From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Hansen Subject: Re: kvm causing memory corruption? now 2.6.26-rc4 Date: Fri, 06 Jun 2008 00:41:45 -0700 Message-ID: <1212738105.7837.3.camel@nimitz> References: <1206479576.7562.21.camel@nimitz.home.sr71.net> <47EA1C63.8010202@qumranet.com> <1206550329.7883.5.camel@nimitz.home.sr71.net> <47EA80AC.4070204@qumranet.com> <1206551794.7883.7.camel@nimitz.home.sr71.net> <47EB6AAC.3040607@qumranet.com> <47EB7281.6070300@qumranet.com> <1206629709.7883.30.camel@nimitz.home.sr71.net> <47EBB63E.2060306@qumranet.com> <1212445810.8211.9.camel@nimitz.home.sr71.net> <48469BDA.3050206@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: "linux-kernel@vger.kernel.org" , kvm-devel , "Anthony N. Liguori [imap]" To: Avi Kivity Return-path: Received: from e31.co.us.ibm.com ([32.97.110.149]:50272 "EHLO e31.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755682AbYFFHls (ORCPT ); Fri, 6 Jun 2008 03:41:48 -0400 In-Reply-To: <48469BDA.3050206@qumranet.com> Sender: kvm-owner@vger.kernel.org List-ID: On Wed, 2008-06-04 at 16:42 +0300, Avi Kivity wrote: > Dave Hansen wrote: ... > > After collecting all those, I turned on CONFIG_DEBUG_HIGHMEM and the > > oopses miraculously stopped. But, the guest hung (for at least 5 > > minutes or so) during windows bootup, pegging my host CPU. Most of the > > CPU was going to klogd, so I checked dmesg. > > > Can you check with mem=900 (and CONFIG_HIGHMEM_DEBUG=n)? That will > confirm that the problems are highmem related, but not physical address > truncation related. Do you mean 800M? ;) Highmem begins at 896MB if I remember correctly. Anyway, it still oopses on current git with mem=800M > > I was seeing messages like this > > > > [ 428.918108] kvm_handle_exit: unexpected, valid vectoring info and exit reason is 0x9 > > > > And quite a few of them, like 100,000/sec. That's why klogd was pegging > > the CPU. Any idea on a next debugging step? > > > That's a task switch. Newer kvms handle them. Newer userspace? I'm running current kvm-git userspace as of a day or two ago. -- Dave