From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755576Ab3AKNe0 (ORCPT ); Fri, 11 Jan 2013 08:34:26 -0500 Received: from mail.skyhub.de ([78.46.96.112]:45933 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753219Ab3AKNeX (ORCPT ); Fri, 11 Jan 2013 08:34:23 -0500 Date: Fri, 11 Jan 2013 14:34:22 +0100 From: Borislav Petkov To: "Alexander E. Patrakov" Cc: linux-kernel@vger.kernel.org Subject: Re: linux-3.7.1: disable and reenable NMI watchdog => panic Message-ID: <20130111133422.GA21882@liondog.tnic> Mail-Followup-To: Borislav Petkov , "Alexander E. Patrakov" , linux-kernel@vger.kernel.org References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: 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 Sun, Jan 06, 2013 at 11:53:41PM +0600, Alexander E. Patrakov wrote: > As illustrated by the screen photo [1] (sorry for bad quality), > disabling and then reenabling the NMI watchdog panics the kernel > (3.7.1). This is reproducible in qemu-kvm as well, but I could not get > the nice panic message to pop up there (most of the time, the real > machine just locks up, too). This bug is rather important, as > laptop-mode-tools, by default, try to reenable this NMI watchdog when > AC power appears, and this is how I caught the bug the first time. > > [1] http://postimage.org/image/mjjifj1ip/ http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=3935e89505a1c3ab3f3b0c7ef0eae54124f48905 should fix it. See also thread here: http://marc.info/?i=20130109120732.GA8016@liondog.tnic HTH. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --