WARNING: at /build/buildd/linux-3.2.0/fs/proc/generic.c:586 proc_register+0xbf/0x170()

Often, but not always, my laptop will crash when unplugging the power cable.
https://launchpadlibrarian.net/107554591/BootDmesg.txt

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-25-generic 3.2.0-25.40
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic 3.2.18
Uname: Linux 3.2.0-25-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: marcel 1602 F.... xfce4-volumed
                      marcel 1630 F.... pulseaudio
CRDA:
 country ES:
  (2402 - 2482 @ 40), (N/A, 20)
  (5170 - 5250 @ 40), (N/A, 20)
  (5250 - 5330 @ 40), (N/A, 20), DFS
  (5490 - 5710 @ 40), (N/A, 27), DFS
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0x98200000 irq 46'
   Mixer name : 'Conexant CX20585'
   Components : 'HDA:14f15069,1028048b,00100302'
   Controls : 14
   Simple ctrls : 8
Date: Thu Jun 14 10:13:29 2012
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MachineType: Dell Inc. Inspiron 1090
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-25-generic root=UUID=586439A764398930 loop=/hostname/disks/root.disk ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-25-generic N/A
 linux-backports-modules-3.2.0-25-generic N/A
 linux-firmware 1.79
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/23/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: Inspiron 1090
dmi.board.vendor: Dell Inc.
dmi.board.version: A06
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A06
dmi.modalias: dmi:bvnDellInc.:bvrA06:bd08/23/2011:svnDellInc.:pnInspiron1090:pvrA06:rvnDellInc.:rnInspiron1090:rvrA06:cvnDellInc.:ct8:cvrA06:
dmi.product.name: Inspiron 1090
dmi.product.version: A06
dmi.sys.vendor: Dell Inc.
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
ApportVersion: 2.3-0ubuntu1
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: xubuntu 3329 F.... pulseaudio
                      xubuntu 3332 F.... xfce4-volumed
CRDA:
 country ES:
  (2402 - 2482 @ 40), (N/A, 20)
  (5170 - 5250 @ 40), (N/A, 20)
  (5250 - 5330 @ 40), (N/A, 20), DFS
  (5490 - 5710 @ 40), (N/A, 27), DFS
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0x98200000 irq 46'
   Mixer name : 'Conexant CX20585'
   Components : 'HDA:14f15069,1028048b,00100302'
   Controls : 14
   Simple ctrls : 8
CasperVersion: 1.319
DistroRelease: Ubuntu 12.10
LiveMediaBuild: Xubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120709)
MachineType: Dell Inc. Inspiron 1090
Package: linux (not installed)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: initrd=/casper/initrd.lz file=/cdrom/preseed/username.seed boot=casper quiet splash -- BOOT_IMAGE=/casper/vmlinuz
ProcVersionSignature: Ubuntu 3.5.0-3.3-generic 3.5.0-rc5
RelatedPackageVersions:
 linux-restricted-modules-3.5.0-3-generic N/A
 linux-backports-modules-3.5.0-3-generic N/A
 linux-firmware 1.82
Tags: quantal
Uname: Linux 3.5.0-3-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 08/23/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: Inspiron 1090
dmi.board.vendor: Dell Inc.
dmi.board.version: A06
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A06
dmi.modalias: dmi:bvnDellInc.:bvrA06:bd08/23/2011:svnDellInc.:pnInspiron1090:pvrA06:rvnDellInc.:rnInspiron1090:rvrA06:cvnDellInc.:ct8:cvrA06:
dmi.product.name: Inspiron 1090
dmi.product.version: A06
dmi.sys.vendor: Dell Inc.