kernel-packages team mailing list archive

[troy engel <troyengel@xxxxxxxxx>]

** Attachment added: "screencap of crash, 2/2"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1422016/+attachment/4325064/+files/p2147.png

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1422016

Title:
  Kernel panic during system boot with sched_autogroup_enabled = 0

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  # lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  # uname -a
  Linux napa 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

  A kernel panic occurs while disabling the automatic task group
  creation within /etc/sysctl.conf using "kernel.sched_autogroup_enabled
  = 0".

  After adding the "noautogroup" kernel parameter to GRUB, the system
  will boot without issue.

  I have attached a screen shot of the stack trace as I was unable to
  capture the stack trace using netconsole, linux-crashdump, and
  /var/log/kern.log. Oddly enough, while trying one last approach
  (serial console) to capture the full trace within virtual box using a
  host pipe and setting console=ttyS0, the system booted without issue
  and disabled automatic task group creation.

  According to
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1055222, a fix
  for the issue has hit the Precise kernel and should be released in
  3.2.0-36.

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