linux-kernel - Re: Need help in bug in isolate_migratepages

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Date:	Tue, 4 Feb 2014 07:17:18 +0000 (GMT)
From:	Holger Kiehl <Holger.Kiehl@....de>
To:	David Rientjes <rientjes@...gle.com>
cc:	Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...e.cz>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org
Subject: Re: Need help in bug in isolate_migratepages_range

On Mon, 3 Feb 2014, David Rientjes wrote:

> On Mon, 3 Feb 2014, Vlastimil Babka wrote:
>
>> It seems to come from balloon_page_movable() and its test page_count(page) ==
>> 1.
>>
>
> Hmm, I think it might be because compound_head() == NULL here.  Holger,
> this looks like a race condition when allocating a compound page, did you
> only see it once or is it actually reproducible?
>
No, this only happened once. It is not reproducable, the system was running
for four days without problems. And before this kernel, five years without
any problems.

Thanks,
Holger
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