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

I have this problem almost every time i boot my computer. Many times it happens just after the boot.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: compiz-gnome 1:0.9.5.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-7.8-generic 3.0.0
Uname: Linux 3.0.0-7-generic i686
Architecture: i386
CasperVersion: 1.272
CompizPlugins: [core,bailer,detection,gtkloader,composite,opengl,debugspew,imgjpeg,compiztoolbox,decor,gnomecompat,grid,imgpng,mousepoll,move,place,regex,resize,session,staticswitcher,put,shift,dbus,thumbnail,water,imgsvg,obs,wobbly,resizeinfo,animation,workarounds,cube,scale,rotate,switcher,ring,unitymtgrabhandles,unityshell]
CompositorRunning: compiz
CrashCounter: 1
CurrentDmesg: Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
Date: Sat Jul 30 13:11:58 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
ExecutablePath: /usr/bin/unity-window-decorator
GraphicsCard:
 Intel Corporation 82946GZ/GL Integrated Graphics Controller [8086:2972] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Giga-byte Technology Device [1458:d000]
LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110727)
MachineType: Gigabyte Technology Co., Ltd. 946GMX-S2
ProcCmdline: /usr/bin/unity-window-decorator
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
SegvAnalysis:
 Segfault happened at: 0x8059437 <event_filter_func+583>: mov 0x174(%eax),%edx
 PC (0x08059437) ok
 source "0x174(%eax)" (0x00000174) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 event_filter_func ()
 ?? () from /usr/lib/i386-linux-gnu/libgdk-x11-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgdk-x11-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgdk-x11-2.0.so.0
 g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
Title: unity-window-decorator crashed with SIGSEGV in event_filter_func()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: admin
dmi.bios.date: 03/29/2007
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F1
dmi.board.name: 946GMX-S2
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF1:bd03/29/2007:svnGigabyteTechnologyCo.,Ltd.:pn946GMX-S2:pvr:rvnGigabyteTechnologyCo.,Ltd.:rn946GMX-S2:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: 946GMX-S2
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
peripherals:
 /desktop/gnome/peripherals/mouse:
   cursor_theme = DMZ-White
version.compiz: compiz 1:0.9.5.0-0ubuntu1
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11~1-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11~1-0ubuntu4
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 1:6.14.2-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.0-3ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1