From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752247AbcGMHTk (ORCPT ); Wed, 13 Jul 2016 03:19:40 -0400 Received: from smtp2.it.da.ut.ee ([193.40.5.67]:35544 "EHLO smtp2.it.da.ut.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751293AbcGMHTb (ORCPT ); Wed, 13 Jul 2016 03:19:31 -0400 Date: Wed, 13 Jul 2016 10:21:27 +0300 (EEST) From: Meelis Roos To: "Rafael J. Wysocki" cc: Linux Kernel list , Len Brown , linux-pm@vger.kernel.org Subject: Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6 In-Reply-To: Message-ID: References: <5630546.0MIYeGNSYG@vostro.rjw.lan> User-Agent: Alpine 2.20 (LRH 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > > > On HP Proliant DL360 G6, Debian unstable 4.6 kernel runs fine but > > > > selfcompiled 4.7-rc6 and 4.7-rc7 sometimes crash with NMI from > > > > intel_idle. Sometimes it boots fine. With intel_idle disabled, it has > > > > booted successful so far in 2 tries, one with rc6 and one with rc7. > > > > > > More testing shows it can NMI on acpi_idle too, not just intel_idle. > > > > > > > Screenshot with some backtrace: > > > > http://kodu.ut.ee/~mroos/intel-idle-NMI.png > > > > > > http://kodu.ut.ee/~mroos/acpi-idle-NMI.png > > > > There were almost no changes in the ACPI idle driver between 4.6 and > > 4.7-rc, so the reason is somewhere else. > > > > Have you tried any earlier 4.7-rc? > > I tried selfcompiled 4.6.0 now with the same conf that 4.7-rc's have and > after multiple tries I got the same NMI out of 4.6 too, from kernfs > lookup (that seems to just a random victim). > > So this is not a 4.7 regression and probably not idle-releated. Confirmed this is about IOMMU+DMAR, I'm continuing in another reply thread with other CC-s to not bother linux-pm people with it. -- Meelis Roos (mroos@linux.ee)