Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756680Ab0AMXuS (ORCPT ); Wed, 13 Jan 2010 18:50:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755986Ab0AMXuQ (ORCPT ); Wed, 13 Jan 2010 18:50:16 -0500 Received: from one.firstfloor.org ([213.235.205.2]:57602 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756660Ab0AMXuO (ORCPT ); Wed, 13 Jan 2010 18:50:14 -0500 Date: Thu, 14 Jan 2010 00:50:10 +0100 From: Andi Kleen To: "Rafael J. Wysocki" Cc: =?iso-8859-1?Q?Am=E9rico?= Wang , Andi Kleen , Linux Kernel Mailing List , Kernel Testers List Subject: Re: [Bug #15041] Pagemap endless read loop with LTP Message-ID: <20100113235010.GF24818@basil.fritz.box> References: <2375c9f91001121904h2857760akbf2dd2c9f7441fc5@mail.gmail.com> <201001132257.34123.rjw@sisk.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <201001132257.34123.rjw@sisk.pl> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1574 Lines: 41 On Wed, Jan 13, 2010 at 10:57:34PM +0100, Rafael J. Wysocki wrote: > On Wednesday 13 January 2010, Am?rico Wang wrote: > > On Mon, Jan 11, 2010 at 6:32 AM, Rafael J. Wysocki wrote: > > > This message has been generated automatically as a part of a report > > > of recent regressions. > > > > > > The following bug entry is on the current list of known regressions > > > from 2.6.32. Please verify if it still should be listed and let me know > > > (either way). > > > > > > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=15041 > > > Subject : Pagemap endless read loop with LTP > > > Submitter : Andi Kleen > > > Date : 2010-01-10 2:09 (1 days old) > > > References : http://marc.info/?l=linux-kernel&m=126308941423848&w=4 > > > > > > > According to Andi's later reply, it shoud not be an endless loop, > > it just takes a rather long time. > > Andi? It'll try to read 47 bits worth of 0s on 64bit x86-64. I haven't tried to wait until that finishes, but I estimate a few months of CPU time at least. The interface is just misdesigned, but I guess we cannot do anything about that for now. LTP will just need to do a workaround. This unfortunately breaks older LTP versions. -Andi -- ak@linux.intel.com -- Speaking for myself only. -- 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/