From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760192AbZACVpH (ORCPT ); Sat, 3 Jan 2009 16:45:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759927AbZACVos (ORCPT ); Sat, 3 Jan 2009 16:44:48 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:45745 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933034AbZACVor (ORCPT ); Sat, 3 Jan 2009 16:44:47 -0500 Date: Sat, 3 Jan 2009 16:44:43 -0500 From: Christoph Hellwig To: Nick Piggin Cc: Peter Klotz , Roman Kononov , linux-kernel@vger.kernel.org, xfs@oss.sgi.com Subject: Re: BUG: soft lockup - is this XFS problem? Message-ID: <20090103214443.GA6612@infradead.org> References: <20081223171259.GA11945@infradead.org> <20081230042333.GC27679@wotan.suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20081230042333.GC27679@wotan.suse.de> User-Agent: Mutt/1.5.18 (2008-05-17) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 30, 2008 at 05:23:33AM +0100, Nick Piggin wrote: > On Tue, Dec 23, 2008 at 12:12:59PM -0500, Christoph Hellwig wrote: > > > > Nick, I've seen various reports like this by Roman. It seems to be > > caused by an interaction of the lockless pagecache with the xfs > > I/O code. Any idea what might be wrong here: > > Hmm, it could get into a loop here if there is a page in the pagecache > with a zero refcount, which might be a problem with XFS... other looping > conditions might indicate a problem iwth lockless pagecache or radix > tree. It would be very helpful to know what condition it is looping on... See http://oss.sgi.com/bugzilla/show_bug.cgi?id=805 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.12.11.20060308/8.12.11/SuSE Linux 0.7) with ESMTP id n03LjIEo006225 for ; Sat, 3 Jan 2009 15:45:19 -0600 Received: from bombadil.infradead.org (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id EFDF55C990 for ; Sat, 3 Jan 2009 13:45:17 -0800 (PST) Received: from bombadil.infradead.org (bombadil.infradead.org [18.85.46.34]) by cuda.sgi.com with ESMTP id qh3KSisi6FqvE0HN for ; Sat, 03 Jan 2009 13:45:17 -0800 (PST) Date: Sat, 3 Jan 2009 16:44:43 -0500 From: Christoph Hellwig Subject: Re: BUG: soft lockup - is this XFS problem? Message-ID: <20090103214443.GA6612@infradead.org> References: <20081223171259.GA11945@infradead.org> <20081230042333.GC27679@wotan.suse.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20081230042333.GC27679@wotan.suse.de> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Nick Piggin Cc: Peter Klotz , linux-kernel@vger.kernel.org, Roman Kononov , xfs@oss.sgi.com On Tue, Dec 30, 2008 at 05:23:33AM +0100, Nick Piggin wrote: > On Tue, Dec 23, 2008 at 12:12:59PM -0500, Christoph Hellwig wrote: > > > > Nick, I've seen various reports like this by Roman. It seems to be > > caused by an interaction of the lockless pagecache with the xfs > > I/O code. Any idea what might be wrong here: > > Hmm, it could get into a loop here if there is a page in the pagecache > with a zero refcount, which might be a problem with XFS... other looping > conditions might indicate a problem iwth lockless pagecache or radix > tree. It would be very helpful to know what condition it is looping on... See http://oss.sgi.com/bugzilla/show_bug.cgi?id=805 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs