From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753383AbaJGIRr (ORCPT ); Tue, 7 Oct 2014 04:17:47 -0400 Received: from casper.infradead.org ([85.118.1.10]:53738 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753180AbaJGIRn (ORCPT ); Tue, 7 Oct 2014 04:17:43 -0400 Date: Tue, 7 Oct 2014 10:17:32 +0200 From: Peter Zijlstra To: Fengguang Wu Cc: Jet Chen , Su Tao , Yuanhan Liu , LKP , linux-kernel@vger.kernel.org, Dave Jones Subject: Re: [perf] BUG: unable to handle kernel NULL pointer dereference at 00000085 Message-ID: <20141007081732.GF19379@twins.programming.kicks-ass.net> References: <20141004134622.GA5214@wfg-t540p.sh.intel.com> <20141004172456.GA7509@worktop.ger.corp.intel.com> <20141007050348.GB17972@wfg-t540p.sh.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20141007050348.GB17972@wfg-t540p.sh.intel.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 07, 2014 at 01:03:48PM +0800, Fengguang Wu wrote: > > What is lacking is the actual .config. > > Sorry, attached the .config. I expected the script to auto attach it, > but obviously it's not yet perfect and failed to attach .config in > this case. Sure no problem, just figured I'd tell you. > > Also the times above (~285 seconds) seem to suggest userspace needs to > > do something ? > > It's trinity. I'll try upgrade it, but it seems be valid for trinity > to feed kernel with any parameters that it can accept -- unless the > kernel completely rejects it one day. OK, does it make sense to augment that script you have with a trinity parameter? Maybe have that userspace read the kernel cmdline and also run trinity when observed? That way you can provide full reproduction environments, which it appears you're striving towards.