linux-kernel - Re: [Bug #15672] KVM bug, git bisected

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Date:	Wed, 21 Apr 2010 08:20:15 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Rik van Riel <riel@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [Bug #15672] KVM bug, git bisected

From: "Rafael J. Wysocki" <rjw@...k.pl>
Date: Wed, Apr 21, 2010 at 07:02:02AM +0200

> On Wednesday 21 April 2010, Rik van Riel wrote:
> > On 04/20/2010 05:11 PM, Rik van Riel wrote:
> > > On 04/19/2010 11:19 PM, Rafael J. Wysocki wrote:
> > >> This message has been generated automatically as a part of a summary
> > >> report
> > >> of recent regressions.
> > >>
> > >> The following bug entry is on the current list of known regressions
> > >> from 2.6.33. Please verify if it still should be listed and let the
> > >> tracking team
> > >> know (either way).
> > >>
> > >>
> > >> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=15672
> > >> Subject : KVM bug, git bisected
> > >> Submitter : Kent Overstreet<kent.overstreet@...il.com>
> > >> Date : 2010-03-27 12:43 (24 days old)
> > >> First-Bad-Commit:
> > >> http://kernel.org/git/linus/5beb49305251e5669852ed541e8e2f2f7696c53e
> > >> Message-ID :<4BADFD74.8060904@...il.com>
> > >> References : http://marc.info/?l=linux-kernel&m=126969385121711&w=2
> > >
> > > Should be fixed by commit ea90002b0fa7bdee86ec22eba1d951f30bf043a6
> > 
> > Never mind me - this is a harmless (but loud) overflow
> > of PREEMPT_BITS in the preempt count.
> 
> OK, what am I supposed to do with this entry, then?  Close?

FWIW, I hit that warning too when chasing the anon_vma regression. It
seems on certain workloads (for me it was several kvm guests) we're
close to max preemption depth.

Anyway, adding some more people to Cc.

-- 
Regards/Gruss,
    Boris.
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