netdev - Re: Nested GRE locking bug

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Message-ID: <1287478956.2676.13.camel@edumazet-laptop>
Date:	Tue, 19 Oct 2010 11:02:36 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	ben@...adent.org.uk, netdev@...r.kernel.org,
	beatrice.barbe@...il.com, 599816@...s.debian.org
Subject: Re: Nested GRE locking bug

Le mardi 19 octobre 2010 à 01:53 -0700, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Thu, 14 Oct 2010 06:11:59 +0200
> 
> > net-next-2.6 contains a fix for this, adding the perc_cpu
> > xmit_recursion limit. We might push it to net-2.6
> 
> We need to think a bit more about this.
> 
> We are essentially now saying that one can only configure
> tunnels 3 levels deep, and no more.
> 
> I can guarentee you someone out there uses at least 4,
> perhaps more.
> 
> And those people will be broken by the new limit.
> 
> So putting this into net-2.6 with such a low limit will
> be quite dangerous.

Well limit is actually 4, but I get your point ;)



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