Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753220AbaGaX7t (ORCPT ); Thu, 31 Jul 2014 19:59:49 -0400 Received: from mga14.intel.com ([192.55.52.115]:26746 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751132AbaGaX7s (ORCPT ); Thu, 31 Jul 2014 19:59:48 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,775,1400050800"; d="scan'208";a="570225963" Date: Fri, 1 Aug 2014 07:59:42 +0800 From: Fengguang Wu To: Stephane Eranian Cc: Ingo Molnar , Jet Chen , Su Tao , Yuanhan Liu , LKP , LKML , Venkatesh Srinivas Subject: Re: [perf/x86/RAPL] BUG: unable to handle kernel NULL pointer dereference at 00000028 Message-ID: <20140731235942.GA5635@localhost> References: <20140730040008.GF16537@localhost> <20140730055333.GA29881@localhost> <20140731023233.GA1259@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 31, 2014 at 07:57:25PM +0200, Stephane Eranian wrote: > On Thu, Jul 31, 2014 at 4:32 AM, Fengguang Wu wrote: > > Hi Stephane, > > > > On Wed, Jul 30, 2014 at 07:56:11PM +0200, Stephane Eranian wrote: > >> On Wed, Jul 30, 2014 at 7:53 AM, Fengguang Wu wrote: > >> > On Wed, Jul 30, 2014 at 06:45:58AM +0200, Stephane Eranian wrote: > >> >> On Wed, Jul 30, 2014 at 6:00 AM, Fengguang Wu wrote: > >> >> > Greetings, > >> >> > > >> >> > 0day kernel testing robot got the below dmesg and the first bad commit is > >> >> > > >> >> Is this booting a guest kernel or native? > >> > > >> > It's a guest kernel. > >> > > >> >> What is the host CPU? > >> > > >> > The host CPU is E5-2680, Sandy Bridge-EP. > >> > > >> I thought this problem had already be mentioned a while back. > >> > >> See https://lkml.org/lkml/2014/3/6/685 > >> And https://lkml.org/lkml/2014/4/23/512 > >> > >> So what you are telling here is that those two fixes never made it or > >> that you are > >> running an older kernel. > > > > I just checked linux-next and find that the bug in rapl_pmu_init() has > > been fixed. linux-next happen to have the same "BUG: unable to handle > > kernel NULL pointer dereference" message but at another function > > validate_chain().. Attached is the dmesg in linux-next. > > > > Sorry for the noise! > > > Is it fixed with the two patches I referred you to? Yes. Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/