From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262632AbUDDTPX (ORCPT ); Sun, 4 Apr 2004 15:15:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262635AbUDDTPX (ORCPT ); Sun, 4 Apr 2004 15:15:23 -0400 Received: from ppp-217-133-42-200.cust-adsl.tiscali.it ([217.133.42.200]:12463 "EHLO dualathlon.random") by vger.kernel.org with ESMTP id S262632AbUDDTPS (ORCPT ); Sun, 4 Apr 2004 15:15:18 -0400 Date: Sun, 4 Apr 2004 21:15:20 +0200 From: Andrea Arcangeli To: Marcello Barnaba Cc: linux-kernel@vger.kernel.org Subject: Re: 2.6.5-aa1: Badness in __remove_from_page_cache at mm/filemap.c:104 && page_remove_rmap at mm/objrmap.c:379 Message-ID: <20040404191520.GA482@dualathlon.random> References: <1081103153.13362.21.camel@nowhere.openssl.softmedia.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1081103153.13362.21.camel@nowhere.openssl.softmedia.lan> User-Agent: Mutt/1.4.1i X-GPG-Key: 1024D/68B9CB43 13D9 8355 295F 4823 7C49 C012 DFA1 686E 68B9 CB43 X-PGP-Key: 1024R/CB4660B9 CC A0 71 81 F4 A0 63 AC C0 4B 81 1D 8C 15 C8 E5 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Apr 04, 2004 at 08:25:53PM +0200, Marcello Barnaba wrote: > Hi Andrea, > > I've just installed 2.6.5-aa1, and after some hours of uptime and > testing, with everything working properly, I experienced some WARN_ON() > triggered (my syslog became quite big :). > > I've got both the nvidia and vmware modules installed. > > The bug is fully reproducible, you just have to suspend a virtual > machine from the vmware GUI, vmware-vmx starts using 100%CPU (just one > in my 2-way SMP system), and the syslog is completely _filled_ with call > traces: > > vjt@nowhere:~$ grep Badness.in.page.remove.rmap /var/log/syslog | wc -l > 8859 > vjt@nowhere:~$ grep Badness.in.__remove_from_pa /var/log/syslog | wc -l > 8767 > > And here there are two of them (they are all identical). > First occur the 8700 __remove_from_page_cache() warnings, and then the > page_remove_rmap() ones. that's an xfs bug found by Andrew, it started to be visible in -aa because of the objrmap hardness checks from Dave. You can safely ignore it, the xfs folks are already testing a fix. I didn't delete the WARN_ON because it's a race condition we want to trap, but you can go ahead and delete by hand mm/filemap.c:104 and mm/objrmap.c:379 if you're annoyed by these warning messages. Kernel will work as stable as mainline despite of the warnings.