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Re: [Xen-devel] [PATCH] BUG() on soft lockup upon suspend/resume

  • To: Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Tue, 10 Oct 2006 11:06:56 +0100
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 10 Oct 2006 03:07:27 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcbsU9EHD3fCf1hHEduIfgAX8io7RQ==
  • Thread-topic: [Xen-devel] [PATCH] BUG() on soft lockup upon suspend/resume

On 10/10/06 01:29, "Glauber de Oliveira Costa" <gcosta@xxxxxxxxxx> wrote:

> BUG: soft lockup detected on CPU#1!
> Call Trace:

The trace indicates the CPU is idling, so certainly this is a bogus
softlockup warning. I guess we already knew that. ;-)

> It obviously never happen on CPU#0, but I see it on all others (vcpus=4)

Probably worth instrumenting the warning message to print jiffies and
timestamp. Also the timestamp values for all other CPUs and see how much
they vary. We want to find out if one CPU is cimply lagging in touching the
softlockup watchdog, or if perhaps jiffies is updating in big jumps.

Given that this is so repro'able for you, it's weird noone else has reported

 -- Keir

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