Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762082Ab0GUDGm (ORCPT ); Tue, 20 Jul 2010 23:06:42 -0400 Received: from complete.lackof.org ([198.49.126.79]:39674 "EHLO complete.lackof.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762049Ab0GUDGl (ORCPT ); Tue, 20 Jul 2010 23:06:41 -0400 Date: Tue, 20 Jul 2010 21:06:29 -0600 From: dann frazier To: KAMEZAWA Hiroyuki Cc: linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, Hugh Dickins , Rik van Riel , KOSAKI Motohiro , Nick Piggin , Mel Gorman , Minchan Kim , Ralf Baechle Subject: Re: ia64 hang/mca running gdb 'make check' Message-ID: <20100721030629.GA9987@lackof.org> References: <20100720173512.GF26783@ldl.fc.hp.com> <20100721105136.9d4440de.kamezawa.hiroyu@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100721105136.9d4440de.kamezawa.hiroyu@jp.fujitsu.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2131 Lines: 48 On Wed, Jul 21, 2010 at 10:51:36AM +0900, KAMEZAWA Hiroyuki wrote: > On Tue, 20 Jul 2010 11:35:12 -0600 > dann frazier wrote: > > > Debian's ia64 autobuilders have been experiencing system crashes while > > trying to run the gdb test suite: > > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=588574 > > > > I was able to reproduce this w/ the latest git tree, and bisected it > > down to this commit, introduced in 2.6.32: > > > > commit 62eede62dafb4a6633eae7ffbeb34c60dba5e7b1 > > Author: Hugh Dickins > > Date: Mon Sep 21 17:03:34 2009 -0700 > > > > mm: ZERO_PAGE without PTE_SPECIAL > > > > Reinstate anonymous use of ZERO_PAGE to all architectures, not just to > > those which __HAVE_ARCH_PTE_SPECIAL: as suggested by Nick Piggin. > > > > Contrary to how I'd imagined it, there's nothing ugly about this, just a > > zero_pfn test built into one or another block of vm_normal_page(). > > > > But the MIPS ZERO_PAGE-of-many-colours case demands is_zero_pfn() and > > my_zero_pfn() inlines. Reinstate its mremap move_pte() shuffling of > > ZERO_PAGEs we did from 2.6.17 to 2.6.19? Not unless someone shouts for > > that: it would have to take vm_flags to weed out some cases. > > > > fyi, I found this to not be reproducible on SLES11 SP1 (which is > > 2.6.32-based). I compared the .configs and found that the relevant > > difference is the PAGE_SIZE. It does not fail w/ 64KB pages, but > > reliably fails w/ 16KB pages. > > > > Sorry, I have no idea... > Hmm, what is the address of empty_zero_page[] on your debian(16kb-page) ? dannf@krebs:~$ grep empty_zero_page /boot/System.map-2.6.32-5-mckinley a0000001008784c0 d __ksymtab_empty_zero_page a000000100882688 d __kcrctab_empty_zero_page a000000100884ca4 r __kstrtab_empty_zero_page a000000100974000 D empty_zero_page -- 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/