From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753139Ab0INI0h (ORCPT ); Tue, 14 Sep 2010 04:26:37 -0400 Received: from hera.kernel.org ([140.211.167.34]:38849 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752062Ab0INI0e (ORCPT ); Tue, 14 Sep 2010 04:26:34 -0400 Message-ID: <4C8F31A9.7070507@kernel.org> Date: Tue, 14 Sep 2010 10:26:17 +0200 From: Tejun Heo User-Agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.2.9) Gecko/20100825 Lightning/1.0b2 Thunderbird/3.1.3 MIME-Version: 1.0 To: CAI Qian CC: linux-kernel , Avi Kivity , Marcelo Tosatti , dhowells@redhat.com, graff.yang@gmail.com, sonic.adi@gmail.com, kexec Subject: Re: kvm kdump regression References: <149379123.860951284433779554.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> In-Reply-To: <149379123.860951284433779554.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> X-Enigmail-Version: 1.1.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Tue, 14 Sep 2010 08:26:19 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/14/2010 05:09 AM, CAI Qian wrote: > This commit introduced a regression that an empty vmcore was generated on a kvm guest. > ioremap: invalid physical address db74000000000000 > ------------[ cut here ]------------ > WARNING: at arch/x86/mm/ioremap.c:83 __ioremap_caller+0x307/0x380() > Hardware name: KVM > Modules linked in: > Pid: 1, comm: swapper Not tainted 2.6.36-rc2-mm1+ #2 > Call Trace: > [] warn_slowpath_common+0x7f/0xc0 > [] ? copy_oldmem_page+0x4e/0xc0 > [] warn_slowpath_null+0x1a/0x20 > [] __ioremap_caller+0x307/0x380 > [] ioremap_nocache+0x17/0x20 > [] copy_oldmem_page+0x4e/0xc0 > [] read_from_oldmem+0x7a/0xb0 > [] merge_note_headers_elf64.clone.1+0x6c/0x21f > [] ? copy_oldmem_page+0x8e/0xc0 > [] ? read_from_oldmem+0x7a/0xb0 > [] vmcore_init+0x19d/0x396 > [] ? vmcore_init+0x0/0x396 > [] do_one_initcall+0x43/0x190 > [] kernel_init+0x2a0/0x330 > [] kernel_thread_helper+0x4/0x10 > [] ? kernel_init+0x0/0x330 > [] ? kernel_thread_helper+0x0/0x10 > ---[ end trace 93d72a36b9146f22 ]--- > Kdump: vmcore not initialized > > commit 020ec6537aa65c18e9084c568d7b94727f2026fd > Author: Tejun Heo > Date: Fri Apr 9 18:57:00 2010 +0900 > > percpu: factor out pcpu_addr_in_first/reserved_chunk() and update per_cpu_ptr_to_phys() Hmm... I'm confused. Isn't this the one fixed by commit 9983b6f0 (percpu: fix first chunk match in per_cpu_ptr_to_phys())? Thanks. -- tejun