compiz crashed with SIGSEGV

Binary package hint: compiz

no reasons , suddenly crashed.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: compiz-core 1:0.9.4+bzr20110411-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic-pae 2.6.38.2
Uname: Linux 2.6.38-8-generic-pae i686
NonfreeKernelModules: fglrx
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,resize,mousepoll,compiztoolbox,place,grid,vpswitch,regex,move,gnomecompat,snap,imgpng,wall,animation,session,workarounds,expo,ezoom,staticswitcher,fade,scale,unityshell]
CompositorRunning: compiz
CrashCounter: 1
Date: Wed Apr 13 18:48:38 2011
DistUpgraded: Log time: 2011-04-08 21:50:22.723565
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus:
 fglrx, 8.840, 2.6.38-8-generic, i686: installed
 fglrx, 8.840, 2.6.38-8-generic-pae, i686: installed
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 ATI Technologies Inc Mobility Radeon HD 3400 Series [1002:95c4] (prog-if 00 [VGA controller])
   Subsystem: Sony Corporation Device [104d:9035]
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
InstallationMedia_: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
JockeyStatus: xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Enabled, In use)
MachineType: Sony Corporation VGN-FW12G_B
ProcCmdline: compiz
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic-pae root=UUID=28ae01c1-6b35-426a-b522-7333927c42c2 ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-8.42-generic-pae 2.6.38.2
Renderer: Unknown
SegvAnalysis:
 Segfault happened at: 0xb5b866ef: mov (%esi),%edi
 PC (0xb5b866ef) ok
 source "(%esi)" (0xac7ff000) in non-readable VMA region: 0xac7ff000-0xac800000 ---p None
 destination "%edi" ok
SegvReason: reading VMA None
Signal: 11
SourcePackage: compiz
Stacktrace:
 #0 0xb5b866ef in ?? () from /usr/lib/fglrx/dri/fglrx_dri.so
 No symbol table info available.
 Cannot access memory at address 0x20dd
StacktraceTop: ?? () from /usr/lib/fglrx/dri/fglrx_dri.so
Title: compiz crashed with SIGSEGV
UpgradeStatus: Upgraded to natty on 2011-04-11 (1 days ago)
UserGroups: adm admin audio cdrom dialout dip fax fuse lpadmin netdev plugdev root sambashare tape video
dmi.bios.date: 10/07/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R0270Y0
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR0270Y0:bd10/07/2009:svnSonyCorporation:pnVGN-FW12G_B:pvrC600HR4U:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VGN-FW12G_B
dmi.product.version: C600HR4U
dmi.sys.vendor: Sony Corporation
version.compiz: compiz 1:0.9.4+bzr20110411-0ubuntu1
version.fglrx-installer: fglrx-installer N/A
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu1
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7