unity-window-decorator crashed with SIGSEGV in g_datalist_id_set_data_full() closing VLC

I opened VLC from the Unity launcher, and the display became corrupted (background went black). I couldn't close VLC using the button in its title bar, but could close it using the global menu File -> Quit.

However when I did that, unity-window-decorator crashed so all window decorations disappeared.

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

ApportVersion: 1.23-0ubuntu1
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,grid,gnomecompat,imgpng,move,place,regex,mousepoll,resize,snap,session,animation,unitymtgrabhandles,wall,expo,workarounds,fade,ezoom,scale,unityshell]
CompositorRunning: compiz
CrashCounter: 1
Date: Sat Sep 24 18:53:37 2011
DistUpgraded: Log time: 2011-09-24 12:54:52.255456
DistroCodename: oneiric
DistroVariant: ubuntu
ExecutablePath: /usr/bin/unity-window-decorator
GraphicsCard:
 nVidia Corporation G98 [GeForce 8400 GS] [10de:06e4] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:8321]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110901)
MachineType: System manufacturer P5QL PRO
ProcCmdline: /usr/bin/unity-window-decorator
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic-pae root=UUID=1936671f-434c-4e0b-ae97-19b4220ca63c ro quiet splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0xb6dfdfa4 <g_datalist_id_set_data_full+356>: mov 0x0(%ebp),%ecx
 PC (0xb6dfdfa4) 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_datalist_id_set_data_full () from /lib/i386-linux-gnu/libglib-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
 g_object_unref () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
Title: unity-window-decorator crashed with SIGSEGV in g_datalist_id_set_data_full()
UpgradeStatus: Upgraded to oneiric on 2011-09-24 (0 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 11/28/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0902
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5QL PRO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0902:bd11/28/2008:svnSystemmanufacturer:pnP5QLPRO:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5QLPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: P5QL PRO
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
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