Public bug reported:

I just saw that warning after resuming from suspend to ram, but the
notebook continued working.

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-7-generic 2.6.38-7.39
Regression: No
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be 
restarted.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
   Subdevices: 2/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  fernando   1630 F.... pulseaudio
CRDA: Error: [Errno 2] No existe el fichero o el directorio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xd8820000 irq 48'
   Mixer name   : 'Analog Devices AD1984A'
   Components   : 'HDA:11d4194a,103c30db,00100400 
HDA:11c11040,103c1378,00100200'
   Controls      : 18
   Simple ctrls  : 11
Date: Sun Apr  3 19:18:22 2011
Failure: oops
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=b627350e-cc0b-4ae1-84ec-8380a177c7af
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110301.7)
MachineType: Hewlett-Packard HP EliteBook 6930p
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-7-generic 
root=/dev/mapper/vgHP-ubuntuRoot ro vga=791 splash quiet quiet splash 
vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-7-generic N/A
 linux-backports-modules-2.6.38-7-generic  N/A
 linux-firmware                            1.49
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.38/lib/kref.c:34 kref_get+0x2d/0x30()
UpgradeStatus: Upgraded to natty on 2011-04-01 (2 days ago)
dmi.bios.date: 12/08/2009
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68PCU Ver. F.16
dmi.board.name: 30DB
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 87.2A
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68PCUVer.F.16:bd12/08/2009:svnHewlett-Packard:pnHPEliteBook6930p:pvrF.16:rvnHewlett-Packard:rn30DB:rvrKBCVersion87.2A:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 6930p
dmi.product.version: F.16
dmi.sys.vendor: Hewlett-Packard

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


** Tags: amd64 apport-kerneloops kernel-oops kernel-power natty 
needs-upstream-testing resume suspend

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https://bugs.launchpad.net/bugs/749768

Title:
  WARNING: at /build/buildd/linux-2.6.38/lib/kref.c:34
  kref_get+0x2d/0x30()

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