Ubuntu
linux package

2.6.32-49 kernel hangs during reboot under XenServer 6.0 PV guest

Bug #1199987 reported by Michael S. Fischer
18
This bug affects 3 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Confirmed
Medium
Unassigned

Bug Description

Kernel 2.6.32-49 hangs at reboot (though not halt) when run under a Xen PV guest. Our hypervisor is XenServer 6.0 with all the latest patches.

If we revert to 2.6.32-48, the problem goes away and reboots are successful.

This suggests a regression introduced in -49, possibly this patch (though I am not certain):

  * kernel/sys.c: call disable_nonboot_cpus() in kernel_restart()
    - LP: #1193044

See original description
Michael S. Fischer (otterley)
affects: linux (Ubuntu) → linux-meta (Ubuntu)
affects: linux-meta (Ubuntu) → linux (Ubuntu)
Michael S. Fischer (otterley)
description: updated
Revision history for this message
Brad Figg (brad-figg) wrote : Missing required logs.

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

apport-collect 1199987

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.

Changed in linux (Ubuntu):
status: New → Incomplete
Revision history for this message
Michael S. Fischer (otterley) wrote : Re: 2.6.32-49 kernel hangs during reboot under Xen PV guest

I'm unable to run apport as it's a kernel hang issue.

Changed in linux (Ubuntu):
status: Incomplete → Confirmed
Joseph Salisbury (jsalisbury)
Changed in linux (Ubuntu):
importance: Undecided → Medium
tags: added: lucid regression-update
Revision history for this message
Michael S. Fischer (otterley) wrote :

This appears not to be an issue with XenServer 6.1.

Citrix case ID is 61077165.

summary: - 2.6.32-49 kernel hangs during reboot under Xen PV guest
+ 2.6.32-49 kernel hangs during reboot under XenServer 6.0 PV guest
Revision history for this message
Nathan Stratton Treadway (nathanst) wrote :

We're also seeing this hang-on-reboot problem when running linux-image-2.6.32-53-server and linux-image-2.6.32-50-server kernels in a Xen guest... but in our case our Xen hypervisor is v4.0.

For what it's worth, I found this related discussion thread:
http://discussions.citrix.com/topic/332737-ubuntu-1004-on-xenserver-602-hangs-on-reboot-100-cpu/

Revision history for this message
Nathan Stratton Treadway (nathanst) wrote :

Additional note: Precise guests on the same Xen host don't have problems rebooting, e.g. using the latest linux-image-3.5.0-43-generic kernel.

Revision history for this message
#1 (cjc) wrote :

We're also seeing the same symptoms under Xen version: 3.4.2 (preserve-AD) with the following guest kernels.

Linux web1 2.6.32-50-server #112-Ubuntu SMP Tue Jul 9 20:45:08 UTC 2013 x86_64 GNU/Linux
Linux web2 2.6.32-67-server #134-Ubuntu SMP Wed Sep 24 18:55:00 UTC 2014 x86_64 GNU/Linux

Due to the nature of the issue, we're unable to run apport-collect.

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