linux-kernel - Re: PROBLEM: kernel BUG at mm/page

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Message-Id: <201001210110.18569.mb@emeraldcity.de>
Date:	Thu, 21 Jan 2010 01:10:07 +0100
From:	Michail Bachmann <mb@...raldcity.de>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Christoph Lameter <cl@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: kernel BUG at mm/page_alloc.c:775

> On Tue, Jan 12, 2010 at 03:25:23PM -0600, Christoph Lameter wrote:
> > On Sat, 9 Jan 2010, Michail Bachmann wrote:
> > > [   48.505381] kernel BUG at mm/page_alloc.c:775!
> >
> > Somehow nodes got mixed up or the lookup tables for pages / zones are not
> > giving the right node numbers.
> 
> Agreed. On this type of machine, I'm not sure how that could happen
> short of struct page information being corrupted. The range should
> always be aligned to a pageblock boundary and I cannot see how that
> would cross a zone boundary on this machine.
> 
> Does this machine pass memtest?
I ran one pass with memtest86 without errors before posting this bug, but I 
can let it run "all tests" for a while just to be sure it is not caused by 
broken hw.

> Is there any chance the problem can be bisected?
I will give it a try, when the memtest is done.

Thanks.

CU Micha

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