From: Michail Bachmann <mb@emeraldcity.de>
To: Mel Gorman <mel@csn.ul.ie>
Subject: Re: PROBLEM: kernel BUG at mm/page_alloc.c:775
Date: Thu, 21 Jan 2010 01:10:07 +0100
User-Agent: KMail/1.12.4 (Linux/2.6.32-trunk-686; KDE/4.3.4; i686; ; )
Cc: Christoph Lameter <cl@linux-foundation.org>, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org
References: <201001092232.21841.mb@emeraldcity.de> <alpine.DEB.2.00.1001121524140.25925@router.home> <20100118120315.GD7499@csn.ul.ie>
In-Reply-To: <20100118120315.GD7499@csn.ul.ie>
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> 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 n=
ot
> > giving the right node numbers.
>=20
> 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.
>=20
> Does this machine pass memtest?
I ran one pass with memtest86 without errors before posting this bug, but I=
=20
can let it run "all tests" for a while just to be sure it is not caused by=
=20
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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