linux-kernel - Re: [PATCH v12 4/7] mm: introduce compaction and migration for ballooned pages

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Message-ID: <20121117215434.GA23879@x61.redhat.com>
Date:	Sat, 17 Nov 2012 19:54:35 -0200
From:	Rafael Aquini <aquini@...hat.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Minchan Kim <minchan@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH v12 4/7] mm: introduce compaction and migration for
 ballooned pages

On Sat, Nov 17, 2012 at 01:01:30PM -0500, Sasha Levin wrote:
> 
> I'm getting the following while fuzzing using trinity inside a KVM tools guest,
> on latest -next:
> 
> [ 1642.783728] BUG: unable to handle kernel NULL pointer dereference at 0000000000000194
> [ 1642.785083] IP: [<ffffffff8122b354>] isolate_migratepages_range+0x344/0x7b0
> 
> My guess is that we see those because of a race during the check in
> isolate_migratepages_range().
> 
> 
> Thanks,
> Sasha

Sasha, could you share your .config and steps you did used with trinity? So I
can attempt to reproduce this issue you reported.

Thanks, 
Rafael
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