Kernel Oops - unable to handle kernel NULL pointer dereference; EIP is at free_thread_info+0xb/0x30
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Medium
|
Unassigned |
Bug Description
Since upgrading from 10.04 to 12.04, my server suffers from frequent freezes. I have been unable to find a pattern and the freeze 'behaviour' is not always the same: usually the system does not respond at all anymore, and sometimes an error message is printed to the console:
BUG: unable to handle kernel NULL pointer dereference at (null)
free_thread_
The attached kern.log file has the full error messages.
Usually the system can reboot using Alt+SysReq+B, but sometimes that doesn't even work. And on rare occasions the keyboard lights start blinking.
Now, there might be more than 1 problem at hand here, but at least I've got an error message now.
PS: on 10.04 I also had occasional freezes, but that averaged once every 3 months or so. Now it happens once every three days.
---
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Card0.Amixer.info:
Card hw:0 'SB'/'HDA ATI SB at 0xfe8f4000 irq 16'
Mixer name : 'Realtek ALC889'
Components : 'HDA:10ec0889,
Controls : 46
Simple ctrls : 22
DistroRelease: Ubuntu 12.04
HibernationDevice: RESUME=
IwConfig:
lo no wireless extensions.
eth0 no wireless extensions.
MachineType: MICRO-STAR INTERNATIONAL CO.,LTD MS-7596
MarkForUpload: True
Package: linux (not installed)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=
ProcVersionSign
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageV
linux-
linux-
linux-firmware 1.79.11
RfKill:
Tags: precise
Uname: Linux 3.2.0-60-generic i686
UpgradeStatus: Upgraded to precise on 2014-01-12 (90 days ago)
UserGroups:
dmi.bios.date: 04/23/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V2.6
dmi.board.
dmi.board.name: 785GM-E51 (MS-7596)
dmi.board.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
dmi.board.version: 1.0
dmi.chassis.
dmi.chassis.type: 3
dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
dmi.product.name: MS-7596
dmi.product.
dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1306955
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.