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

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

> On Tue, Apr 19, 2011 at 6:46 PM, James Bottomley
> <James.Bottomley@...senpartnership.com> wrote:
> > It compiles OK, but crashes on boot in fsck.  The 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?