From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: Nested GRE locking bug Date: Tue, 19 Oct 2010 11:02:36 +0200 Message-ID: <1287478956.2676.13.camel@edumazet-laptop> References: <1287028842.11178.68.camel@localhost> <1287029519.2649.108.camel@edumazet-laptop> <20101019.015303.104063240.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: ben@decadent.org.uk, netdev@vger.kernel.org, beatrice.barbe@gmail.com, 599816@bugs.debian.org To: David Miller Return-path: Received: from mail-fx0-f46.google.com ([209.85.161.46]:36177 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750871Ab0JSJCl (ORCPT ); Tue, 19 Oct 2010 05:02:41 -0400 Received: by fxm4 with SMTP id 4so1401735fxm.19 for ; Tue, 19 Oct 2010 02:02:40 -0700 (PDT) In-Reply-To: <20101019.015303.104063240.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-ID: Le mardi 19 octobre 2010 =C3=A0 01:53 -0700, David Miller a =C3=A9crit = : > From: Eric Dumazet > Date: Thu, 14 Oct 2010 06:11:59 +0200 >=20 > > net-next-2.6 contains a fix for this, adding the perc_cpu > > xmit_recursion limit. We might push it to net-2.6 >=20 > We need to think a bit more about this. >=20 > We are essentially now saying that one can only configure > tunnels 3 levels deep, and no more. >=20 > I can guarentee you someone out there uses at least 4, > perhaps more. >=20 > And those people will be broken by the new limit. >=20 > 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 ;)