[STAGING] oops after inserting USB stick with bad ext4 - BUG: unable to handle kernel paging request at 00f45000

Inserted a USB stick with one ext4 partition known to be bad. Log extract:

EXT4-fs warning (device sdc1): ext4_clear_journal_err: Filesystem error recorded from previous mount: IO fail
ure
EXT4-fs warning (device sdc1): ext4_clear_journal_err: Marking fs in need of filesystem check.
BUG: unable to handle kernel paging request at 00f45000
IP: [<c036278a>] __percpu_counter_sum+0x2a/0x70
*pde = 35ff2067 *pte = 00000000
Oops: 0000 [#1] SMP

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-23-generic 2.6.35-23.40
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-23.40-generic 2.6.35.7
Uname: Linux 2.6.35-23-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: gary 1929 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf7db8000 irq 44'
   Mixer name : 'Realtek ALC269'
   Components : 'HDA:10ec0269,104383ce,00100004'
   Controls : 10
   Simple ctrls : 6
Date: Wed Nov 24 01:52:56 2010
HibernationDevice: RESUME=UUID=d88eaf2c-06be-4d5c-902a-60b01092fe13
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100803.1)
MachineType: ASUSTeK Computer INC. 1001HA
ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.35-23-generic root=/dev/disk/by-uuid/f5885d9d-2738-4967-989c-ce62bc92c102 ro earlyprintk=vga,keep noatime
ProcEnviron:
 LANG=en_NZ.utf8
 SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.38
RfKill:

SourcePackage: linux
StagingDrivers: rt2860sta
Title: [STAGING]
dmi.bios.date: 02/26/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1401
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 1005HA
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer INC.
dmi.chassis.version: x.x
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1401:bd02/26/2010:svnASUSTeKComputerINC.:pn1001HA:pvrx.x:rvnASUSTeKComputerINC.:rn1005HA:rvrx.xx:cvnASUSTeKComputerINC.:ct10:cvrx.x:
dmi.product.name: 1001HA
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK Computer INC.