Date: Tue, 25 Mar 2008 15:56:07 +0100
From: Andi Kleen <andi@firstfloor.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: Andi Kleen <andi@firstfloor.org>, Krzysztof Halasa <khc@pm.waw.pl>,
       Andrew Morton <akpm@linux-foundation.org>,
       Oleg Nesterov <oleg@tv-sign.ru>, ebiederm@xmission.com,
       xemul@openvz.org, sds@tycho.nsa.gov, roland@redhat.com,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ptrace: it is fun to strace /sbin/init
Message-ID: <20080325145607.GQ2170@one.firstfloor.org>
References: <20080323135110.GA294@tv-sign.ru> <20080324152906.dee7b272.akpm@linux-foundation.org> <20080324225611.GA157@tv-sign.ru> <20080324160819.cea2d921.akpm@linux-foundation.org> <87r6dzi0mw.fsf@basil.nowhere.org> <m3fxuedh3m.fsf@maximus.localdomain> <20080325142259.GO2170@one.firstfloor.org> <20080325144753.GA4128@ucw.cz>
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On Tue, Mar 25, 2008 at 03:47:54PM +0100, Pavel Machek wrote:
> Hi!
> 
> > > > I like the general idea -- i used to patch kernels to allow this too,
> > > > but it is dangerous.
> > > 
> > > Though root-only. Root doesn't want to be limited and knows better
> > > anyway. 
> > 
> > The problem is that you can deadlock if you are not very careful.
> 
> How is that different from ptracing any other process with _lot_ of
> children -- like X? You'll get same zombies in both cases, leading to
> same issues, no?

There is no unresolvable deadlock no.

-Andi
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