave calls
 `self.insubstantiate()` in its `buildFinished` method.

 However, there is a race (imho a bug): When multiple builds are to be
 performed, the slave's `start_instance` is sometimes called before
 `stop_instance` is finished (i.e. before its last deferred has fired).

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Ticket URL: <http://buildbot.net/trac/ticket/1001>
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