[tahoe-lafs-trac-stream] [Tahoe-LAFS] #1939: memory leak (during check --repair --add-lease)

[Tahoe-LAFS]

#1939: memory leak (during check --repair --add-lease)
----------------------------+------------------------
     Reporter:  killyourtv  |      Owner:  killyourtv
         Type:  defect      |     Status:  new
     Priority:  major       |  Milestone:  undecided
    Component:  code        |    Version:  1.9.2
   Resolution:              |   Keywords:
Launchpad Bug:              |
----------------------------+------------------------

Comment (by zooko):

 In contradiction to what kpreid said in comment:2, the flog that kv
 attached (attachment:incident-2013-04-02--11-19-06Z-urhgqtq.flog.bz2) does
 have some evidence that points to a similar problem as kpreid's original
 report. It has this:
 {{{
 [CopiedFailure instance: Traceback from remote host -- Traceback (most
 recent call last):
 Failure: foolscap.ipb.DeadReferenceError: Connection was lost (to
 tubid=ngqc) (during method=RIBucketReader:read)
 ]
 }}}
 and this:
 {{{
 2013-04-01_21:20:12.017651Z [110581]: UNUSUAL {'facility':'tahoe.encoder',
 'failure':<foolscap.call.CopiedFailure
 allmydata.util.pipeline.PipelineError>, 'format':'error while sending
 %(method)s to shareholder=%(shnum)d',
 'incarnation':('\xd0N\xca\xf7\xa7l\x8f\xce', None), 'parent':110314,
 'shnum':5, ...} FAILURE:
 [CopiedFailure instance: Traceback from remote host -- Traceback (most
 recent call last):
 Failure: allmydata.util.pipeline.PipelineError: <PipelineError
 error=([Failure instance: Traceback: <class
 'foolscap.ipb.DeadReferenceError'>: Calling Stale Broker
 /usr/lib/pymodules/python2.7/allmydata/immutable/layout.py:237:_write
 /usr/lib/pymodules/python2.7/allmydata/util/pipeline.py:89:add
 /usr/lib/python2.7/dist-
 packages/twisted/internet/defer.py:134:maybeDeferred
 /usr/lib/pymodules/python2.7/foolscap/referenceable.py:415:callRemote
 --- <exception caught here> ---
 /usr/lib/python2.7/dist-
 packages/twisted/internet/defer.py:134:maybeDeferred
 /usr/lib/pymodules/python2.7/foolscap/referenceable.py:455:_callRemote
 /usr/lib/pymodules/python2.7/foolscap/broker.py:477:newRequestID
 ])>
 ]
 }}}

 This is similar to the evidence in kpreid's log, which suggests that maybe
 a foolscap rref becoming None led to the problem.

--
Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1939#comment:16>
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