kernel panic when safely removing external USB HD

When clicking on "Safely remove" on my USB external HD on the launcher, I get this message:
Kernel panic - not syncing: Fatal exception in interrupt Pid: 9 Comm: ksoftirqd/1 Tainted G D 3.0.8.9 - generic # 2 ubuntu....
panic occured, switching back to text console.
I cannot get a screenshot as my pc gets blocked on a black terminal, can't do anything but reboot manually.
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: charlie 2357 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xdbff8000 irq 22'
   Mixer name : 'Analog Devices AD1988'
   Components : 'HDA:11d41988,10438241,00100400'
   Controls : 36
   Simple ctrls : 21
DistroRelease: Ubuntu 11.10
HibernationDevice: RESUME=UUID=370b4504-ac8b-49f5-b54b-052fa5b01b25
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
IwConfig: Error: [Errno 2] No such file or directory
MachineType: System manufacturer System Product Name
Package: linux (not installed)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-9-generic root=UUID=1ab3c2d9-9b38-4502-9e2a-434ec6833169 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.0.0-9.12-generic 3.0.3
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-9-generic N/A
 linux-backports-modules-3.0.0-9-generic N/A
 linux-firmware 1.59
RfKill: Error: [Errno 2] No such file or directory
Tags: oneiric running-unity
UdevDb: Error: [Errno 2] No such file or directory
Uname: Linux 3.0.0-9-generic x86_64
UpgradeStatus: Upgraded to oneiric on 2011-08-14 (12 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare video
dmi.bios.date: 05/28/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0702
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M2N
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0702:bd05/28/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: charlie 2357 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xdbff8000 irq 22'
   Mixer name : 'Analog Devices AD1988'
   Components : 'HDA:11d41988,10438241,00100400'
   Controls : 36
   Simple ctrls : 21
DistroRelease: Ubuntu 11.10
HibernationDevice: RESUME=UUID=370b4504-ac8b-49f5-b54b-052fa5b01b25
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
IwConfig: Error: [Errno 2] No such file or directory
MachineType: System manufacturer System Product Name
Package: linux (not installed)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-9-generic root=UUID=1ab3c2d9-9b38-4502-9e2a-434ec6833169 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.0.0-9.12-generic 3.0.3
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-9-generic N/A
 linux-backports-modules-3.0.0-9-generic N/A
 linux-firmware 1.59
RfKill: Error: [Errno 2] No such file or directory
Tags: oneiric running-unity
UdevDb: Error: [Errno 2] No such file or directory
Uname: Linux 3.0.0-9-generic x86_64
UpgradeStatus: Upgraded to oneiric on 2011-08-14 (12 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare video
dmi.bios.date: 05/28/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0702
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M2N
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0702:bd05/28/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer