[Buildbot-commits] [Buildbot] #2554: Webstatus crash when viewing a builder

[Buildbot trac]

#2554: Webstatus crash when viewing a builder
---------------------------+-----------------------
Reporter:  ludovicchabant  |      Owner:
    Type:  defect          |     Status:  new
Priority:  blocker         |  Milestone:  undecided
 Version:  0.8.8           |   Keywords:
---------------------------+-----------------------
 I frequently get this crash when I either want to view a builder's page,
 or a specific build's page:


 {{{
 web.Server Traceback (most recent call last):
 twisted.internet.defer.FirstError: FirstError[#0, [Failure instance:
 Traceback (failure with no frames):
   <class 'twisted.internet.defer.FirstError'>:
     FirstError[#0, [Failure instance: Traceback:
       <type 'exceptions.TypeError'>: 'NoneType' object has no attribute
 '__getitem__' C:\Python27\lib\site-
 packages\twisted\internet\defer.py:575:_runCallbacks
 D:\SnowMonkey\TnT\Build\Bin\SnowMonkey\buildbot\master\buildbot\util\lru.py:217:handle_result
 C:\Python27\lib\site-packages\twisted\internet\defer.py:380:callback
 C:\Python27\lib\site-
 packages\twisted\internet\defer.py:488:_startRunCallbacks --- <exception
 caught here> ---
 C:\Python27\lib\site-packages\twisted\internet\defer.py:575:_runCallbacks
 D:\SnowMonkey\TnT\Build\Bin\SnowMonkey\buildbot\master\buildbot\sourcestamp.py:120:<lambda>
 D:\SnowMonkey\TnT\Build\Bin\SnowMonkey\buildbot\master\buildbot\changes\changes.py:55:fromChdict
 ]] ]]
 twisted.internet.defer.FirstError:
   FirstError[#0, [Failure instance: Traceback (failure with no frames):
     <class 'twisted.internet.defer.FirstError'>:
       FirstError[#0, [Failure instance: Traceback:
         <type 'exceptions.TypeError'>:
           'NoneType' object has no attribute '__getitem__'
 C:\Python27\lib\site-packages\twisted\internet\defer.py:575:_runCallbacks
 D:\SnowMonkey\TnT\Build\Bin\SnowMonkey\buildbot\master\buildbot\util\lru.py:217:handle_result
 C:\Python27\lib\site-packages\twisted\internet\defer.py:380:callback
 C:\Python27\lib\site-
 packages\twisted\internet\defer.py:488:_startRunCallbacks --- <exception
 caught here> ---
 C:\Python27\lib\site-packages\twisted\internet\defer.py:575:_runCallbacks
 D:\SnowMonkey\TnT\Build\Bin\SnowMonkey\buildbot\master\buildbot\sourcestamp.py:120:<lambda>
 D:\SnowMonkey\TnT\Build\Bin\SnowMonkey\buildbot\master\buildbot\changes\changes.py:55:fromChdict
 ]] ]]
 }}}

 It seems that "cache" in "None" in "Change.fromChdict".

 The bug appears out of nowhere, i.e. one second it works, and the next it
 will fire all the time and I need to kill all the caches, along with the
 DB, and rebuild the master. Any idea what could be causing this? I could
 just quick-patch it and return "None" if "cache is None", but I'm not sure
 if that would be a proper fix or just delaying the problem.

-- 
Ticket URL: <http://trac.buildbot.net/ticket/2554>
Buildbot <http://buildbot.net/>
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