linux-kernel - Re: inconsistent lock state message on 2.6.36.4 stable release

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Message-ID: <20110302210338.GF14162@csn.ul.ie>
Date:	Wed, 2 Mar 2011 21:03:39 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Greg KH <gregkh@...e.de>
Cc:	"Nadolski, Edmund" <edmund.nadolski@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Williams, Dan J" <dan.j.williams@...el.com>
Subject: Re: inconsistent lock state message on 2.6.36.4 stable release

On Wed, Mar 02, 2011 at 03:25:15PM -0500, Greg KH wrote:
> On Wed, Mar 02, 2011 at 01:19:48PM -0700, Nadolski, Edmund wrote:
> > With v2.6.36.4 stable release and CONFIG_PROVE_LOCKING set, I notice
> > the below message during boot (full dmesg attached):
> 
> 2.6.36 is now "end of life" so there's really no need to test, debug, or
> report problems here as there's nothing we can do about it.
> 
> > Per git bisect, it seems to have originated with this commit:
> > 
> > $ git bisect good
> > c04eb9683fbb6374275309b859fcbf02e1db2c78 is the first bad commit
> > commit c04eb9683fbb6374275309b859fcbf02e1db2c78
> > Author: Mel Gorman <mel@....ul.ie>
> > Date:   Thu Jan 13 15:45:41 2011 -0800
> > 
> >     mm: page allocator: adjust the per-cpu counter threshold when memory is low
> > 
> >     commit 88f5acf88ae6a9778f6d25d0d5d7ec2d57764a97 upstream.
> > 
> > The message goes away after I do a git revert on this commit. I've
> > also seen this message on 2.6.37.2, but not on 2.6.38-rc7.
> 
> Care to figure out what commit fixed this so that we can backport it to
> the .37-stable kernel?
> 
> git bisect can be used to do this as well.
> 

It looks like the call to get_online_cpus() that is causing the problem. If
so, I believe it to be fixed by the commit [b44129b3: mm: vmstat: use a
single setter function and callback for adjusting percpu thresholds].
Edmund, care to test with that patch applied?

Thanks.

-- 
Mel Gorman
SUSE Labs
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