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UnboundLocalError in mq/ on master shutdown #3478

MikaYuoadas opened this Issue Jul 27, 2017 · 0 comments


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MikaYuoadas commented Jul 27, 2017


We're using buildbot in multi-master mode and got this stacktrace on one of the master when shutting it down:

2017-07-17 12:33:29+0000 [-] Waiting for 1 build(s) to finish
2017-07-17 12:33:29+0000 [-] Builder <Builder 'u'sql-monitor-bitbucket_scality_ring-monitor_ring_frequent-prod-frontend-0'' at 140555339856784> has 1 builds running
2017-07-17 12:33:29+0000 [-] Not shutting down, there are 1 builds running
2017-07-17 12:33:29+0000 [-] Trying shutdown sequence again
2017-07-17 12:33:30+0000 [-] <Build sql-monitor-bitbucket_scality_ring-monitor_ring_frequent-prod-frontend-0 number:32108L results:exception>: stopping build: Master Shutdown 5
2017-07-17 12:33:30+0000 [-] Unhandled error in Deferred:
2017-07-17 12:33:30+0000 [-] Unhandled Error
Traceback (most recent call last):
File "/root/bitbucket/scality/ring/venv/local/lib/python2.7/site-packages/twisted/internet/", line 1299, in _inlineCallbacks
result = g.send(result)
File "/root/bitbucket/scality/ring/venv/local/lib/python2.7/site-packages/buildbot/process/", line 105, in cleanShutdown
File "/root/bitbucket/scality/ring/venv/local/lib/python2.7/site-packages/buildbot/process/", line 687, in waitUntilFinished
lambda: self.finished)
File "/root/bitbucket/scality/ring/venv/local/lib/python2.7/site-packages/twisted/internet/", line 1445, in unwindGenerator
return _inlineCallbacks(None, gen, Deferred())
— <exception caught here> —
File "/root/bitbucket/scality/ring/venv/local/lib/python2.7/site-packages/twisted/internet/", line 1299, in _inlineCallbacks
result = g.send(result)
File "/root/bitbucket/scality/ring/venv/local/lib/python2.7/site-packages/buildbot/mq/", line 40, in waitUntilEvent
exceptions.UnboundLocalError: local variable 'res' referenced before assignment

Looking at the code at the end of waitUntilEvent():

        if not check:
            res = yield d
        yield buildCompleteConsumer.stopConsuming

If the check returned false, we try to return a value (res) that was never defined.

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