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[Brian Murray <brian@xxxxxxxxxx>]

** Package changed: ubuntu => thunderbird (Ubuntu)

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https://bugs.launchpad.net/bugs/1424967

Title:
  Thunderbird Intermittently Uses ~130% CPU and Stops Responding

Status in thunderbird package in Ubuntu:
  New

Bug description:
  Ubuntu 14.10  (64 Bit)

  :~$ apt-cache policy thunderbird-gnome-support
  thunderbird-gnome-support:
    Installed: 1:31.4.0+build1-0ubuntu0.14.10.1
    Candidate: 1:31.4.0+build1-0ubuntu0.14.10.1
    Version table:
   *** 1:31.4.0+build1-0ubuntu0.14.10.1 0
          500 http://mirror.internode.on.net/pub/ubuntu/ubuntu/ utopic-updates/main amd64 Packages
          500 http://mirror.internode.on.net/pub/ubuntu/ubuntu/ utopic-security/main amd64 Packages
          100 /var/lib/dpkg/status
       1:31.2.0+build2-0ubuntu0.14.10.1 0
          500 http://mirror.internode.on.net/pub/ubuntu/ubuntu/ utopic/main amd64 Packages
  CPU description:  Intel(R) Core(TM) i7-4750HQ CPU @ 2.00GHz

  Thunderbird email client intermittently freezes and shows approx 130%
  CPU usage (viewed using top).  Thunderbird's memort usage seems to sit
  on around 2% (8 GByte installed).  When the thunderbird error occurs,
  the mouse moves but the system does not respond to mouse clicks.  I
  can [Alt] [Tab] to other applications (e.g. top in a shell window)
  successfully.  The mouse buttons work once I have [Alt] [Tab] away
  from Thunderbird.  The freeze sometimes lasts for only 30 seconds.
  Other times, I end up re-booting after ~5 minutes to resolve the
  lockup.  Thunderbird has two email accounts registered - 1 x POP
  account, and 1 x Gmail IMAP account.  My .thunderbird folder is 1.7
  GByte in size.

  I have been using Thunderbird on 14.10 for 4 months, and for about 10
  years on previous versions of Ubuntu, and have previously experienced
  no problems with Thunderbird.

  The problem being experienced could potentially be related to the
  installation of recent updates to Thunderbird as the errors started in
  the last week of January 2015, shortly after some thunderbird updates
  were installed.  Refer to following extract from /var/log/apt/history
  showing Thunderbird updates installed on January 22, 2015:

  Start-Date: 2015-01-22  17:09:58
  Commandline: apt-get upgrade
  Upgrade: python3-problem-report:amd64 (2.14.7-0ubuntu8, 2.14.7-0ubuntu8.1), libevent-2.0-5:amd64 (2.0.21-stable-1ubuntu1, 2.0.21-stable-1ubuntu1.14.10.1), thunderbird-locale-en-us:amd64 (31.3.0+build1-0ubuntu0.14.10.1, 31.4.0+build1-0ubuntu0.14.10.1), thunderbird:amd64 (31.3.0+build1-0ubuntu0.14.10.1, 31.4.0+build1-0ubuntu0.14.10.1), landscape-client-ui-install:amd64 (14.01-0ubuntu3, 14.12-0ubuntu0.14.10), libssh-4:amd64 (0.6.3-2ubuntu1, 0.6.3-2ubuntu1.1), thunderbird-locale-en:amd64 (31.3.0+build1-0ubuntu0.14.10.1, 31.4.0+build1-0ubuntu0.14.10.1), variety:amd64 (0.5.1-0~484~ubuntu14.10.1, 0.5.2-0~489~ubuntu14.10.1), thunderbird-gnome-support:amd64 (31.3.0+build1-0ubuntu0.14.10.1, 31.4.0+build1-0ubuntu0.14.10.1), apport-gtk:amd64 (2.14.7-0ubuntu8, 2.14.7-0ubuntu8.1), apport:amd64 (2.14.7-0ubuntu8, 2.14.7-0ubuntu8.1), python3-apport:amd64 (2.14.7-0ubuntu8, 2.14.7-0ubuntu8.1)
  End-Date: 2015-01-22  17:10:31

  There are no thunderbird related errors showing up in dmesg.

  If Thunderbird is started from a command line, there seem to be  no
  useful messages/errors  appearing on the command line.

  I disabled the Addons one by one, and determined that the Addon which
  seems to be consistently causing this problem is "Messaging Menu and
  Unity Menu Integration 1.3.1".

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