Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753541AbcLJR2R (ORCPT ); Sat, 10 Dec 2016 12:28:17 -0500 Received: from mail.skyhub.de ([78.46.96.112]:33239 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751584AbcLJR2P (ORCPT ); Sat, 10 Dec 2016 12:28:15 -0500 Date: Sat, 10 Dec 2016 18:28:02 +0100 From: Borislav Petkov To: Josh Poimboeuf Cc: x86-ml , lkml Subject: Re: WARNING: kernel stack frame pointer at ffffffff82e03f40 in swapper:0 has bad value (null) Message-ID: <20161210172802.gpgjjndo56d43mi4@pd.tnic> References: <20161210161749.gvboowyhtffvpoo3@pd.tnic> <20161210170444.trpnnq4gtkx5djqm@treble> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20161210170444.trpnnq4gtkx5djqm@treble> 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: 1238 Lines: 34 On Sat, Dec 10, 2016 at 11:04:44AM -0600, Josh Poimboeuf wrote: > That's a new one. Was there anything else printed? It is the first line that appears in dmesg when I boot: [ 0.000000] WARNING: kernel stack frame pointer at ffffffffb5e03f40 in swapper:0 has bad value (null) [ 0.000000] Linux version 4.9.0-rc8+ (boris@gondor) (gcc version 6.2.0 20161109 (Debian 6.2.0-13) ) #1 SMP PREEMPT Sat Dec 10 13:25:29 CET 2016 [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.9.0-rc8+ root=/dev/sda7 ro earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 root=/dev/sda7 log_buf_len=10M resume=/dev/sda5 no_console_suspend ignore_loglevel [ 0.000000] KERNEL supported cpus: [ 0.000000] Intel GenuineIntel [ 0.000000] AMD AuthenticAMD [ 0.000000] Centaur CentaurHauls [ 0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' ... > Were you doing anything special when it happened? Not really - just booting ;-) > Do you see it reliably? 2 of 2 boots. > I should probably figure out a way to dump more data for that warning. Sure, I can test patches. Thanks. -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.