From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760957AbYEMPdT (ORCPT ); Tue, 13 May 2008 11:33:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757181AbYEMPdE (ORCPT ); Tue, 13 May 2008 11:33:04 -0400 Received: from bzq-179-150-194.static.bezeqint.net ([212.179.150.194]:11621 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756782AbYEMPdB (ORCPT ); Tue, 13 May 2008 11:33:01 -0400 Message-ID: <4829B4AC.6090909@qumranet.com> Date: Tue, 13 May 2008 18:33:00 +0300 From: Avi Kivity User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: linux-kernel CC: Ingo Molnar Subject: Re: [BUG] cpu hotplug vs scheduler References: <4829A6A0.5040208@qumranet.com> In-Reply-To: <4829A6A0.5040208@qumranet.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Avi Kivity wrote: > I'm testing host cpu hotplug with kvm. Basically running 7 guests on > a 4 core machine, offlining and onlining host cpus at random. > Eventually I hit this: > [snip oops] > This seems to be the assignment to cfs_rq after pick_next_entity(). > > I'm running kvm.git, which is currently 2.6.26-rc2 plus a few kvm > patches. It could be kvm's fault, but it doesn't appear so from the > traces. > I get the same oops running with the kvm modules unloaded. None of kvm.git's changes are in core code, so this is definitely a mainline problem. It took about 40 minutes to reproduce; 1200 cpus onlined and 1200 cpus offlined. -- error compiling committee.c: too many arguments to function