linux-kernel - Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of RAM that should be free

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Message-ID: <66f5d234-d221-fa3c-7abe-71fc4f5259ec@I-love.SAKURA.ne.jp>
Date:   Wed, 30 Nov 2016 22:58:19 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Marc MERLIN <marc@...lins.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of
 RAM that should be free

On 2016/11/30 8:01, Marc MERLIN wrote:
> And, after 5H of copying, not a single hang, or USB disconnect, or anything.
> Obviously this seems to point to other problems in the code, and I have no
> idea which layer is a culprit here, but reducing the buffers absolutely
> helped a lot.

Maybe you can try commit 63f53dea0c9866e9 ("mm: warn about allocations which stall for too long")
or http://lkml.kernel.org/r/1478416501-10104-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp
for finding the culprit.