Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758186AbbGGV4i (ORCPT ); Tue, 7 Jul 2015 17:56:38 -0400 Received: from casper.infradead.org ([85.118.1.10]:52812 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758103AbbGGV42 (ORCPT ); Tue, 7 Jul 2015 17:56:28 -0400 Date: Tue, 7 Jul 2015 23:56:20 +0200 From: Peter Zijlstra To: Arthur Marsh Cc: Mathieu Desnoyers , linux-kernel@vger.kernel.org, Rusty Russell , rostedt , Oleg Nesterov , "Paul E. McKenney" Subject: Re: lock-up with module: Optimize __module_address() using a latched RB-tree Message-ID: <20150707215620.GM19282@twins.programming.kicks-ass.net> References: <55997889.5020101@internode.on.net> <20150706100447.GX3644@twins.programming.kicks-ass.net> <559A545A.80508@internode.on.net> <20150706103246.GY3644@twins.programming.kicks-ass.net> <559B63A2.4030601@internode.on.net> <20150707072951.GM3644@twins.programming.kicks-ass.net> <1736781680.1883.1436286785932.JavaMail.zimbra@efficios.com> <559C3371.2030704@internode.on.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <559C3371.2030704@internode.on.net> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1018 Lines: 28 On Wed, Jul 08, 2015 at 05:45:45AM +0930, Arthur Marsh wrote: > I'm not aware of any modules being loaded with --force . > > I've applied the patch, thanks! > > The resultant kernel locked up as follows: > > http://www.users.on.net/~arthur.marsh/20150708469.jpg This has "Not tainted" which would indeed rule out forced loading. So much for that idea :/ > http://www.users.on.net/~arthur.marsh/20150708470.jpg And that one has a bunch of NMI prints, curious those. But given Mathieu made them return NULL, that completely rules out the most interesting races. You could have a look at Documentation/networking/netconsole.txt and see if you can get that working between your machines; if you can get that to work you can maybe stop looking for that null-modem bit. -- 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/