linux-kernel - Re: [PATCH v3] mm: make expand_downwards symmetrical to expand

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Date:	Tue, 19 Apr 2011 12:15:01 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	Pekka Enberg <penberg@...nel.org>, Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org, David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
 expand_upwards

On Tue, 19 Apr 2011, James Bottomley wrote:

> On Tue, 2011-04-19 at 20:05 +0300, Pekka Enberg wrote:
> > > It seems to be a random intermittent mm crash because the next reboot
> > > crashed with the same trace but after the fsck had completed and the
> > > third came up to the login prompt.
> >
> > Looks like a genuine SLUB problem on parisc. Christoph?
>
> Looking through the slub code, it seems to be making invalid
> assumptions.  All of the node stuff is dependent on CONFIG_NUMA.
> However, we're CONFIG_DISCONTIGMEM (with CONFIG_NUMA not set): on the
> machines I and Dave Anglin have, our physical memory ranges are 0-1GB
> and 64-65GB, so I think slub crashes when we get a page from the high
> memory range ... because it's not expecting a non-zero node number.

Right !NUMA systems only have node 0.
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