kernel oops message while working with firefox & eclipse

I was working with firefox & eclipse and got this kernel oops message saying that I might need to reboot to be secure.
Everything seems ok thought.
Using karmic uptodate.

ProblemType: KernelOops
Annotation: Your system might become unstable now and might need to be restarted.
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: dodokal 2479 F.... pulseaudio
 /dev/snd/pcmC0D0p: dodokal 2479 F...m pulseaudio
CRDA: Error: [Errno 2] Aucun fichier ou dossier de ce type
Card0.Amixer.info:
 Card hw:0 'ICH6'/'Intel ICH6 with AD1981B at irq 23'
   Mixer name : 'Analog Devices AD1981B'
   Components : 'AC97a:41445374'
   Controls : 28
   Simple ctrls : 20
Date: Tue Oct 6 13:48:18 2009
DistroRelease: Ubuntu 9.10
Failure: oops
HibernationDevice: RESUME=UUID=f9e15adb-a0b7-4c11-aaf3-1a7ebcdc4b5a
IwConfig:
 lo no wireless extensions.

 eth1 no wireless extensions.

 vboxnet0 no wireless extensions.
MachineType: Dell Inc. OptiPlex GX280
Package: linux-image-2.6.31-11-generic 2.6.31-11.38
ProcCmdLine: root=UUID=9c580cb7-9021-4f89-b225-a5dd757a7513 ro quiet splash
ProcVersionSignature: Ubuntu 2.6.31-11.38-generic
RelatedPackageVersions:
 linux-backports-modules-2.6.31-11-generic N/A
 linux-firmware 1.20
RfKill:

SourcePackage: linux
Tags: kernel-oops
Title: WARNING: at /build/buildd/linux-2.6.31/fs/buffer.c:1152 mark_buffer_dirty+0x70/0x90()
Uname: Linux 2.6.31-11-generic i686
WpaSupplicantLog:

dmi.bios.date: 02/09/2005
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0C7195
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd02/09/2005:svnDellInc.:pnOptiPlexGX280:pvr:rvnDellInc.:rn0C7195:rvr:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex GX280
dmi.sys.vendor: Dell Inc.