From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751360Ab3ASGiM (ORCPT ); Sat, 19 Jan 2013 01:38:12 -0500 Received: from zeniv.linux.org.uk ([195.92.253.2]:47547 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750959Ab3ASGiK (ORCPT ); Sat, 19 Jan 2013 01:38:10 -0500 Date: Sat, 19 Jan 2013 06:38:08 +0000 From: Al Viro To: Nicolas Dichtel Cc: linux-kernel@vger.kernel.org Subject: Re: Issues with "x86, um: switch to generic fork/vfork/clone" commit Message-ID: <20130119063808.GN4939@ZenIV.linux.org.uk> References: <50F3D2F2.3080200@6wind.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <50F3D2F2.3080200@6wind.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 14, 2013 at 10:42:10AM +0100, Nicolas Dichtel wrote: > Hi, > > I'm running a virtual host (kvm/qemu x86 32 bits 16 CPUs, debian > wheezy) over a x86 64bits target. > The virtual host has problem during the boot with recent kernels > (sometimes, daemons crash, but not always, and not always the same > daemon). Here is an example: > [ 2.150274] input: ImExPS/2 Generic Explorer Mouse as > /devices/platform/i8042/serio1/input/input3 > udevd[468]: timeout: killing 'firmware.agent' [587] > > udevd[468]: 'firmware.agent' [587] terminated by signal 9 (Killed) > > done. > > [snip] > > [ 64.313636] kbd[2563]: segfault at 9fe ip 000009fe sp b758293c > error 4 in dash[8048000+18000] > > After bisecting, the following commit seems responsible: > 1d4b4b2994b5fc208963c0b795291f8c1f18becf (x86, um: switch to generic > fork/vfork/clone) Er... Bisect of the guest kernel, I take it? Could you check if building the guest !SMP affects anything?