linux-kernel - Re: [PATCH 0/4] forkbomb killer

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Message-Id: <20110414093549.80539260.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 14 Apr 2011 09:35:49 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Michel Lespinasse <walken@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	Andrey Vagin <avagin@...nvz.org>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 0/4] forkbomb killer

On Thu, 14 Apr 2011 09:20:41 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> Hi, Minchan, Kamezawa-san,
> 
> > >> So whenever user push sysrq, older tasks would be killed and at last,
> > >> root forkbomb task would be killed.
> > >>
> > >
> > > Maybe good for a single user system and it can send Sysrq.
> > > But I myself not very excited with this new feature becasuse I need to
> > > run to push Sysrq ....
> > >
> > > Please do as you like, I think the idea itself is interesting.
> > > But I love some automatic ones. I do other jobs.
> > 
> > Okay. Thanks for the comment, Kame.
> > 
> > I hope Andrew or someone gives feedback forkbomb problem itself before
> > diving into this.
> 
> May I ask current status of this thread? I'm unhappy if our kernel keep 
> to have forkbomb weakness. ;)

I've stopped updating but can restart at any time. (And I found a bug ;)

> Can we consider to take either or both idea?
> 
I think yes, both idea can be used.
One idea is
 - kill all recent threads by Sysrq. The user can use Sysrq multiple times
   until forkbomb stops.
Another(mine) is
 - kill all problematic in automatic. This adds some tracking costs but
   can be configurable.

Thanks,
-Kame

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