Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755297Ab3HBCsl (ORCPT ); Thu, 1 Aug 2013 22:48:41 -0400 Received: from plane.gmane.org ([80.91.229.3]:44616 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754176Ab3HBCsj (ORCPT ); Thu, 1 Aug 2013 22:48:39 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Cong Wang Subject: Re: PROBLEM: 3.11.0-rc2+ lost of connectivity Date: Fri, 2 Aug 2013 02:47:50 +0000 (UTC) Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 60.160.69.36 User-Agent: slrn/0.9.9p1 (Linux) Cc: netdev@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1098 Lines: 22 On Thu, 01 Aug 2013 at 14:34 GMT, Sebastiano Spicuglia wrote: > > The machine suddenly stops to be connected to the network. > Running "ifdown eth0" "ifup eth0" the network starts to work > again for few minutes and then the failure happens again. > It is not even possible to ping the machine. > /var/log/messages does not report anything wrong. > > I instrumented the kernel with SystemTap to see what happens when the > machine is in the failure state. > > the function ip_rcv is invoked. > the function ip_rcv_finish is invoked. > the function ip_local_deliver is invoked > the function ip_local_deliver_finish is invoked > the function tcp_v4_rcv is NOT invoked > > When the network works the function tcp_v4_rcv is invoked. > Please turn off your firewall and run dropwatch to see where the packets are dropped. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/