From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from hera.kernel.org ([140.211.167.34]) by bombadil.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1Ow9Nk-0001F6-5M for kexec@lists.infradead.org; Thu, 16 Sep 2010 07:59:48 +0000 Message-ID: <4C91CE6E.5030500@kernel.org> Date: Thu, 16 Sep 2010 09:59:42 +0200 From: Tejun Heo MIME-Version: 1.0 Subject: Re: [PATCH] fix kvm kdump regression References: <1301046921.1075601284613078206.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> In-Reply-To: <1301046921.1075601284613078206.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: caiqian@redhat.com Cc: graff.yang@gmail.com, Marcelo Tosatti , kexec , linux-kernel , Cliff Wickman , dhowells@redhat.com, sonic.adi@gmail.com, Chris Lalancette , Avi Kivity , stable@kernel.org On 09/16/2010 06:57 AM, caiqian@redhat.com wrote: > 020ec6537aa65c18e9084c568d7b94727f2026fd introduced a regression that an empty vmcore was generated during kdump 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 > > This patch fixed it by reverting a chunk of the above commit and 9983b6f0cf8263e51bcf4c8a9dc0c1ef175b3c60 which is based on it. > > Signed-off-by: CAI Qian Sorry about the delay but I'm prepping a debug patch. Let's root cause and see if it can be fixed without reverting it as there are further changes which depend on the commit and we'll have to hunt it down anyway. Thanks. -- tejun _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec