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[Launchpad Bug Tracker <1337244@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package nux - 4.0.6+14.04.20140930-0ubuntu1

---------------
nux (4.0.6+14.04.20140930-0ubuntu1) trusty; urgency=low

  [ Erkin Bahceci ]
  * Area: always make sure we remove and object from layout queue. (LP:
    #1337244)

  [ Marco Trevisan (Treviño) ]
  * ScrollView: correctly handle vertical and horizontal scrolling. (LP:
    #1228093)
 -- Ubuntu daily release <ps-jenkins@xxxxxxxxxxxxxxxxxxx>   Tue, 30 Sep 2014 16:05:28 +0000

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

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https://bugs.launchpad.net/bugs/1337244

Title:
  compiz crashed with SIGSEGV in
  nux::WindowThread::ComputeQueuedLayout()

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]
  Unity crashes when unlocking the session

  [Test case 1]
  1. Lock the session
  2. Unlock the session
  3. No crash should happen

  [Test case 2]
  1. Use unity in multi-monitor setup
  2. Lock the session
  3. Detach one of the monitors
  4. Make sure the lockscreen updates (sometimes it's needed to switch to tty1 and back)
  5. No crash should happen

  [Regression potential]
  None

  Hi, this is basically the same bug as
  https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1298202, but that
  bug is marked as Fix Released with Unity 7.2.0, and I'm still seeing
  this bug on trusty, with the latest Unity version (unity
  7.2.1+14.04.20140513-0ubuntu2).  I already mentioned in that bug that
  I was still seeing it quite a while ago, but got no reply to that.

  Crashes are being experienced in multiple machines, while unlocking
  the screen.  The stacktraces vary, but they always fail in the same
  function and same line.

  First stacktrace:
  #0  0x0000000000000410 in ?? ()
  #1  0x00007fd4bf4eb75d in nux::WindowThread::ComputeQueuedLayout (this=this@entry=0x22c1990) at ./WindowThread.cpp:318
  #2  0x00007fd4bf4ecb28 in nux::WindowThread::RenderInterfaceFromForeignCmd (this=0x22c1990, clip=...) at ./WindowThread.cpp:1627
  #3  0x00007fd4c0c20389 in unity::UnityScreen::paintDisplay() () from /usr/lib/compiz/libunityshell.so
  #4  0x00007fd4c0c20748 in unity::UnityScreen::glPaintOutput(GLScreenPaintAttrib const&, GLMatrix const&, CompRegion const&, CompOutput*, unsigned int)
     () from /usr/lib/compiz/libunityshell.so
  #5  0x00007fd4d4f2e272 in GLScreen::glPaintOutput(GLScreenPaintAttrib const&, GLMatrix const&, CompRegion const&, CompOutput*, unsigned int) ()
    from /usr/lib/compiz/libopengl.so
  #6  0x00007fd4d4f2eed4 in PrivateGLScreen::paintOutputs(std::list<CompOutput*, std::allocator<CompOutput*> >&, unsigned int, CompRegion const&) ()
    from /usr/lib/compiz/libopengl.so
  #7  0x00007fd4d556944f in CompositeScreen::paint(std::list<CompOutput*, std::allocator<CompOutput*> >&, unsigned int) ()
    from /usr/lib/compiz/libcomposite.so
  #8  0x00007fd4d556caf2 in CompositeScreen::handlePaintTimeout() () from /usr/lib/compiz/libcomposite.so
  #9  0x00007fd4e12c053d in CompTimer::triggerCallback() () from /usr/lib/libcompiz_core.so.ABI-20140123
  #10 0x00007fd4e12c05ef in CompTimeoutSource::callback() () from /usr/lib/libcompiz_core.so.ABI-20140123
  #11 0x00007fd4e12bfb4d in CompTimeoutSource::dispatch(sigc::slot_base*) () from /usr/lib/libcompiz_core.so.ABI-20140123
  #12 0x00007fd4df7ac35f in Glib::Source::dispatch_vfunc(_GSource*, int (*)(void*), void*) () from /usr/lib/x86_64-linux-gnu/libglibmm-2.4.so.1
  #13 0x00007fd4df29ece5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #14 0x00007fd4df29f048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #15 0x00007fd4df29f30a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #16 0x00007fd4e127b0eb in compiz::private_screen::EventManager::startEventLoop(_XDisplay*) () from /usr/lib/libcompiz_core.so.ABI-20140123
  #17 0x0000000000401971 in main ()

