WARNING: at /build/buildd/linux-2.6.38/net/mac80211/tx.c:661 ieee80211_tx_h_rate_ctrl+0x498/0x500 [mac80211]()

Restarted system after software update and got the crash notice. FWIW, I'm using Ubuntu Desktop Classic on a CR-48 with a re-flashed BIOS, and the system is set to automatically log me in.

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-6-generic 2.6.38-6.34
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-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: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: pwnall 1339 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0x98200000 irq 46'
   Mixer name : 'Realtek ALC272'
   Components : 'HDA:10ec0272,11702852,00100001'
   Controls : 16
   Simple ctrls : 9
Date: Fri Mar 11 23:06:17 2011
Failure: oops
Frequency: Once a day.
HibernationDevice: RESUME=UUID=0626b7cd-405d-4cd8-841c-4a378b8a2935
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110210)
MachineType: IEC PineTrail
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-6-generic root=UUID=268ac8e3-db5f-4157-b01b-34571451852b ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-6-generic N/A
 linux-backports-modules-2.6.38-6-generic N/A
 linux-firmware 1.48
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.38/net/mac80211/tx.c:661 ieee80211_tx_h_rate_ctrl+0x498/0x500 [mac80211]()
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/27/2010
dmi.bios.vendor: IEC
dmi.bios.version: 0.08
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Base Board Product Name
dmi.board.vendor: IEC
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnIEC:bvr0.08:bd10/27/2010:svnIEC:pnPineTrail:pvr0.08:rvnIEC:rnBaseBoardProductName:rvrBaseBoardVersion:cvnChassisManufacturer:ct1:cvrChassisVersion:
dmi.product.name: PineTrail
dmi.product.version: 0.08
dmi.sys.vendor: IEC