Date: Tue, 19 Apr 2011 12:12:48 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
To: Pekka Enberg <penberg@kernel.org>
cc: James Bottomley <James.Bottomley@hansenpartnership.com>,
        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
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On Tue, 19 Apr 2011, Pekka Enberg wrote:

> On Tue, Apr 19, 2011 at 6:46 PM, James Bottomley
> <James.Bottomley@hansenpartnership.com> wrote:
> > It compiles OK, but crashes on boot in fsck. =A0The crash is definitely=
 mm
> > but looks to be a slab problem (it's a null deref on a spinlock in
> > add_partial(), which seems unrelated to this patch).

That means that the per node structures have not been setup yet. Node
hotplug not working?

> > 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?

Race between node hotplug and use of the slab on that node?

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