Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752961Ab3GVMTN (ORCPT ); Mon, 22 Jul 2013 08:19:13 -0400 Received: from s15338416.onlinehome-server.info ([87.106.68.36]:60118 "EHLO order.stressinduktion.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751767Ab3GVMTM (ORCPT ); Mon, 22 Jul 2013 08:19:12 -0400 Date: Mon, 22 Jul 2013 14:19:11 +0200 From: Hannes Frederic Sowa To: Fan Du Cc: "Srivatsa S. Bhat" , netdev@vger.kernel.org, "linux-kernel@vger.kernel.org" Subject: Re: [BUG] ipv6, rawv6_close(): BUG: unable to handle kernel paging request Message-ID: <20130722121911.GB6538@order.stressinduktion.org> Mail-Followup-To: Fan Du , "Srivatsa S. Bhat" , netdev@vger.kernel.org, "linux-kernel@vger.kernel.org" References: <51EC283D.5010208@linux.vnet.ibm.com> <51ED09A6.1020605@windriver.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <51ED09A6.1020605@windriver.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1620 Lines: 56 On Mon, Jul 22, 2013 at 06:29:58PM +0800, Fan Du wrote: > Hallo Srivatsa > > > On 2013年07月22日 02:28, Srivatsa S. Bhat wrote: > >Hi, > > > >I'm seeing this on every boot. > > > >Version: Latest mainline (commit ea45ea70b) > > I tested with this commit using your updated IPv6 config, this incident > didn't show up after several times of reboot. > Could you please elaborate your testing details if possible? > > A wild guess, it dereference mrt->mroute6_sk, indicating mrt is invalid. Yes, that seems to be the case. Could you test the following patch if you have a bit of time? rtnl_lock is for some functions down lower the call stack in ip6mr_free_table. diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c index 583e8d4..03986d3 100644 --- a/net/ipv6/ip6mr.c +++ b/net/ipv6/ip6mr.c @@ -259,10 +259,12 @@ static void __net_exit ip6mr_rules_exit(struct net *net) { struct mr6_table *mrt, *next; + rtnl_lock(); list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) { list_del(&mrt->list); ip6mr_free_table(mrt); } + rtnl_unlock(); fib_rules_unregister(net->ipv6.mr6_rules_ops); } #else @@ -289,7 +291,10 @@ static int __net_init ip6mr_rules_init(struct net *net) static void __net_exit ip6mr_rules_exit(struct net *net) { + rtnl_lock(); ip6mr_free_table(net->ipv6.mrt6); + net->ipv6.mrt6 = NULL; + rtnl_unlock(); } #endif -- 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/