Kernel Oops - BUG: unable to handle kernel NULL pointer dereference at 00000140; EIP is at ext4_evict_inode+0x32/0x400

[Ben Prescott]

booted off the 12.04 beta 2 iso
system is a KVM virtual machine, hosted on my 11.04 desktop

ProblemType: KernelOops
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-20-generic-pae
Uname: Linux 3.2.0-20-generic-pae i686
Annotation: Your system might become unstable now and might need to be restarted.
Architecture: i386
Date: Sun Apr 22 15:50:14 2012
Failure: oops
SourcePackage: linux
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.95-0ubuntu1
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ubuntu 2923 F.... pulseaudio
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
CasperVersion: 1.312
DistroRelease: Ubuntu 12.04
IwConfig:
 lo no wireless extensions.

 eth0 no wireless extensions.
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120328)
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Bochs Bochs
Package: linux (not installed)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB:

ProcKernelCmdLine: file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- keyboard-configuration/layoutcode=gb
ProcVersionSignature: Ubuntu 3.2.0-20.33-generic-pae 3.2.12
RfKill:

StagingDrivers: zram
Tags: precise staging
Uname: Linux 3.2.0-20-generic-pae i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 01/01/2007
dmi.bios.vendor: Bochs
dmi.bios.version: Bochs
dmi.chassis.type: 1
dmi.chassis.vendor: Bochs
dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2007:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
dmi.product.name: Bochs
dmi.sys.vendor: Bochs

[Ben Prescott (ben.prescott)]

remarkable co-incidence.
see dmesg output on one of my other bugs; Bug #986558 - same oops occured there.
in both cases, I've installed 11.10 systems with the goal of reproducing Bug #986558
ext4 is the FS I chose to use on the previous build, and it would seem the oops occurs while ubiquity is checking out the existing installation.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 986905

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Ben Prescott (ben.prescott)]

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[Brad Figg (brad-figg)]

Thank you for taking the time to file a bug report on this issue.

However, given the number of bugs that the Kernel Team receives during any development cycle it is impossible for us to review them all. Therefore, we occasionally resort to using automated bots to request further testing. This is such a request.

We have noted that there is a newer version of the development kernel than the one you last tested when this issue was found. Please test again with the newer kernel and indicate in the bug if this issue still exists or not.

You can update to the latest development kernel by simply running the following commands in a terminal window:

    sudo apt-get update
    sudo apt-get dist-upgrade

If the bug still exists, change the bug status from Incomplete to Confirmed. If the bug no longer exists, change the bug status from Incomplete to Fix Released.

If you want this bot to quit automatically requesting kernel tests, add a tag named: bot-stop-nagging.

 Thank you for your help, we really do appreciate it.