linux-kernel - RE: [PATCH] Fix race between oom kill and task exit

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Message-ID: <3917C05D9F83184EAA45CE249FF1B1DD025310D2@SHSMSX103.ccr.corp.intel.com>
Date:	Fri, 29 Nov 2013 02:06:25 +0000
From:	"Ma, Xindong" <xindong.ma@...el.com>
To:	Oleg Nesterov <oleg@...hat.com>, Michal Hocko <mhocko@...e.cz>
CC:	William Dauchy <wdauchy@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"Tu, Xiaobing" <xiaobing.tu@...el.com>, azurIt <azurit@...ox.sk>,
	Sameer Nanda <snanda@...omium.org>
Subject: RE: [PATCH] Fix race between oom kill and task exit

> From: Oleg Nesterov [mailto:oleg@...hat.com]
> Sent: Friday, November 29, 2013 2:39 AM
> To: Michal Hocko
> Cc: William Dauchy; Johannes Weiner; Ma, Xindong;
> akpm@...ux-foundation.org; rientjes@...gle.com; rusty@...tcorp.com.au;
> linux-mm@...ck.org; linux-kernel@...r.kernel.org; Peter Zijlstra;
> gregkh@...uxfoundation.org; Tu, Xiaobing; azurIt; Sameer Nanda
> Subject: Re: [PATCH] Fix race between oom kill and task exit
> 
> On 11/28, Michal Hocko wrote:
> >
> > They are both trying to solve the same issue. Neither of them is
> > optimal unfortunately.
> 
> yes, but this one doesn't look right.
> 
> > Oleg said he would look into this and I have seen some patches but
> > didn't geto check them.
> 
> Only preparations so far.
> 
> Oleg.

I was not aware there's a long story for this issue. I hit this issue a lot of times during stress test and root caused it. After applying my patch, I did extensive test on 5 machines for a long time, it does not reproduced anymore so I submitted the patch.

I will do more research on this issue.
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