From: Holger Kiehl <Holger.Kiehl@dwd.de>
To: David Rientjes <rientjes@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@suse.cz>,
linux-kernel <linux-kernel@vger.kernel.org>,
Mel Gorman <mgorman@suse.de>,
linux-mm@kvack.org
Subject: Re: Need help in bug in isolate_migratepages_range
Date: Tue, 4 Feb 2014 07:17:18 +0000 (GMT) [thread overview]
Message-ID: <alpine.LRH.2.02.1402040713220.13901@diagnostix.dwd.de> (raw)
In-Reply-To: <alpine.DEB.2.02.1402031602060.10778@chino.kir.corp.google.com>
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
next prev parent reply other threads:[~2014-02-04 7:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-31 21:12 Holger Kiehl
2014-02-03 12:20 ` Michal Hocko
2014-02-03 14:29 ` Holger Kiehl
2014-02-03 16:20 ` Michal Hocko
2014-02-03 16:52 ` Vlastimil Babka
2014-02-04 0:06 ` David Rientjes
2014-02-04 7:17 ` Holger Kiehl [this message]
2014-02-05 0:02 ` [patch] mm, page_alloc: make first_page visible before PageTail David Rientjes
2014-02-05 0:06 ` Andrew Morton
2014-02-05 0:14 ` David Rientjes
2014-02-05 0:22 ` [patch v2] " David Rientjes
2014-02-05 8:42 ` Michal Hocko
2014-02-12 9:00 ` [patch -mm] mm: close PageTail race David Rientjes
2014-02-03 19:50 ` Need help in bug in isolate_migratepages_range Holger Kiehl
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