From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Bloniarz Subject: Re: Multicast packet loss Date: Tue, 07 Apr 2009 16:08:26 -0400 Message-ID: <49DBB2BA.1010100@athenacr.com> References: <49B4B909.7050002@cosmosbay.com> <20090313.145152.121603300.davem@davemloft.net> <49BADE87.40407@cosmosbay.com> <20090313.153851.11725991.davem@davemloft.net> <49BED109.3020504@cosmosbay.com> <49D66379.7070106@athenacr.com> <49D8B6DA.7050902@cosmosbay.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: David Miller , kchang@athenacr.com, netdev@vger.kernel.org, cl@linux-foundation.org To: Eric Dumazet Return-path: Received: from sprinkles.athenacr.com ([64.95.46.210]:1040 "EHLO sprinkles.inp.in.athenacr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753692AbZDGUIa (ORCPT ); Tue, 7 Apr 2009 16:08:30 -0400 In-Reply-To: <49D8B6DA.7050902@cosmosbay.com> Sender: netdev-owner@vger.kernel.org List-ID: Eric Dumazet wrote: > Brian Bloniarz a =E9crit : >> We've been experimenting with this softirq-delay patch in productio= n, and >> have seen some hard-to-reproduce crashes. We finally managed to cap= ture a >> kexec crashdump this morning. > > Pointer being null might tell us that we managed to call inet_def_re= adable() > without socket lock hold... =46alse alarm -- I think I did the backport to 2.6.24 incorrectly. 2.6.= 24 was before the UDP receive path started taking the socket lock, so inet_def_readable's assumption doesn't hold. Sorry to waste everyone's time. Thanks, Brian Bloniarz