That definately fixed it.  MTBF was about 20 days on those systems, since that patch we've had 200 server days with no problems.

Thanks!

On Tue, 12 Jul 2011, Minchan Kim wrote:

Date: Tue, 12 Jul 2011 09:16:09 +0900
From: Minchan Kim <redacted>
To: Chris Pearson <redacted>
Cc: linux-mm@kvack.org, Andrea Arcangeli <redacted>,
   Andrew Morton [off-list ref], stable [off-list ref]
Subject: Re: NULL poniter dereference in isolate_lru_pages 2.6.39.1

On Tue, Jul 12, 2011 at 5:52 AM, Chris Pearson
[off-list ref] wrote:

quoted

We applied the patch to many servers.  No problems so far.

The .config is attached.

Thanks. I verified. The point where isolate_lru_pages + 0x225 is
page_count exactly. So Andrea patch solves this problem apparently.
Couldn't we throw this patch to stable tree?

https://patchwork.kernel.org/patch/857442/

quoted

What's the config option to get that debugging info in the future?

CONFIG_DEBUG_INFO helps you. :)

-- 
Kind regards,
Minchan Kim

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