Xorg crashed with SIGSEGV in <signal handler called>()

[ebeneezer]

9.10 karmic koala. upgrade from jaunty.

virtualbox.

Unable to log off or restart. This requires a hard shut down of the vm.

Any workarounds?

ProblemType: Crash
Architecture: amd64
CrashCounter: 1
Date: Wed Jul 29 22:41:38 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/Xorg
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: innotek GmbH VirtualBox
Package: xserver-xorg-core 2:1.6.1.901-2ubuntu2
PciDisplay:
 00:02.0 VGA compatible controller [0300]: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter [80ee:beef]
  Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
  Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
  Latency: 64
  Region 0: Memory at e0000000 (32-bit, prefetchable) [size=32M]
ProcCmdLine: root=UUID=e1610264-6dff-4cec-a47d-bd483f3a03fd ro
ProcCmdline: /usr/bin/X :0 -br -verbose -auth /var/run/gdm/auth-for-gdm-6Hy61u/database -nolisten tcp
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
ProcVersionSignature: Ubuntu 2.6.31-4.23-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu5
 libgl1-mesa-glx 7.5-1ubuntu1
 libdrm2 2.4.12-1ubuntu1
 xserver-xorg-video-intel 2:2.8.0-0ubuntu1
 xserver-xorg-video-ati 1:6.12.99+git20090629.f39cafc5-0ubuntu1
SegvAnalysis:
 Segfault happened at: 0x7febf06e8eef: cmpb $0x48,(%rax)
 PC (0x7febf06e8eef) ok
 source "$0x48" ok
 destination "(%rax)" (0x7febf2df7eb0) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: xorg-server
StacktraceTop:
 ?? ()
 <signal handler called>
 select () from /lib/libc.so.6
 WaitForSomething ()
 Dispatch ()
Title: Xorg crashed with SIGSEGV in <signal handler called>()
Uname: Linux 2.6.31-4-generic x86_64
UserGroups:

dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH
fglrx: Not loaded
system:
 distro: Ubuntu
 architecture: x86_64kernel: 2.6.31-4-generic

[Apport retracing service (apport)]

StacktraceTop:?? ()
<signal handler called>
__select_nocancel () from /lib/libc.so.6
WaitForSomething (
Dispatch () at ../../dix/dispatch.c:367