kernel-packages team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.19 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.19-vivid/

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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

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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:
  Incomplete

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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