linux-kernel - Re: Re: Re: Re: [PATCH 2/2] mm, oom: fix potential data corruption when oom

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Message-ID: <20170817135810.GB17786@dhcp22.suse.cz>
Date:   Thu, 17 Aug 2017 15:58:10 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     akpm@...ux-foundation.org, andrea@...nel.org, kirill@...temov.name,
        oleg@...hat.com, wenwei.tww@...baba-inc.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: Re: Re: Re: [PATCH 2/2] mm, oom: fix potential data corruption
 when oom_reaper races with writer

On Tue 15-08-17 21:58:29, Tetsuo Handa wrote:
[...]
> If I apply this patch, I can no longer reproduce this problem even with btrfs.
> 
> -+ * and could cause a memory corruption (zero pages instead of the
> -+ * original content).
> ++ * and could cause a memory corruption (random content instead of the
> ++ * original content).

If anything then I would word it this way

and could cause a memory corruption (zero pages for refaults but even a
random content has been observed but never explained properly)

> Tested-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>

Thanks
-- 
Michal Hocko
SUSE Labs