BUG: unable to handle kernel NULL pointer dereference at 00000148

problem turns up when a video is started

ProblemType: KernelOops
Annotation: Your system might become unstable now and might need to be restarted.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 0/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xde400000 irq 21'
   Mixer name : 'SigmaTel CXD9872RD/K'
   Components : 'HDA:83847661,104d0700,00104201 HDA:14f12bfa,104d0200,00090000'
   Controls : 13
   Simple ctrls : 9
Date: Fri Sep 25 18:50:42 2009
DistroRelease: Ubuntu 9.10
Failure: oops
MachineType: Sony Corporation VGN-SZ1M_B
NonfreeKernelModules: nvidia
Package: linux-image-2.6.31-10-generic 2.6.31-10.35
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-10-generic root=UUID=8bfd8f00-bdae-425e-930c-0796e5816513 ro quiet splash
ProcVersionSignature: Ubuntu 2.6.31-10.35-generic
RelatedPackageVersions:
 linux-backports-modules-2.6.31-10-generic N/A
 linux-firmware 1.19
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: yes
SourcePackage: linux
Tags: kernel-oops
Title: BUG: unable to handle kernel NULL pointer dereference at 00000148
Uname: Linux 2.6.31-10-generic i686
dmi.bios.date: 07/10/2006
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: R0083N0
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrR0083N0:bd07/10/2006:svnSonyCorporation:pnVGN-SZ1M_B:pvrJ001D30E:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VGN-SZ1M_B
dmi.product.version: J001D30E
dmi.sys.vendor: Sony Corporation