unity-window-decorator crashed with SIGSEGV in g_data_set_internal()

[Removed by request]

crash after startup

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: compiz-gnome 1:0.9.5.94+bzr20110919-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu1
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,move,vpswitch,place,grid,snap,regex,resize,gnomecompat,animation,mousepoll,workarounds,imgpng,unitymtgrabhandles,expo,session,ezoom,wall,fade,scale,unityshell]
CompositorRunning: compiz
CrashCounter: 1
Date: Mon Sep 26 12:55:14 2011
DistUpgraded: Log time: 2011-08-02 16:06:17.390402
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.1.2, 3.0.0-10-generic, i686: installed
 virtualbox, 4.1.2, 3.0.0-11-generic, i686: installed
 virtualbox, 4.1.2, 3.0.0-12-generic, i686: installed
 virtualbox, 4.1.2, 3.0.0-9-generic, i686: installed
ExecutablePath: /usr/bin/unity-window-decorator
GraphicsCard:
 Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03) (prog-if 00 [VGA controller])
   Subsystem: Lenovo ThinkPad T60/R60 series [17aa:201a]
   Subsystem: Lenovo ThinkPad T60/R60 series [17aa:201a]
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: LENOVO 195144G
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdline: /usr/bin/unity-window-decorator
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-12-generic root=UUID=903f0cc2-ca61-4ffa-9e52-6c8f6ad2f740 ro quiet splash pcie_aspm=force vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x663fa4 <g_datalist_id_set_data_full+356>: mov 0x0(%ebp),%ecx
 PC (0x00663fa4) ok
 source "0x0(%ebp)" (0xaaaaaaa8) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 g_data_set_internal (dataset=0x0, new_destroy_func=0, new_data=0x0, key_id=52, datalist=0x84f3838) at /build/buildd/glib2.0-2.29.92/./glib/gdataset.c:372
 g_datalist_id_set_data_full (datalist=0x84f3838, key_id=52, data=0x0, destroy_func=0) at /build/buildd/glib2.0-2.29.92/./glib/gdataset.c:673
 g_object_real_dispose (object=0x84f3830) at /build/buildd/glib2.0-2.29.92/./gobject/gobject.c:895
 gtk_object_dispose (gobject=0x84f3830) at /build/buildd/gtk+2.0-2.24.6/gtk/gtkobject.c:426
 gtk_widget_dispose (object=0x84f3830) at /build/buildd/gtk+2.0-2.24.6/gtk/gtkwidget.c:8775
Title: unity-window-decorator crashed with SIGSEGV in g_data_set_internal()
UpgradeStatus: Upgraded to oneiric on 2011-09-22 (4 days ago)
UserGroups: adm admin cdrom dialout disk kmem lpadmin plugdev sambashare timidity
dmi.bios.date: 03/21/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 79ETE7WW (2.27 )
dmi.board.name: 195144G
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr79ETE7WW(2.27):bd03/21/2011:svnLENOVO:pn195144G:pvrThinkPadT60:rvnLENOVO:rn195144G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 195144G
dmi.product.version: ThinkPad T60
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.5.94+bzr20110919-0ubuntu1
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+7ubuntu7
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

[Removed by request (removed3500789)]

I actually openedv video in vlc, and after I closed it, compiz crashed.

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #807487, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.