WARNING: at /build/buildd/linux-2.6.31/fs/buffer.c:1152 mark_buffer_dirty+0x70/0x90()

look,I have no idea how this is working... I just try to help you with this report.

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: anna 1345 F.... pulseaudio
 /dev/snd/pcmC0D0p: anna 1345 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'I82801DBICH4'/'Intel 82801DB-ICH4 with AD1981B at irq 17'
   Mixer name : 'Analog Devices AD1981B'
   Components : 'AC97a:41445374'
   Controls : 28
   Simple ctrls : 20
Date: Tue Nov 3 00:38:28 2009
DistroRelease: Ubuntu 9.10
Failure: oops
HibernationDevice: RESUME=UUID=777554df-0332-43dc-b3a3-605d1a33cb5d
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 002: ID 0421:0041 Nokia Mobile Phones
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: IBM 23718EG
Package: linux-image-2.6.31-14-generic 2.6.31-14.48
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-14-generic root=UUID=ed2aa0b7-10a6-4e92-b361-0401266b7cdc 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
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
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 2.6.31-14-generic i686
dmi.bios.date: 10/13/2004
dmi.bios.vendor: IBM
dmi.bios.version: 1UET93WW (1.43 )
dmi.board.name: 23718EG
dmi.board.vendor: IBM
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: IBM
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnIBM:bvr1UET93WW(1.43):bd10/13/2004:svnIBM:pn23718EG:pvrThinkPadX40:rvnIBM:rn23718EG:rvrNotAvailable:cvnIBM:ct10:cvrNotAvailable:
dmi.product.name: 23718EG
dmi.product.version: ThinkPad X40
dmi.sys.vendor: IBM