linux-kernel - Re: [PATCH 1/2] mm, oom: introduce oom reaper

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Message-ID: <20151225114428.GC6754@dhcp22.suse.cz>
Date:	Fri, 25 Dec 2015 12:44:29 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Ross Zwisler <zwisler@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	David Rientjes <rientjes@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Argangeli <andrea@...nel.org>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [PATCH 1/2] mm, oom: introduce oom reaper

On Fri 25-12-15 12:35:37, Michal Hocko wrote:
[...]
> Thanks I will try to reproduce early next year. But so far I think this
> is just a general issue of MADV_DONTNEED vs. truncate and oom_reaper is
> just lucky to trigger it. There shouldn't be anything oom_reaper
> specific here. Maybe there is some additional locking missing?

Hmm, scratch that. I think Tetsuo has nailed it. It seems like
the missing initialization of details structure during unmap
is the culprit. So there most probably was on OOM killing
invoked. It is just a side effect of the patch and missing
http://marc.info/?l=linux-mm&m=145068666428057 follow up fix.
-- 
Michal Hocko
SUSE Labs
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