Kernel Oops - BUG: unable to handle kernel paging request at 11bbcedc; EIP is at nouveau_fence_update+0x2e/0xe0 [nouveau]

I 'm not very sure about this, but I think it is related to Flash content, since today I have more crash from Flash when I try to play flash video on youtube. I had a kernel panic , I could take a pic , I was redirected to tty automatically.

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-6-generic 2.6.38-6.34
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-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.
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: natty 8239 F.... pulseaudio
 /dev/snd/controlC0: natty 8239 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'CMI8738'/'C-Media CMI8738 (model 55) at 0xb800, irq 22'
   Mixer name : 'CMedia PCI'
   Components : ''
   Controls : 41
   Simple ctrls : 22
Card1.Amixer.info:
 Card hw:1 'ICH5'/'Intel ICH5 with AD1981B at irq 17'
   Mixer name : 'Analog Devices AD1981B'
   Components : 'AC97a:41445374'
   Controls : 34
   Simple ctrls : 23
Date: Tue Mar 15 11:27:47 2011
Failure: oops
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=b2865ca4-cd7e-4887-a086-97bb310ed1e4
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110212)
MachineType: Sony Corporation PCV-RSM22(CE)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-6-generic root=UUID=90589526-606e-4213-97b7-f0b5d7b613eb ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-6-generic N/A
 linux-backports-modules-2.6.38-6-generic N/A
 linux-firmware 1.48
SourcePackage: linux
Title: BUG: unable to handle kernel paging request at 11bbcedc
UpgradeStatus: Upgraded to natty on 2011-02-24 (18 days ago)
dmi.bios.date: 06/26/2003
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1006
dmi.board.name: P4SD-VX
dmi.board.vendor: ASUSTek Computer Inc.
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: RS
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1006:bd06/26/2003:svnSonyCorporation:pnPCV-RSM22(CE):pvrToBeFilledByO.E.M.:rvnASUSTekComputerInc.:rnP4SD-VX:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrRS:
dmi.product.name: PCV-RSM22(CE)
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: Sony Corporation