Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753067AbcLLSK2 (ORCPT ); Mon, 12 Dec 2016 13:10:28 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57358 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752337AbcLLSK0 (ORCPT ); Mon, 12 Dec 2016 13:10:26 -0500 Date: Mon, 12 Dec 2016 12:10:25 -0600 From: Josh Poimboeuf To: Borislav Petkov Cc: x86-ml , lkml Subject: Re: WARNING: kernel stack frame pointer at ffffffff82e03f40 in swapper:0 has bad value (null) Message-ID: <20161212181025.uz3gk3jasuskqfmf@treble> References: <20161210161749.gvboowyhtffvpoo3@pd.tnic> <20161210170444.trpnnq4gtkx5djqm@treble> <20161210172802.gpgjjndo56d43mi4@pd.tnic> <20161212154542.ul6cnzjtkbvooluh@treble> <20161212175023.455mlwhmnqfew2nu@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20161212175023.455mlwhmnqfew2nu@pd.tnic> User-Agent: Mutt/1.6.0.1 (2016-04-01) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Mon, 12 Dec 2016 18:10:26 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 629 Lines: 13 On Mon, Dec 12, 2016 at 06:50:23PM +0100, Borislav Petkov wrote: > [ 0.000000] ffffffffbce03f40: 0000000000000000 ... > [ 0.000000] ffffffffbce03f48: ffffffffbc0001b5 (start_cpu+0x5/0x14) > [ 0.000000] ffffffffbce03f50: ffffffffbc0001b5 (start_cpu+0x5/0x14) > [ 0.000000] ffffffffbce03f58: 0000000000000000 ... > [ 0.000000] Linux version 4.9.0-rc8+ (root@gondor) (gcc version 6.2.0 20161109 (Debian 6.2.0-13) ) #2 SMP PREEMPT Mon Dec 12 18:36:48 CET 2016 Something funky is going on in the head code. It looks like start_cpu is getting executed twice somehow. Need to do some more head scratching... -- Josh