From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754329AbZA0LIm (ORCPT ); Tue, 27 Jan 2009 06:08:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752690AbZA0LId (ORCPT ); Tue, 27 Jan 2009 06:08:33 -0500 Received: from e28smtp01.in.ibm.com ([59.145.155.1]:45370 "EHLO e28smtp01.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752582AbZA0LIc (ORCPT ); Tue, 27 Jan 2009 06:08:32 -0500 Date: Tue, 27 Jan 2009 16:38:23 +0530 From: Balbir Singh To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Suresh Siddha Subject: [mmotm] Backtrace __change_page_attr_set_clr Message-ID: <20090127110823.GO504@balbir.in.ibm.com> Reply-To: balbir@linux.vnet.ibm.com MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline 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 Hi, Andrew, I see the following backtrace with 2009-01-16-16-18 ------------[ cut here ]------------ WARNING: at arch/x86/mm/pageattr.c:560 __change_page_attr_set_clr+0xdc/0x891() ... CPA: called for zero pte. vaddr = ffff8800cfee2000 cpa->vaddr = ffff8800cfee2000 Modules linked in: coretemp hwmon kvm_intel kvm rtc_cmos rtc_core rtc_lib mptsas mptscsih mptbase scsi_transport_sas Pid: 3486, comm: dmidecode Not tainted 2.6.29-rc1 #2 Call Trace: [] warn_slowpath+0xd8/0xf5 [] __kernel_text_address+0x1a/0x26 [] print_context_stack+0x90/0xa6 [] find_usage_backwards+0xe/0xfc [] __lock_acquire+0x763/0x7ce [] __change_page_attr_set_clr+0x5b/0x891 [] __change_page_attr_set_clr+0x5b/0x891 [] __change_page_attr_set_clr+0xdc/0x891 [] __purge_vmap_area_lazy+0x195/0x1a2 [] __purge_vmap_area_lazy+0x4b/0x1a2 [] vm_unmap_aliases+0x1b9/0x1c8 [] vm_unmap_aliases+0x3d/0x1c8 [] change_page_attr_set_clr+0x13f/0x2f1 [] _spin_unlock+0x17/0x20 [] _set_memory_wb+0x1d/0x20 [] reserve_pfn_range+0x1a1/0x23a [] remap_pfn_range+0x90/0x33a [] phys_mem_access_prot_allowed+0x98/0x1b9 [] kmem_cache_alloc+0x94/0xbc [] mmap_mem+0x6c/0x91 [] mmap_region+0x262/0x4a9 [] do_mmap_pgoff+0x2a6/0x30d [] sys_mmap+0x8b/0x110 [] system_call_fastpath+0x16/0x1b ---[ end trace 21993f860dedca28 ]--- dmidecode:3486 reserve_pfn_range ioremap_change_attr failed write-back for cfee2000-cfee3000 dmidecode:3486 freeing invalid memtype cfee2000-cfee3000 I am yet to fully investigate the problem, but did not want to hold of reporting it. -- Balbir