WARNING: at /build/buildd/linux-2.6.38/net/sched/sch_generic.c:256 dev_watchdog+0x2a0/0x2b0()

I was connected whit wifi when i plugged the ethernet cable and the kernel crashed.

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.41
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC271X Analog [ALC271X Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: cesare 1473 F.... pulseaudio
 /dev/snd/pcmC0D0p: cesare 1473 F...m pulseaudio
CRDA: Error: [Errno 2] File o directory non esistente
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf0800000 irq 42'
   Mixer name : 'Intel IbexPeak HDMI'
   Components : 'HDA:10ec0269,10250364,00100100 HDA:80862804,80860101,00100000'
   Controls : 22
   Simple ctrls : 11
Date: Mon Apr 11 13:05:13 2011
Failure: oops
HibernationDevice: RESUME=UUID=8b7eae16-6d3f-440c-9d46-bc2b044d10f2
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110319)
MachineType: Acer Aspire 3820
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=74eadb91-896a-410b-8bcb-3e62b5283687 ro acpi_osi=Linux quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic N/A
 linux-firmware 1.50
RfKill:
 0: phy0: 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+0x2a0/0x2b0()
UpgradeStatus: Upgraded to natty on 2011-04-04 (6 days ago)
dmi.bios.date: 04/06/2010
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: V1.08
dmi.board.name: Aspire 3820
dmi.board.vendor: Acer
dmi.board.version: Rev
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: Rev
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.08:bd04/06/2010:svnAcer:pnAspire3820:pvrRev:rvnAcer:rnAspire3820:rvrRev:cvnAcer:ct10:cvrRev:
dmi.product.name: Aspire 3820
dmi.product.version: Rev
dmi.sys.vendor: Acer