Kernel Oops - BUG: unable to handle kernel NULL pointer dereference at 0000009c; EIP is at __ticket_spin_lock+0x8/0x20

I right clicked on the Unity panel and selected eject for my thumb drive and I encountered the kernel error.

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: SB [HDA ATI SB], device 0: ALC272X Analog [ALC272X Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: SB [HDA ATI SB], device 0: ALC272X Analog [ALC272X Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: mram 1350 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'SB'/'HDA ATI SB at 0xd2300000 irq 16'
   Mixer name : 'Realtek ALC272X'
   Components : 'HDA:10ec0272,1025028d,00100001'
   Controls : 16
   Simple ctrls : 9
Date: Sat Apr 2 18:58:34 2011
Failure: oops
HibernationDevice: RESUME=UUID=32c9b5b9-f76d-4614-a548-ebac63e4c057
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
Lsusb:
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 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: Acer Aspire 5532
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-7-generic root=UUID=ee549bd8-00a7-4ce0-a212-c322e42b1aba 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: BUG: unable to handle kernel NULL pointer dereference at 0000009c
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/24/2009
dmi.bios.vendor: Acer
dmi.bios.version: V1.05
dmi.board.name: Aspire 5532
dmi.board.vendor: Acer
dmi.board.version: V1.05
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.05
dmi.modalias: dmi:bvnAcer:bvrV1.05:bd08/24/2009:svnAcer:pnAspire5532:pvrV1.05:rvnAcer:rnAspire5532:rvrV1.05:cvnAcer:ct10:cvrV1.05:
dmi.product.name: Aspire 5532
dmi.product.version: V1.05
dmi.sys.vendor: Acer