Comment 0 for bug 1055222

I disabled the autogroup scheduler on precise. I added a line to my rc.local to disable it on boot as follows:

echo 0 > /proc/sys/kernel/sched_autogroup_enabled

In linux-image-3.2.0-29, linux-image-3.2.0-30, and linux-image-3.2.0-31 this causes a kernel panic during the reboot or halt sequence.

I have been unable to store logs of the output but I always see a unable to dereference null pointer. The function reported in the stack trace tends to be update_cfs_shares, update_cfs_load and reweight_entity.

Here are some other details about my Ubuntu version:
lsb_release -rd
Description: Ubuntu 12.04.1 LTS
Release: 12.04

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-29-generic (not installed)
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
Uname: Linux 3.2.0-27-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: addo 2869 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfbbd8000 irq 58'
   Mixer name : 'Realtek ALC888'
   Components : 'HDA:10ec0888,15d9f380,00100202'
   Controls : 43
   Simple ctrls : 20
CurrentDmesg:
 Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
 dmesg: write failed: Broken pipe
Date: Mon Sep 24 10:30:50 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MachineType: Supermicro X8SAX
ProcEnviron:
 SHELL=/bin/bash
 TERM=xterm
 PATH=(custom, user)
 LANG=en_AU.UTF-8
 LANGUAGE=en_AU:en
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-27-generic root=UUID=fdd5524c-2bb2-4cce-8fbf-886c004c8640 ro
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:

dmi.bios.date: 09/17/10
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2.0
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: X8SAX
dmi.board.vendor: Supermicro
dmi.board.version: 2.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 1234567890
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2.0:bd09/17/10:svnSupermicro:pnX8SAX:pvr1234567890:rvnSupermicro:rnX8SAX:rvr2.0:cvnSupermicro:ct3:cvr1234567890:
dmi.product.name: X8SAX
dmi.product.version: 1234567890
dmi.sys.vendor: Supermicro