  Second stacktrace (different machine):
  #0  0x00007f0058407ed0 in nux_area_accessible_check_pending_notification () from /usr/lib/compiz/libunityshell.so
  #1  0x00007f0056cb175d in nux::WindowThread::ComputeQueuedLayout (this=this@entry=0x1d530e0) at ./WindowThread.cpp:318
  #2  0x00007f0056cb2b28 in nux::WindowThread::RenderInterfaceFromForeignCmd (this=0x1d530e0, clip=...) at ./WindowThread.cpp:1627
  #3  0x00007f00583e6389 in unity::UnityScreen::paintDisplay() () from /usr/lib/compiz/libunityshell.so
  #4  0x00007f00583e6748 in unity::UnityScreen::glPaintOutput(GLScreenPaintAttrib const&, GLMatrix const&, CompRegion const&, CompOutput*, unsigned int) () from /usr/lib/compiz/libunityshell.so
  #5  0x00007f00705e2272 in GLScreen::glPaintOutput(GLScreenPaintAttrib const&, GLMatrix const&, CompRegion const&, CompOutput*, unsigned int) ()
    from /usr/lib/compiz/libopengl.so
  #6  0x00007f00705e2ed4 in PrivateGLScreen::paintOutputs(std::list<CompOutput*, std::allocator<CompOutput*> >&, unsigned int, CompRegion const&) ()
    from /usr/lib/compiz/libopengl.so
  #7  0x00007f0070c1d44f in CompositeScreen::paint(std::list<CompOutput*, std::allocator<CompOutput*> >&, unsigned int) ()
    from /usr/lib/compiz/libcomposite.so
  #8  0x00007f0070c20af2 in CompositeScreen::handlePaintTimeout() () from /usr/lib/compiz/libcomposite.so
  #9  0x00007f007879b53d in CompTimer::triggerCallback() () from /usr/lib/libcompiz_core.so.ABI-20140123
  #10 0x00007f007879b5ef in CompTimeoutSource::callback() () from /usr/lib/libcompiz_core.so.ABI-20140123
  #11 0x00007f007879ab4d in CompTimeoutSource::dispatch(sigc::slot_base*) () from /usr/lib/libcompiz_core.so.ABI-20140123
  #12 0x00007f0076c8735f in Glib::Source::dispatch_vfunc(_GSource*, int (*)(void*), void*) () from /usr/lib/x86_64-linux-gnu/libglibmm-2.4.so.1
  #13 0x00007f0076779ce5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #14 0x00007f007677a048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #15 0x00007f007677a30a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #16 0x00007f00787560eb in compiz::private_screen::EventManager::startEventLoop(_XDisplay*) () from /usr/lib/libcompiz_core.so.ABI-20140123
  #17 0x0000000000401971 in main ()

  I have more, but I don't know how useful it is to add them all.

  All stacktraces have this as #1:
  #1 0x00007fd4bf4eb75d in nux::WindowThread::ComputeQueuedLayout (this=this@entry=0x22c1990) at ./WindowThread.cpp:318

  This is the affected code:

  void WindowThread::ComputeQueuedLayout()
   {
     StartLayoutCycle();
     std::list<Area *>::iterator it;

     for (it = _queued_layout_list.begin(); it != _queued_layout_list.end(); ++it)
     {
       Area *area = *it;

       if (area->Type().IsDerivedFromType(View::StaticObjectType))

  The last line is 318.

  I expect there is some item in the _queued_layout_list that is getting
  corrupted.

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