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

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Message-ID: <CA+1xoqfbxL-mL3XRDXxnuv0R6b9w6qxU7t+8U3FwS2eK5Sf0OA@mail.gmail.com>
Date:	Sun, 18 Nov 2012 09:59:47 -0500
From:	Sasha Levin <levinsasha928@...il.com>
To:	Rafael Aquini <aquini@...hat.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 4:54 PM, Rafael Aquini <aquini@...hat.com> wrote:
> 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.

Basically try running trinity (with ./trinity -m --quiet --dangerous
-l off) inside a disposable guest as root.

I manage to hit that every couple of hours.

Config attached.


Thanks,
Sasha

Confi

Download attachment "config-sasha" of type "application/octet-stream" (137165 bytes)