Date: Tue, 19 Apr 2011 12:15:01 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
cc: Pekka Enberg <penberg@kernel.org>, Michal Hocko <mhocko@suse.cz>,
        Andrew Morton <akpm@linux-foundation.org>,
        Hugh Dickins <hughd@google.com>, linux-mm@kvack.org,
        LKML <linux-kernel@vger.kernel.org>, linux-parisc@vger.kernel.org,
        David Rientjes <rientjes@google.com>
Subject: Re: [PATCH v3] mm: make expand_downwards symmetrical to
 expand_upwards
In-Reply-To: <1303233088.3171.26.camel@mulgrave.site>
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References: <20110415135144.GE8828@tiehlicka.suse.cz>  <alpine.LSU.2.00.1104171952040.22679@sister.anvils>  <20110418100131.GD8925@tiehlicka.suse.cz>  <20110418135637.5baac204.akpm@linux-foundation.org>  <20110419111004.GE21689@tiehlicka.suse.cz> 
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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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