This bug was fixed in the package compiz - 1:0.9.7.2-0ubuntu1

---------------
compiz (1:0.9.7.2-0ubuntu1) precise-proposed; urgency=low

  [ Łukasz 'sil2100' Zemczak ]
  * New upstream snapshot:
    - Fix global menu not being ergonomical on large screens (LP: #682788)
    - Fix Alt+Right arrow key (LP: #943612)
    - Fix key bindings for actions while doing tap detection (LP: #944631)
    - Window movement is erratic and buggy, backport (LP: #923683)
    - CompScreenImpl::addAction(CompAction*): Assertion `priv->initialized'
      failed (LP: #946118)
    - gtk-window-decorator crash with SIGSEGV in max_window_name_width()
      (LP: #937815)
    - Finish the implementation of the locally integrated menubars
      (LP: #931245)
    - Unity/compiz intercepts keystrokes from grabbed windows (LP: #806255)
    - Pressing alt doesn't show the menu title bar in top panel (LP: #943194)
    - Fix Alt stealing focus from widgets (LP: #943851)
    - Fix Alt + drag (LP: #945373)
    - lp:compiz-core fails parallel builds (make -jN) (LP: #938417)
    - Changing the HUD shortcut disables all Alt-based combinations. And
      changing the Dash shortcut disables all Super-based shortcuts
      (LP: #945816)
    - Fix key bindings (such as Super) not working on empty workspace or on
      slow/loaded systems (LP: #953089)
    - compiz crashed with signal 5 in Glib::exception_handlers_invoke()
      (LP: #808007)
    - Fix segfault caused by r3043 (LP: #958540)
  * Removed cherry-picked patches:
    - debian/patches/fix_806255.patch
    - debian/patches/fix_923683.patch
    - debian/patches/fix_943194.patch
    - debian/patches/fix_944631.patch
    - debian/patches/fix_alt_pressing.patch
    - debian/patches/additional_alt_tapping_fix.patch

  [ Didier Roche ]
  * pick upstream fix, debian/patches/fix_953839.patch:
    [regression] Invisible resize border is now only 1px wide (LP: #953839)
  * debian/patches/revert_lim.patch:
    - revert the integrated menu patch. It won't be released in precise and
      triggers a regression (in bug #962085)
  * debian/patches/fix_953089_2.patch:
    - second trial to fix remaining corner cases
  * debian/patches/exit_1_if_composite_cant_init.patch:
    - try to workaround a crasher which seems to happen when the composite
      plugin failed to initialize. Hopefully exiting 1 will make gnome-session
      respawning compiz and then the init will work. (LP: #833729)
  * debian/patches/always_replace.patch:
    - right now, always replace the current WM as it seems that some people
      got another compositor running at the start of the session. This will
      hopefully workaround the issue that some people experience.
 -- Didier Roche <[email protected]>   Fri, 23 Mar 2012 09:13:51 +0100

** Changed in: compiz (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/833729

Title:
  compiz crashed with SIGSEGV in CompositeScreen::compositingActive()

Status in Compiz Core:
  In Progress
Status in Unity:
  In Progress
Status in Unity Distro Priority:
  Fix Committed
Status in “compiz” package in Ubuntu:
  Fix Released
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  Crashes when used by /usr/lib/nux/unity_support_test

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: compiz-core 1:0.9.5.92+bzr2791-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
  Uname: Linux 3.0.0-9-generic x86_64
  Architecture: amd64
  CompizPlugins: 
[core,gtkloader,bailer,detection,composite,opengl,imgjpeg,compiztoolbox,decor,grid,mousepoll,wallpaper,resize,move,place,imgpng,imgsvg,gnomecompat,text,snap,wall,vpswitch,regex,session,thumbnail,unitymtgrabhandles,animation,expo,workarounds,ezoom,staticswitcher,fade,opacify,scale,unityshell]
  CompositorRunning: compiz
  CrashCounter: 1
  Date: Thu Aug 25 07:50:21 2011
  DistUpgraded: Log time: 2011-08-12 01:37:52.657651
  DistroCodename: oneiric
  DistroVariant: ubuntu
  ExecutablePath: /usr/bin/compiz
  GraphicsCard:
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 02) (prog-if 00 [VGA controller])
     Subsystem: Acer Incorporated [ALI] Device [1025:0487]
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 003: ID 04f2:b1d8 Chicony Electronics Co., Ltd
  MachineType: Acer Aspire 5742Z
  ProcCmdline: compiz
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-9-generic 
root=UUID=beff164b-12df-49d5-b810-f23d5495eb50 ro quiet splash vt.handoff=7
  SegvAnalysis:
   Segfault happened at: 0x7f2969ce32e0 
<_ZN15CompositeScreen17compositingActiveEv>:    mov    0x48(%rdi),%rax
   PC (0x7f2969ce32e0) ok
   source "0x48(%rdi)" (0x00000048) not located in a known VMA region (needed 
readable region)!
   destination "%rax" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: compiz
  StacktraceTop:
   CompositeScreen::compositingActive() () from /usr/lib/compiz/libcomposite.so
   PrivateCompositeWindow::PrivateCompositeWindow(CompWindow*, 
CompositeWindow*) () from /usr/lib/compiz/libcomposite.so
   CompositeWindow::CompositeWindow(CompWindow*) () from 
/usr/lib/compiz/libcomposite.so
   PluginClassHandler<CompositeWindow, CompWindow, 2>::get(CompWindow*) () from 
/usr/lib/compiz/libopengl.so
   PrivateGLWindow::PrivateGLWindow(CompWindow*, GLWindow*) () from 
/usr/lib/compiz/libopengl.so
  Title: compiz crashed with SIGSEGV in CompositeScreen::compositingActive()
  UpgradeStatus: Upgraded to oneiric on 2011-08-12 (13 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 01/10/2011
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.14
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire 5742Z
  dmi.board.vendor: Acer
  dmi.board.version: V1.14
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.14
  dmi.modalias: 
dmi:bvnAcer:bvrV1.14:bd01/10/2011:svnAcer:pnAspire5742Z:pvrV1.14:rvnAcer:rnAspire5742Z:rvrV1.14:cvnAcer:ct10:cvrV1.14:
  dmi.product.name: Aspire 5742Z
  dmi.product.version: V1.14
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.5.92+bzr2791-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu16
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20110811.g93fc084-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

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