From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755818Ab3KVV2G (ORCPT ); Fri, 22 Nov 2013 16:28:06 -0500 Received: from relay2.sgi.com ([192.48.179.30]:53926 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755248Ab3KVV2B (ORCPT ); Fri, 22 Nov 2013 16:28:01 -0500 Date: Fri, 22 Nov 2013 15:28:07 -0600 From: Alex Thorlton To: Mel Gorman Cc: Rik van Riel , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: BUG: mm, numa: test segfaults, only when NUMA balancing is on Message-ID: <20131122212807.GR3062@sgi.com> References: <20131016155429.GP25735@sgi.com> <20131104145828.GA1218@suse.de> <20131104200346.GA3066@sgi.com> <20131106131048.GC4877@suse.de> <20131107214838.GY3066@sgi.com> <20131108112054.GB5040@suse.de> <20131108221329.GD4236@sgi.com> <20131112212902.GA4725@sgi.com> <20131115000901.GB26002@suse.de> <20131115144504.GE26002@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131115144504.GE26002@suse.de> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > If the warning added by that patch does *not* trigger than can you also > test this patch? It removes the barriers which should not be necessary > and takes a reference tot he page before waiting on the lock. The > previous version did not take the reference because otherwise the > WARN_ON could not distinguish between a migration waiter and a surprise > gup. Sorry for the delay; been a bit busy. I tested both of these patches on top of this one (separately, of course): http://www.spinics.net/lists/linux-mm/msg63919.html I think that's the one you were referring to, if not send me a pointer to the correct one and I'll give it another shot. Both patches still segfaulted, so it doesn't appear that either of these solved the problem. If you have anything else you'd like for me to try let me know. - Alex