Xorg crashed with SIGABRT in raise()

[Bob Bib]

Crashed while logging out from guest user.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: xserver-xorg-core 2:1.11.4-0ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Fri Mar 16 04:14:16 2012
DistUpgraded: Log time: 2012-03-07 20:40:21.644558
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus: vboxhost, 4.1.10, 3.2.0-18-generic, x86_64: installed
ExecutablePath: /usr/bin/Xorg
GraphicsCard:
 Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:0229]
   Subsystem: Acer Incorporated [ALI] Device [1025:0229]
MachineType: Acer Aspire 3810T
ProcCmdline: /usr/bin/X :1 -auth /var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
ProcEnviron:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic root=UUID=dc688c32-80f7-4172-bd1d-4234bb54973e ro i8042.reset=1
Signal: 6
SourcePackage: xorg-server
Stacktrace:
 #0 0x00007f46bdf61445 in raise () from /lib/x86_64-linux-gnu/libc.so.6
 No symbol table info available.
 Cannot access memory at address 0x7fff75796e28
StacktraceTop: raise () from /lib/x86_64-linux-gnu/libc.so.6
ThreadStacktrace:
 .
 Thread 1 (Thread 0x7f46bfd62880 (LWP 10833)):
 #0 0x00007f46bdf61445 in raise () from /lib/x86_64-linux-gnu/libc.so.6
 No symbol table info available.
 Cannot access memory at address 0x7fff75796e28
Title: Xorg crashed with SIGABRT in raise()
UpgradeStatus: Upgraded to precise on 2012-03-07 (8 days ago)
UserGroups:

dmi.bios.date: 08/10/2010
dmi.bios.vendor: Acer
dmi.bios.version: V1.28
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Aspire 3810T
dmi.board.vendor: Acer
dmi.board.version: PSMBOU-1234567
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: None
dmi.modalias: dmi:bvnAcer:bvrV1.28:bd08/10/2010:svnAcer:pnAspire3810T:pvrV1.28:rvnAcer:rnAspire3810T:rvrPSMBOU-1234567:cvnAcer:ct10:cvrNone:
dmi.product.name: Aspire 3810T
dmi.product.version: V1.28
dmi.sys.vendor: Acer
version.compiz: compiz N/A
version.ia32-libs: ia32-libs 20090808ubuntu34
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901+git20120126-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #933504, 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.