linux-kernel - Re: mmotm-2013-05-22: Bad page state

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Date:	Wed, 29 May 2013 10:15:30 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Dave Hansen <dave@...1.net>
Cc:	LKML <linux-kernel@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Shaohua Li <shli@...nel.org>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Minchan Kim <minchan@...nel.org>
Subject: Re: mmotm-2013-05-22: Bad page state

On Tue, May 28, 2013 at 02:51:21PM -0700, Dave Hansen wrote:
> I was rebasing my mapping->radix_tree lock batching patches on top of
> Mel's stuff.  It looks like something is jumping the gun and freeing a
> page before it has been written out.  Somebody probably did an extra
> put_page() or something.
> 
> I'm running 3.10.0-rc2-mm1-00322-g8d4c612 from
> 
> 	git://git.cmpxchg.org/linux-mmotm.git
> 
> This is pretty reproducible.  I'll go try and test plain 3.10-rc2 next
> to make sure it's not coming from Linus's stuff.
> 

Patch 1 from the follow-up series "mm: vmscan: Block kswapd if it is
encountering pages under writeback -fix"

The rest of that follow-up series needs further work and I'm still
working on it but patch 1 is what fixes this particular problem.
Changelog says why.

-- 
Mel Gorman
SUSE Labs
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