Public bug reported:

suspend/resume issue

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-7-generic 2.6.38-7.39
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-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.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  vrvierra   1876 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0x58200000 irq 44'
   Mixer name   : 'Realtek ALC272X'
   Components   : 'HDA:10ec0272,10250349,00100001'
   Controls      : 16
   Simple ctrls  : 9
Date: Fri Apr  1 06:48:32 2011
Failure: oops
HibernationDevice: RESUME=UUID=24c8759f-bc25-4ecc-b4bd-85fa9aa83006
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: Acer AO532h
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-7-generic 
root=UUID=954b54da-f51b-48d9-b4f0-fdf35fa8eedc ro 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
RfKill:
 0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
SourcePackage: linux
Title: WARNING: at /build/buildd/linux-2.6.38/kernel/trace/ring_buffer.c:2169 
rb_reserve_next_event+0x209/0x230()
UpgradeStatus: Upgraded to natty on 2011-03-25 (6 days ago)
dmi.bios.date: 06/15/2010
dmi.bios.vendor: Acer
dmi.bios.version: V1.25
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: AO532h
dmi.board.vendor: Acer
dmi.board.version: V1.25
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.25
dmi.modalias: 
dmi:bvnAcer:bvrV1.25:bd06/15/2010:svnAcer:pnAO532h:pvrV1.25:rvnAcer:rnAO532h:rvrV1.25:cvnAcer:ct10:cvrV1.25:
dmi.product.name: AO532h
dmi.product.version: V1.25
dmi.sys.vendor: Acer

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


** Tags: apport-kerneloops i386 kernel-oops kernel-power natty 
needs-upstream-testing regression-release resume suspend

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https://bugs.launchpad.net/bugs/747204

Title:
  WARNING: at /build/buildd/linux-2.6.38/kernel/trace/ring_buffer.c:2169
  rb_reserve_next_event+0x209/0x230()

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