[Bug 619248] [NEW] BUG: unable to handle kernel NULL pointer dereference at 0000000000000840

[Luka Renko]

Public bug reported:

Kubuntu Maverick, up-to-date

I was running my laptop on battery and my screen just got black with
text cursor (like that X server died). Could not switch consoles or
reboot - only hard reset helped. After reboot I have noticed linux-image
crash in /var/crash - have used that one to report this bug.

In Xorg.0.log.old, I have noticed these messages at the end of log:

[ 55395.821] (II) intel(0): EDID vendor "LEN", prod id 16404
[ 55395.821] (II) intel(0): Printing DDC gathered Modelines:
[ 55395.821] (II) intel(0): Modeline "1440x900"x0.0   74.08  1440 1464 1480 1600  900 903 909 926 -hsync -vsync (46.3 kHz)
[ 55399.841] (II) PM Event received: Capability Changed
[ 55399.841] I830PMEvent: Capability change


Also note, that I have two other (potentially related) bug reports with X server hangs:
- bug 617567
- bug 618696

ProblemType: KernelOops
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-15-generic
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.35-15.21-generic 2.6.35.1
Uname: Linux 2.6.35-15-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
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:  lukar      2318 F.... knotify4
                      lukar      2438 F.... kmix
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf2620000 irq 46'
   Mixer name	: 'Conexant CX20561 (Hermosa)'
   Components	: 'HDA:14f15051,17aa20ff,00100000'
   Controls      : 15
   Simple ctrls  : 8
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7XHT24WW-1.06'
   Mixer name	: 'ThinkPad EC 7XHT24WW-1.06'
   Components	: ''
   Controls      : 1
   Simple ctrls  : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [off]
Date: Tue Aug 17 10:24:44 2010
Failure: oops
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=ca5cbfb8-430e-411a-8740-2a3e6cba10bd
InstallationMedia: Kubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
MachineType: LENOVO 74705HG
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-15-generic root=/dev/mapper/plain-root ro quiet splash
RelatedPackageVersions: linux-firmware 1.38
SourcePackage: linux
Title: BUG: unable to handle kernel NULL pointer dereference at 0000000000000840
dmi.bios.date: 03/10/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 6DET63WW (3.13 )
dmi.board.name: 74705HG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6DET63WW(3.13):bd03/10/2010:svnLENOVO:pn74705HG:pvrThinkPadX200s:rvnLENOVO:rn74705HG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 74705HG
dmi.product.version: ThinkPad X200s
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-kerneloops kernel-oops

-- 
BUG: unable to handle kernel NULL pointer dereference at 0000000000000840
https://bugs.launchpad.net/bugs/619248
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