From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757872Ab3BSBMf (ORCPT ); Mon, 18 Feb 2013 20:12:35 -0500 Received: from mailout02.c08.mtsvc.net ([205.186.168.190]:51231 "EHLO mailout02.c08.mtsvc.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754499Ab3BSBMe (ORCPT ); Mon, 18 Feb 2013 20:12:34 -0500 Message-ID: <1361236341.3263.11.camel@thor.lan> Subject: Re: [Bisected][-next-20130204+] [x86/kvm] udevd:[97]: segfault at ffffffffff5fd020 ip 00007fff069e277f sp 00007fff068c9ef8 error d From: Peter Hurley To: Marcelo Tosatti Cc: Gleb Natapov , "H. Peter Anvin" , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Date: Mon, 18 Feb 2013 20:12:21 -0500 In-Reply-To: <20130218225955.GA6166@amt.cnet> References: <1360715210.31472.20.camel@thor.lan> <511AE0A7.2000101@linux.intel.com> <20130213105129.GB9817@redhat.com> <1360756629.4803.5.camel@thor.lan> <20130218225955.GA6166@amt.cnet> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.6.3-0pjh1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Authenticated-User: 125194 peter@hurleysoftware.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2013-02-18 at 19:59 -0300, Marcelo Tosatti wrote: > On Wed, Feb 13, 2013 at 06:57:09AM -0500, Peter Hurley wrote: > > On Wed, 2013-02-13 at 12:51 +0200, Gleb Natapov wrote: > > > On Tue, Feb 12, 2013 at 04:39:03PM -0800, H. Peter Anvin wrote: > > > > On 02/12/2013 04:26 PM, Peter Hurley wrote: > > > > > With -next-20130204+ in ubuntu 12.10 VM (so the 80x25 VGA > > > > > device/console): > > > > > > > > > > [ 0.666410] udevd[97]: starting version 175 > > > > > [ 0.674043] udevd[97]: udevd:[97]: segfault at ffffffffff5fd020 ip 00007fff069e277f sp 00007fff068c9ef8 error d > > > > > > > > > > and boots to an initramfs prompt. > > > > > > > > > > git bisect (log attached) blames: > > > > > > > > > > commit 7b5c4a65cc27f017c170b025f8d6d75dabb11c6f > > > > > Merge: 3596f5b 949db15 > > > > > Author: H. Peter Anvin > > > > > Date: Fri Jan 25 16:31:21 2013 -0800 > > > > > > > > > > Merge tag 'v3.8-rc5' into x86/mm > > > > > > > > > > The __pa() fixup series that follows touches KVM code that is not > > > > > present in the existing branch based on v3.7-rc5, so merge in the > > > > > current upstream from Linus. > > > > > > > > > > Signed-off-by: H. Peter Anvin > > > > > > > > > > > > > > > This only happens with the VGA device/console but that is the default > > > > > configuration for Ubuntu/KVM because it blacklists pretty much every fb > > > > > driver. > > > > > > > > > > > > > I am guessing this is another bad use of __pa()... need to look into that. > > Can't find this commit on kvm.git or linux-2.6.git. Is it reproducible > there? This is in the linux-next repo (any git tag after 'next-20130204' will reproduce this). It's a pretty large merge commit. This doesn't happen on 3.8-rc7. I'll try to repro this on kvm.git sometime this week. Otherwise, we can wait for it to show up in 3.9. Regards, Peter Hurley