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[Launchpad Bug Tracker <1363959@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package nux - 4.0.6+14.04.20141107-0ubuntu1

---------------
nux (4.0.6+14.04.20141107-0ubuntu1) trusty; urgency=low

  [ Marco Trevisan (Treviño) ]
  * WindowCompositor: don't try to use an null dnd_area pointer (LP:
    #1363959)
 -- Ubuntu daily release <ps-jenkins@xxxxxxxxxxxxxxxxxxx>   Fri, 07 Nov 2014 15:52:02 +0000

** Changed in: nux (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1363959

Title:
  compiz crashed with SIGSEGV in nux::WindowCompositor::DndEventCycle()

Status in Nux:
  Fix Committed
Status in Nux trusty series:
  In Progress
Status in nux package in Ubuntu:
  Fix Released
Status in nux source package in Trusty:
  Fix Released

Bug description:
  [Impact]

  An occasional unpredictable crash in the Unity shell occurs during a
  drag-and-drop operation.

  [Test Case]

  Unfortunately it is not possible to reproduce this bug at will.
  Apparently is is caused by an uninitialized pointer dereference that
  only occurs in a timing-dependent manner.

  Running a full autopilot test suite against the Unity desktop shell
  reveals no new regressions.

  [Regression Potential]

  The code change effectively adds a test for a null pointer.  It is
  possible that this might introduce a regression in drag-and-drop
  functionality that previously relied on undefined behaviour to work
  when it didn't crash.

  [Other Info]

  Fix was released with Ubuntu 14.10 and no new regressions have been
  reported.

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