This problem occured directly after a reboot of my system.

[TimoR]

I can't offer more detailed information. But I had a similar problem yesterday and inserted the crash log file as attachment. I hope that file can be helpfully, too.

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: timo 5658 F.... knotify4
                      timo 5745 F.... pulseaudio
                      timo 5766 F.... kmix
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: Sat Oct 31 21:46:07 2009
DistroRelease: Ubuntu 9.10
Failure: oops
HibernationDevice: RESUME=UUID=56bcd5ff-62a7-40d3-b0d4-340653e3c505
MachineType: Dell Inc. Inspiron 9300
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: root=UUID=99a5ace3-0d45-4f3d-98ac-935c7b521d0a ro locale=de_DE 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:

SourcePackage: linux
Tags: kernel-oops
Title: WARNING: at /build/buildd/linux-2.6.31/fs/notify/inotify/inotify_fsnotify.c:129 idr_callback+0x4f/0x80()
Uname: Linux 2.6.31-14-generic i686
WpaSupplicantLog:

dmi.bios.date: 06/21/2005
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0C5668
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd06/21/2005:svnDellInc.:pnInspiron9300:pvr:rvnDellInc.:rn0C5668:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 9300
dmi.sys.vendor: Dell Inc.

[Leann Ogasawara (leannogasawara)]

Hi TimoR,

The warning reported in the attached OopsText.txt log appears to have been resolved with a patch from upstream. A test kernel containing the patch has been posted to bug 442966. As a result I'm marking this as a duplicate to bug 442966. Please continue to track this issue at that report and report any testing feedback there. If you reported an issue that is unrelated to this warning, please open a new bug. Thanks!

[This is an automated message. Apologies if it has reached you inappropriately.]