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

just started after an uppgrade

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-7-generic 2.6.38-7.36
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-7.36-generic 2.6.38
Uname: Linux 2.6.38-7-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.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: SI7012 [SiS SI7012], device 0: Intel ICH [SiS SI7012]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: james 1289 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SI7012'/'SiS SI7012 with ALC203 at irq 18'
   Mixer name : 'Realtek ALC203 rev 0'
   Components : 'AC97a:414c4770'
   Controls : 31
   Simple ctrls : 20
Date: Mon Mar 21 05:26:53 2011
Failure: oops
Frequency: I don't know.
HibernationDevice: RESUME=UUID=12802fb8-4a02-4dbd-8eff-294bde085cbe
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110302)
Lsusb:
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer, inc. Aspire 5000
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-7-generic root=UUID=5e6c6f27-d516-4b69-b9ec-e9a53a3f9ee6 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: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: yes
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.38/net/sched/sch_generic.c:256 dev_watchdog+0x2a0/0x2b0()
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/20/06
dmi.bios.vendor: Acer
dmi.bios.version: 3A32
dmi.board.name: Lugano M
dmi.board.vendor: Acer, Inc.
dmi.board.version: Not Applicable
dmi.chassis.type: 1
dmi.chassis.vendor: , Inc.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAcer:bvr3A32:bd02/20/06:svnAcer,inc.:pnAspire5000:pvrNotApplicable:rvnAcer,Inc.:rnLuganoM:rvrNotApplicable:cvn,Inc.:ct1:cvrN/A:
dmi.product.name: Aspire 5000
dmi.product.version: Not Applicable
dmi.sys.vendor: Acer, inc.