linux-kernel - Re: [BUG] 2.6.23-rc3-mm1 kernel BUG at mm/page

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Message-ID: <20070823130732.GC18456@skynet.ie>
Date:	Thu, 23 Aug 2007 14:07:32 +0100
From:	mel@...net.ie (Mel Gorman)
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Christoph Lameter <clameter@....com>, linux-mm@...ck.org
Subject: Re: [BUG] 2.6.23-rc3-mm1 kernel BUG at mm/page_alloc.c:2876!

On (22/08/07 13:50), Andrew Morton didst pronounce:
> On Wed, 22 Aug 2007 13:48:00 -0700
> Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > This:
> > 
> > --- a/mm/page_alloc.c~a
> > +++ a/mm/page_alloc.c
> > @@ -2814,6 +2814,8 @@ static int __cpuinit process_zones(int c
> >  	return 0;
> >  bad:
> >  	for_each_zone(dzone) {
> > +		if (!populated_zone(zone))
> > +			continue;		
> >  		if (dzone == zone)
> >  			break;
> >  		kfree(zone_pcp(dzone, cpu));
> > _
> > 
> > might help avoid the crash
> 
> err, make that
> 

We're already in the error path at this point and it's going to blow up.
The real problem is kmalloc_node() returning NULL for whatever reason.

> --- a/mm/page_alloc.c~a
> +++ a/mm/page_alloc.c
> @@ -2814,6 +2814,8 @@ static int __cpuinit process_zones(int c
>  	return 0;
>  bad:
>  	for_each_zone(dzone) {
> +		if (!populated_zone(dzone))
> +			continue;
>  		if (dzone == zone)
>  			break;
>  		kfree(zone_pcp(dzone, cpu));
> _
> 
> 

-- 
-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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