WARNING: at /build/buildd/linux-2.6.35/fs/sysfs/dir.c:451 sysfs_add_one+0xa1/0x110()

i didn't do anything special

ProblemType: KernelOops
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-20-generic 2.6.35-20.29
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.35-20.29-generic 2.6.35.4
Uname: Linux 2.6.35-20-generic i686
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: AD198x Analog [AD198x Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: sahak 1237 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfe020000 irq 46'
   Mixer name : 'Analog Devices AD1984'
   Components : 'HDA:11d41984,17aa20d6,00100400'
   Controls : 31
   Simple ctrls : 19
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7MHT25WW-1.03'
   Mixer name : 'ThinkPad EC 7MHT25WW-1.03'
   Components : ''
   Controls : 1
   Simple ctrls : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Tue Sep 7 10:57:54 2010
Failure: oops
Frequency: Once a day.
HibernationDevice: RESUME=UUID=326a3d95-83e8-4de1-b33e-e29a197ff82e
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta i386 (20100901.1)
MachineType: LENOVO 7675CTO
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-20-generic root=UUID=982d836e-5503-4c5b-8246-9d78c35e339b ro quiet splash
RelatedPackageVersions: linux-firmware 1.38
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.35/fs/sysfs/dir.c:451 sysfs_add_one+0xa1/0x110()
dmi.bios.date: 10/09/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 7NETC1WW (2.21 )
dmi.board.name: 7675CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7NETC1WW(2.21):bd10/09/2009:svnLENOVO:pn7675CTO:pvrThinkPadX61:rvnLENOVO:rn7675CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 7675CTO
dmi.product.version: ThinkPad X61
dmi.sys.vendor: LENOVO