From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: 2.6.31.5 x86-64 KVM: 'emulation failed (pagetable) rip 7fb49335da7b 66 0f 7f 07' Date: Sun, 29 Nov 2009 12:43:29 +0200 Message-ID: <4B125051.6010506@redhat.com> References: <87skbzvdgd.fsf@spindle.srvr.nix> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, Linux-Kernel-Mailing-List To: Nix Return-path: Received: from mx1.redhat.com ([209.132.183.28]:30121 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752373AbZK2Kn0 (ORCPT ); Sun, 29 Nov 2009 05:43:26 -0500 In-Reply-To: <87skbzvdgd.fsf@spindle.srvr.nix> Sender: kvm-owner@vger.kernel.org List-ID: On 11/27/2009 11:56 PM, Nix wrote: > So I installed my first KVM guest image (a prerelease of Ubuntu 9.10 > that I had lying around) this morning (through virt-manager, as it > happens). Everything worked fine, the install was searingly fast > compared to the UML virtual machines I'm used to. > > I got back to it this evening, restarted the VM, and found that it had > suddenly slowed right down again, with one CPU being saturated with work > even when nothing was happening. Looking at the syslog shows (what would > be but for ratelimit) incredible numbers of these messages being logged: > > Nov 27 21:44:00 spindle info: [444857.792205] device vnet0 entered promiscuous mode > Nov 27 21:44:00 spindle info: [444857.794347] linux-net: port 2(vnet0) entering learning state > Nov 27 21:44:03 spindle warning: [444860.856640] __ratelimit: 928705 callbacks suppressed > Nov 27 21:44:03 spindle err: [444860.856729] emulation failed (pagetable) rip 7f3845f36a7b 66 0f 7f 07 > 66 0f 7f 07 movdqa %xmm0,(%rdi) which we don't emulate. Can you, using the qemu monitor, see where the guest is trying to write? (qemu) info registers (qemu) x/30i $eip - 20 -- error compiling committee.c: too many arguments to function