WARNING: at /build/buildd/linux-2.6.31/net/mac80211/agg-tx.c:145 ___ieee80211_stop_tx_ba_session+0x89/0xa0 [mac80211]()

[bubu1uk]

fresh install. just started to set up system to my needs and installing few apps, then i got crash report. no app crashed. I have no idea what caused it.

ProblemType: KernelOops
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: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: eihnat 2457 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebfc000 irq 21'
   Mixer name : 'SigmaTel STAC9205'
   Components : 'HDA:838476a0,102801f2,00100204 HDA:14f12c06,14f1000f,00100000'
   Controls : 23
   Simple ctrls : 14
Date: Fri Oct 30 20:21:08 2009
DistroRelease: Ubuntu 9.10
Failure: oops
HibernationDevice: RESUME=UUID=50347e89-d2a4-4fa1-af42-56358ff08480
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
MachineType: Dell Inc. Inspiron 1720
Package: linux-image-2.6.31-14-generic 2.6.31-14.48
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-14-generic root=UUID=9342eb31-8088-46d6-80f2-bbba413e86f4 ro quiet splash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 linux-backports-modules-2.6.31-14-generic N/A
 linux-firmware 1.24
SourcePackage: linux
Tags: kernel-oops
Title: WARNING: at /build/buildd/linux-2.6.31/net/mac80211/agg-tx.c:145 ___ieee80211_stop_tx_ba_session+0x89/0xa0 [mac80211]()
Uname: Linux 2.6.31-14-generic i686
dmi.bios.date: 02/03/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0UK437
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd02/03/2008:svnDellInc.:pnInspiron1720:pvr:rvnDellInc.:rn0UK437:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 1720
dmi.sys.vendor: Dell Inc.