Kernel Stack Trace when booting

[lpearce]

When I updated to kernel 2.6.38-11, my computer no longer boots; instead it gives the attached stack trace (copied from kern.log).
When this happens, I do a hard reboot and select the old kernel, 2.6.38-10, in grub and everything works fine.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-11-generic 2.6.38-11.48
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: lauren 1410 F.... xfce4-volumed
                      lauren 1437 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xc7500000 irq 55'
   Mixer name : 'Intel CougarPoint HDMI'
   Components : 'HDA:111d7605,103c1656,00100105 HDA:80862805,80860101,00100000'
   Controls : 18
   Simple ctrls : 10
Date: Sun Aug 21 15:02:20 2011
HibernationDevice: RESUME=UUID=6ddb8958-9f0f-46fe-8dd5-75fb53fd896d
InstallationMedia: Xubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
MachineType: Hewlett-Packard HP Pavilion dv6 Notebook PC
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-10-generic root=UUID=c7c5eeec-c41d-44bd-8ada-bc4bbb0e7992 ro
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-10-generic N/A
 linux-backports-modules-2.6.38-10-generic N/A
 linux-firmware 1.52
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
StagingDrivers: rts_pstor
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/24/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.17
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 1656
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 10.2F
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.17:bd06/24/2011:svnHewlett-Packard:pnHPPaviliondv6NotebookPC:pvr058C110000244720001620100:rvnHewlett-Packard:rn1656:rvr10.2F:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion dv6 Notebook PC
dmi.product.version: 058C110000244720001620100
dmi.sys.vendor: Hewlett-Packard