From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: 3.9.5+: Crash in tcp_input.c:4810. Date: Tue, 02 Jul 2013 21:41:52 -0700 Message-ID: <1372826512.4979.49.camel@edumazet-glaptop> References: <51BF50B3.1080403@candelatech.com> <1371493059.3252.200.camel@edumazet-glaptop> <51D1C620.8030007@candelatech.com> <1372813467.4979.46.camel@edumazet-glaptop> <51D398C0.5060802@candelatech.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: netdev To: Ben Greear Return-path: Received: from mail-pa0-f53.google.com ([209.85.220.53]:59467 "EHLO mail-pa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750706Ab3GCEly (ORCPT ); Wed, 3 Jul 2013 00:41:54 -0400 Received: by mail-pa0-f53.google.com with SMTP id tj12so7104655pac.12 for ; Tue, 02 Jul 2013 21:41:54 -0700 (PDT) In-Reply-To: <51D398C0.5060802@candelatech.com> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, 2013-07-02 at 20:21 -0700, Ben Greear wrote: > What kinds of things could a driver do to cause this. Maybe modify an > skb after it has sent it up the stack, or something like that? > It might be a genuine TCP bug, who knows... > We haven't been able to reproduce on a clean 3.10 yet...but it often takes days, > so we'll leave the test up through end of this week if we don't hit it > sooner... TCP collapse is/should be really rare, but losses can of course trigger it. > > I'll add your patch to my 3.9 tree. Thanks