[Bug 605440] Re: BUG: unable to handle kernel NULL pointer dereference at 00000008

Geir Ove Myhr 605440 at bugs.launchpad.net
Fri Jul 16 07:21:07 UTC 2010


I thought 2.6.35-6.8 and other -rc3 based kernels were safe, but now I
got a oops from -6.8 too. dmesg is attached. Unlike with 2.6.35-7, xorg
works fine after this one, and I wouldn't have noticed it if I were not
checking dmesg output or see the apport crash indicator.

** Attachment added: "dmesg-2.6.35-6.txt"
   http://launchpadlibrarian.net/52019485/dmesg-2.6.35-6.txt

** Description changed:

  This bug may be the underlying problem of bug 605124, which I have
  reported upstream as https://bugs.freedesktop.org/show_bug.cgi?id=29048
  . I had written some more relevant information here, but I was struck by
  bug 553946 for the second time today, and can't remember what it was :-(
  
  I have tried several kernels, but it is hard to say anything for sure,
  since the frequency of this problem varies with kernel build and
  possibly the mood of ureadahead (i.e. how fast it is able to make the
  boot go).
  
  2.6.35-7: Where I initially had the problem. Sometimes I only get this oops message in the dmesg output and everything else works fine, but often I get an the oops from bug 605124 and Xorg starts in low-graphics mode.
- 2.6.35-6: I have booted this 3-4 times and haven't had any problems yet.
+ 2.6.35-6: I have had this oops once now with this kernel. See comment #2.
  2.6.35-rc5 (mainline build): I get this oops every now and then, but it does not affect Xorg or anything else as far as I can see.
  2.6.35-rc4 (mainline build): I get this oops every now and then, but it does not affect Xorg or anything else as far as I can see. The laptop keyboard and pointer does not work with this build, but USB mouse and keyboard does.
  2.6.35-rc3 (mainline build): I have tried to trigger the problem here several times without success. ureadahead sayd it would reprofile on next boot when I installed this, but it always returned exit status 5 on boot with this kernel, which may mean the boots were slower.
  2010-06-15 mainline build:  I have tried to trigger the problem here several times without success, but I alternated with -rc5 for comparison and in 8 boots on each, none of them had problems.
  2010-06-30 mainline build: Like -rc4, laptop keyboard doesn't work and at this time I didn't have an external keyboard available.
  
  ProblemType: KernelOops
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-7-generic 2.6.35-7.12
  Regression: Yes
  Reproducible: No
  ProcVersionSignature: Ubuntu 2.6.35-7.12-generic 2.6.35-rc4
  Uname: Linux 2.6.35-7-generic i686
  AcpiTables: Error: [Errno 13] Permission denied
  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
  ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
-    Subdevices: 2/2
-    Subdevice #0: subdevice #0
-    Subdevice #1: subdevice #1
+  **** List of CAPTURE Hardware Devices ****
+  card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
+    Subdevices: 2/2
+    Subdevice #0: subdevice #0
+    Subdevice #1: subdevice #1
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  gom        1456 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  gom        1456 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
-  Card hw:0 'Intel'/'HDA Intel at 0xf8220000 irq 46'
-    Mixer name	: 'Analog Devices AD1984'
-    Components	: 'HDA:11d41984,17aa20dd,00100400'
-    Controls      : 31
-    Simple ctrls  : 19
+  Card hw:0 'Intel'/'HDA Intel at 0xf8220000 irq 46'
+    Mixer name	: 'Analog Devices AD1984'
+    Components	: 'HDA:11d41984,17aa20dd,00100400'
+    Controls      : 31
+    Simple ctrls  : 19
  Card29.Amixer.info:
-  Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7RHT16WW-1.02'
-    Mixer name	: 'ThinkPad EC 7RHT16WW-1.02'
-    Components	: ''
-    Controls      : 1
-    Simple ctrls  : 1
+  Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 7RHT16WW-1.02'
+    Mixer name	: 'ThinkPad EC 7RHT16WW-1.02'
+    Components	: ''
+    Controls      : 1
+    Simple ctrls  : 1
  Card29.Amixer.values:
-  Simple mixer control 'Console',0
-    Capabilities: pswitch pswitch-joined penum
-    Playback channels: Mono
-    Mono: Playback [on]
+  Simple mixer control 'Console',0
+    Capabilities: pswitch pswitch-joined penum
+    Playback channels: Mono
+    Mono: Playback [on]
  Date: Wed Jul 14 15:45:18 2010
  Failure: oops
  Frequency: Once a day.
  HibernationDevice: RESUME=UUID=e938f4f3-2a95-49cf-96c1-b8bda2c16dce
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha i386 (20100630.2)
  MachineType: LENOVO 7764CTO
  PccardctlIdent:
-  Socket 0:
-    no product info available
+  Socket 0:
+    no product info available
  PccardctlStatus:
-  Socket 0:
-    no card
+  Socket 0:
+    no card
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-7-generic root=UUID=460f28a3-969c-409a-ab57-6070e2c7288e ro quiet splash
  RelatedPackageVersions: linux-firmware 1.37
  RfKill:
-  0: phy0: Wireless LAN
-  	Soft blocked: no
-  	Hard blocked: no
+  0: phy0: Wireless LAN
+   Soft blocked: no
+   Hard blocked: no
  SourcePackage: linux
  Title: BUG: unable to handle kernel NULL pointer dereference at 00000008
  dmi.bios.date: 11/27/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7SET36WW (1.22 )
  dmi.board.name: 7764CTO
  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:bvr7SET36WW(1.22):bd11/27/2008:svnLENOVO:pn7764CTO:pvrThinkPadX61Tablet:rvnLENOVO:rn7764CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 7764CTO
  dmi.product.version: ThinkPad X61 Tablet
  dmi.sys.vendor: LENOVO

-- 
BUG: unable to handle kernel NULL pointer dereference at 00000008
https://bugs.launchpad.net/bugs/605440
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