Public bug reported:

There are several other bug reports mentioning this same warning, but
none of them seemed to have the same lead-up of previous events so I am
filing separately for the moment.

In my case I had just plugged in a USB hard drive with two partitions on
it, one ext3 and one NTFS. Both automounted and the contents were
displayed in Nautilus. I then clicked into one of the directories on the
ext3 partition, the drives vanished, and I got the apport alert. Prior
to the warning there are a series of USB, sd and ext3 errors in the log
which I will attach.

The drive had worked fine earlier in the day, but it's entirely possible
it's faulty.

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:  martin     2249 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'ICH6'/'Intel ICH6 with STAC9750,51 at irq 16'
   Mixer name   : 'SigmaTel STAC9750,51'
   Components   : 'AC97a:83847650'
   Controls      : 38
   Simple ctrls  : 24
Date: Wed Oct 28 23:33:47 2009
DistroRelease: Ubuntu 9.10
Failure: oops
HibernationDevice: RESUME=UUID=0c8dd32e-dbb1-4309-a8b8-bfcf466f9b15
Lsusb:
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 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
 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Latitude D610
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=/vmlinuz-2.6.31-14-generic 
root=UUID=222f46cf-e3d6-4f14-9bfc-3f4497960a8b ro
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 linux-backports-modules-2.6.31-14-generic N/A
 linux-firmware 1.24
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 2.6.31-14-generic i686
WpaSupplicantLog:
 
dmi.bios.date: 10/02/2005
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: 0K3879
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd10/02/2005:svnDellInc.:pnLatitudeD610:pvr:rvnDellInc.:rn0K3879:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude D610
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-kerneloops i386 kernel-oops

-- 
USB hard disk errors followed by kernel WARNING: at 
/build/buildd/linux-2.6.31/fs/buffer.c:1152 mark_buffer_dirty+0x70/0x90()
https://bugs.launchpad.net/bugs/462986
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