WARNING: at /build/buildd/linux-2.6.38/net/sched/sch_generic.c:256 dev_watchdog+0x213/0x220()

crash error

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-7-generic 2.6.38-7.36
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-7.36-generic 2.6.38
Uname: Linux 2.6.38-7-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.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: ALC272X Analog [ALC272X Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: ALC272X Analog [ALC272X Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: omar 1278 F.... pulseaudio
CRDA: Error: [Errno 2] No existe el fichero o el directorio
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0x92300000 irq 16'
   Mixer name : 'Realtek ALC272X'
   Components : 'HDA:10ec0272,1025028d,00100001'
   Controls : 16
   Simple ctrls : 9
Date: Sat Mar 19 12:47:31 2011
Failure: oops
HibernationDevice: RESUME=UUID=664ecfc1-c196-4003-807f-451de3295bf1
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110302)
Lsusb:
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 002: ID 0458:003a KYE Systems Corp. (Mouse Systems) NetScroll+ Mini Traveler
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 004: ID 064e:a103 Suyin Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer Aspire 5517
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-7-generic root=UUID=94724d0b-8795-4b62-9dc6-9e066a0804a0 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-7-generic N/A
 linux-backports-modules-2.6.38-7-generic N/A
 linux-firmware 1.49
RfKill:
 0: brcmwl-0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.38/net/sched/sch_generic.c:256 dev_watchdog+0x213/0x220()
UpgradeStatus: Upgraded to natty on 2011-03-19 (0 days ago)
dmi.bios.date: 11/30/2009
dmi.bios.vendor: Acer
dmi.bios.version: V1.10
dmi.board.name: Aspire 5517
dmi.board.vendor: Acer
dmi.board.version: V1.10
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.10
dmi.modalias: dmi:bvnAcer:bvrV1.10:bd11/30/2009:svnAcer:pnAspire5517:pvrV1.10:rvnAcer:rnAspire5517:rvrV1.10:cvnAcer:ct10:cvrV1.10:
dmi.product.name: Aspire 5517
dmi.product.version: V1.10
dmi.sys.vendor: Acer