Date: Wed, 15 Feb 2006 10:10:17 -0800 (PST)
From: Christoph Lameter <clameter@engr.sgi.com>
To: Bharata B Rao <bharata@in.ibm.com>
cc: Christoph Lameter <clameter@engr.sgi.com>, Andi Kleen <ak@suse.de>,
       Ray Bryant <raybry@mpdtxmail.amd.com>, discuss@x86-64.org,
       linux-kernel@vger.kernel.org
Subject: Re: [discuss] mmap, mbind and write to mmap'ed memory crashes
 2.6.16-rc1[2] on 2 node X86_64
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On Wed, 15 Feb 2006, Bharata B Rao wrote:

> We don't initialize the free_area list for all zones. Instead,
> free_area_init_core() does that only for zones which are non-empty.

Right.

> But in __rmqueue(), we depend on these free_area lists to be intialized
> correctly for all zones, which is not true in the present case we
> are discussing.

> I think we either need to initialize free_area lists for all zones
> or check for !zone->free_area->nr_free in __rmqueue().

Or we can initialize all pcp to contain empty lists for zones without 
pages.

> Even with this, mbind still needs to be fixed. Even though it
> can't get a conforming zone in the node (MPOL_BIND case), right now,
> it goes ahead with the "bind"ing of the memory area. This causes the
> application to crash (assuming we have fixed the __rmqueue kernel crash)
> (Haven't yet figured our why exactly the application dies)

The application crashes because of an OOM.

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