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

Happened right when I ran this script the first time:

#!/bin/sh
speaker-test &
pid1=$$
MONITOR=$(pactl list | grep -A2 '^Source #' | \
    grep 'Name: .*\.monitor$' | awk '{print $NF}' | tail -n1)
parec -d "$MONITOR" | sox -t raw -r 44100 -sLb 16 -c 2 - foo.wav &
pid2=$$
sleep 3
kill $pid1
kill $pid2

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.42
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: nvidia
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: ALC663 Analog [ALC663 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: dank 1423 F.... pulseaudio
 /dev/snd/pcmC0D0p: dank 1423 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf4900000 irq 43'
   Mixer name : 'Realtek ALC663'
   Components : 'HDA:10ec0663,10431333,00100001'
   Controls : 14
   Simple ctrls : 7
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xf3080000 irq 17'
   Mixer name : 'Nvidia GPU 0d HDMI/DP'
   Components : 'HDA:10de000d,10de0101,00100100'
   Controls : 16
   Simple ctrls : 4
Date: Thu Apr 14 16:12:36 2011
Failure: oops
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=05ea01a8-bff2-444c-8e54-248ce5285ef0
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110329.1)
Lsusb:
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 04f2:b071 Chicony Electronics Co., Ltd 2.0M UVC Webcam / CNF7129
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: ASUSTeK Computer Inc. G60JX
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=0941b44a-a9ad-4f5d-a22a-745943f4c4bd ro 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+0x213/0x220()
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/16/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 208
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: G60JX
dmi.board.vendor: PEGATRON CORPORATION
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: PEGATRON Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr208:bd08/16/2010:svnASUSTeKComputerInc.:pnG60JX:pvr1.0:rvnPEGATRONCORPORATION:rnG60JX:rvr1.0:cvnPEGATRONComputerInc.:ct10:cvr1.0:
dmi.product.name: G60JX
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.