From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH] ipv6: fix possible seqlock deadlock in ip6_finish_output2 Date: Sat, 30 Nov 2013 12:49:05 -0500 (EST) Message-ID: <20131130.124905.1525994055463627833.davem@davemloft.net> References: <20131128192231.GE24171@order.stressinduktion.org> <20131129053944.GH24171@order.stressinduktion.org> <1385829955.5352.40.camel@edumazet-glaptop2.roam.corp.google.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: hannes@stressinduktion.org, jongman.heo@samsung.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org To: eric.dumazet@gmail.com Return-path: In-Reply-To: <1385829955.5352.40.camel@edumazet-glaptop2.roam.corp.google.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Eric Dumazet Date: Sat, 30 Nov 2013 08:45:55 -0800 > On Fri, 2013-11-29 at 06:39 +0100, Hannes Frederic Sowa wrote: >> IPv6 stats are 64 bits and thus are protected with a seqlock. By not >> disabling bottom-half we could deadlock here if we don't disable bh and >> a softirq reentrantly updates the same mib. >> >> Cc: Eric Dumazet >> Signed-off-by: Hannes Frederic Sowa >> --- > > Acked-by: Eric Dumazet > > (Note that the seqlock is only for 32bit arches) Applied and queued up for -stable, thanks.