[Bug 850600] Re: qcommit occasionally cripples system with excessive workload

[Dylan McCall]

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https://bugs.launchpad.net/bugs/850600

Title:
  qcommit occasionally cripples system with excessive workload

Status in “bzr” package in Ubuntu:
  New

Bug description:
  When I run bzr qcommit (or click the Commit button in bzr-explorer),
  Ubuntu becomes so overworked that it takes seconds to respond to the
  caps lock key and it is completely impossible to interact with the
  GUI.

  Because the slowdown results in everything being unworkably slow, it
  has been tricky to get much information. I have seen kswapd jump to
  the 132% CPU according to top (which happened to be running in a tty I
  switched to), and I hooked up a script to trigger the problem and run
  apport-cli after a few seconds. The result of that is being attached
  here. Hopefully it's of some use. If you need more information, please
  let me know what else I could do to probe this.

  This particular apport data was gathered from the bzr process after
  running qcommit on an unchanged lp:ubiquity-slideshow-ubuntu. It took
  two tries to actually trigger the problem. On the first try, qcommit
  worked as it is supposed to. On the second try it DoSed my system
  before showing a GUI, and it never seemed to recover even after
  running killall -9 bzr. (Killing the X server was enough, though).

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: bzr 2.4.0-3ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
  Uname: Linux 3.0.0-11-generic x86_64
  ApportVersion: 1.23-0ubuntu1
  Architecture: amd64
  Date: Wed Sep 14 21:11:27 2011
  ExecutablePath: /usr/bin/bzr
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110906)
  InterpreterPath: /usr/bin/python2.7
  PackageArchitecture: all
  SourcePackage: bzr
  UpgradeStatus: No upgrade log present (probably fresh install)

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