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[Scaler <1451613@xxxxxxxxxxxxxxxxxx>]

Sorry I couldn't provide backtrace with debug symbols…

Regarding proposed packages:
To be sure, I went back to the old versions of packages unity, unity-services and libunity-core-6.0.9 (7.2.5+14.04.20150521.1-0ubuntu1), reboot, crashes are back.

Then I installed the proposed repository, updated the three packages to
latest version: 7.2.5+14.04.20150603-0ubuntu1, reboot, no more crashes.

** Tags removed: verification-needed
** Tags added: verification-done

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https://bugs.launchpad.net/bugs/1451613

Title:
  [regression] Unity/compiz crashes when locking screen

Status in Unity:
  Invalid
Status in Unity 7.2 series:
  In Progress
Status in unity package in Ubuntu:
  Invalid
Status in unity source package in Trusty:
  Fix Committed

Bug description:
  [ Impact ]

  A crash is occurring for many users of Trusty when the screen is
  locking.

  [ Test Case ]

  Lock the screen.

  [ Regression Potential ]

  None as this is removing a commit causing this regression.

  The debdiff is found at
  https://bugs.launchpad.net/unity/+bug/1451613/+attachment/4409311/+files/unity.revert-3810.debdiff

  -----------------------------------------------------------------------------

  Original Description:

  Since a recent update (around April 29th), sometimes (approximately once a day) when I lock my computer screen (CTRL+L or using system menu) the computer freeze for a while (2 to 30 seconds) before showing the login screen.
  Then when I try to unlock the screen I need to enter my password twice (with no error message after the first try).
  Once logged in, all applications are closed. Uptime is still running (since no reboot) and services too (with no interruption).

  Looking at the apport.log file (see attached) it seems that when I try
  to lock the screen, compiz crashes.

  I've attached the compiz crash file too (_usr_bin_compiz.1000.crash)
  but without the 100Mo data of base64 core dumb…

  I'm using Ubuntu 14.04 AMD64.
  Graphics drivers: nvidia-331.113 (tested)

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