Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933007AbcKBRXd (ORCPT ); Wed, 2 Nov 2016 13:23:33 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:60287 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932488AbcKBRXb (ORCPT ); Wed, 2 Nov 2016 13:23:31 -0400 Date: Wed, 2 Nov 2016 18:23:28 +0100 From: Sebastian Andrzej Siewior To: "M. Vefa Bicakci" Cc: "linux-kernel@vger.kernel.org" , "Charles (Chas) Williams" Subject: Re: [PREEMPT-RT] Oops in rapl_cpu_prepare() Message-ID: <20161102172327.qam4ylpewmwnnmlx@linutronix.de> References: <20161028080324.b6nnwaljmzxiyykx@linutronix.de> <26425897-5229-d2c5-1e1b-a08442441f68@runbox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <26425897-5229-d2c5-1e1b-a08442441f68@runbox.com> User-Agent: NeoMutt/20161014 (1.7.1) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 638 Lines: 18 On 2016-11-01 13:15:53 [+0300], M. Vefa Bicakci wrote: > Hello Sebastian, Hi, > The patch fixes the kernel oops for me. > > I am using a custom 4.8.5-based kernel on Qubes OS R3.2, which is based > on Xen 4.6.3. Apparently, Xen also has a similar bug/flaw/quirk regarding > the allocation of package identifiers for the virtual CPUs. > > Prior to your patch, my Xen-based virtual machines would intermittently > crash most of the time at boot-up with the backtrace reported by Charles. > Due to this, I was under the impression that this is a subtle race > condition. how hard is it to get such a xen setup up and running? Sebastian