From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Kennedy Subject: v3.0-rc* intermittent network failure: how to debug? Date: Thu, 21 Jul 2011 14:49:54 +0100 Message-ID: <1311256194.2980.18.camel@castor.rsk> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from lon1-post-1.mail.demon.net ([195.173.77.148]:34844 "EHLO lon1-post-1.mail.demon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750802Ab1GUNt4 (ORCPT ); Thu, 21 Jul 2011 09:49:56 -0400 Received: from rsk.demon.co.uk ([80.176.90.227] helo=[192.168.1.3]) by lon1-post-1.mail.demon.net with esmtp (Exim 4.69) id 1QjtdS-0000p8-Yk for netdev@vger.kernel.org; Thu, 21 Jul 2011 13:49:54 +0000 Sender: netdev-owner@vger.kernel.org List-ID: I keep seeing a total network failure on v3.0.0-rc* , it is highly intermittent, anything from 1 hour to 12+, and I don't have a reliable test case. When it fails I lose all network comms, but there are no errors in the system log, no hung tasks reported, nothing. But after it fails the machine hangs during shutdown, it just never turns off. So I guess something is getting stuck but I can't find it. Can you suggest how to find out what going on? Or how collect more information as to what's failing? I'm going to add a serial console and see if that helps. this is on a x86_64, via_velocity currently running 3.0.0-rc7 latest. all suggestions gratefully received regards Richard