WARNING: at /build/buildd/linux-2.6.38/fs/buffer.c:1151 mark_buffer_dirty 0x75/0x90()

I don't know. Error window just appears, I don't even know what exactly is broken.

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.41
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
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: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ewro 1237 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf6ffc000 irq 47'
   Mixer name : 'IDT 92HD73C1X5'
   Components : 'HDA:111d7675,10280254,00100202'
   Controls : 16
   Simple ctrls : 10
Card1.Amixer.info:
 Card hw:1 'HDMI'/'HDA ATI HDMI at 0xf6dec000 irq 49'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100000'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Sat Apr 9 21:26:33 2011
Failure: oops
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=62a77dc1-a5dc-46a9-bb02-239245ebf650
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110302)
MachineType: Dell Inc. Studio 1535
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=aee5859a-8064-4d8e-b7d9-00892c3ab595 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic N/A
 linux-firmware 1.50
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.38/fs/buffer.c:1151 mark_buffer_dirty+0x75/0x90()
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/30/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.name: 0H282K
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd07/30/2008:svnDellInc.:pnStudio1535:pvr:rvnDellInc.:rn0H282K:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Studio 1535
dmi.sys.vendor: Dell Inc.