From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752899AbbIPNHs (ORCPT ); Wed, 16 Sep 2015 09:07:48 -0400 Received: from mail-pa0-f44.google.com ([209.85.220.44]:35266 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752145AbbIPNHq (ORCPT ); Wed, 16 Sep 2015 09:07:46 -0400 Subject: Re: [linux-next] oops in ip_route_input_noref To: Richard Alpe , Sergey Senozhatsky References: <20150916092447.GA945@swordfish> <55F9578C.40209@ericsson.com> Cc: "David S. Miller" , Alexey Kuznetsov , James Morris , netdev@vger.kernel.org, linux-kernel@vger.kernel.org From: David Ahern Message-ID: <55F9699E.5080807@cumulusnetworks.com> Date: Wed, 16 Sep 2015 07:07:42 -0600 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <55F9578C.40209@ericsson.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/16/15 5:50 AM, Richard Alpe wrote: > On 2015-09-16 11:24, Sergey Senozhatsky wrote: >> Hi, >> >> 4.3.0-rc1-next-20150916 >> >> oops after removal of rndis usb device Hi Sergey: Is this with KVM or baremetal? -----8<----- thanks for the analysis >> addr2line -e vmlinux -i 0xffffffff8146c0b1 >> net/ipv4/route.c:1815 >> net/ipv4/route.c:1905 >> >> >> which seems to be this line ip_route_input_noref()->ip_route_input_slow(): >> ... >> 1813 rth->rt_is_input = 1; >> 1814 if (res.table) >> 1815 rth->rt_table_id = res.table->tb_id; >> 1816 >> ... >> >> >> added by b7503e0cdb5dbec5d201aa69d8888c14679b5ae8 >> >> net: Add FIB table id to rtable >> >> Add the FIB table id to rtable to make the information available for >> IPv4 as it is for IPv6. >> >> >> -ss Hi Richard: > I to get an Oops in ip_route_input_noref(). It happens occasionally during bootup. > KVM environment using virtio driver. Let me know if you need any additional info or > if you want me to try to bisect it. > > Starting network... > ... > [ 0.877040] BUG: unable to handle kernel NULL pointer dereference at 0000000000000056 > [ 0.877597] IP: [] ip_route_input_noref+0x1a2/0xb00 Can you send me your kernel config and qemu command line? KVM with virtio networking is a primary test vehicle, and I did not encounter this at all. Thanks, David