WARNING: at /build/buildd/linux-2.6.35/lib/kref.c:34 kref_get 0x21/0x30()

log out of guest account then back into user account caused crash

ProblemType: KernelOops
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-generic 2.6.35-22.33
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
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
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: mike 1690 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfe9fc000 irq 44'
   Mixer name : 'SigmaTel STAC9205'
   Components : 'HDA:838476a0,102801f1,00100204 HDA:14f12c06,14f1000f,00100000'
   Controls : 19
   Simple ctrls : 12
Date: Thu Sep 30 21:29:11 2010
Failure: oops
HibernationDevice: RESUME=UUID=8b1b50e8-34cd-44c0-bae8-859c6e000d2f
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: Dell Inc. Inspiron 1520
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=UUID=ca2ed207-204e-4071-81cc-7f4999805eac ro quiet splash
RelatedPackageVersions: linux-firmware 1.38
RfKill:
 0: dell-wifi: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.35/lib/kref.c:34 kref_get+0x21/0x30()
dmi.bios.date: 07/11/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: 0KY767
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA09:bd07/11/2008:svnDellInc.:pnInspiron1520:pvr:rvnDellInc.:rn0KY767:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 1520
dmi.sys.vendor: Dell Inc.