From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752363AbcHHSaj (ORCPT ); Mon, 8 Aug 2016 14:30:39 -0400 Received: from merlin.infradead.org ([205.233.59.134]:56788 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752224AbcHHSai (ORCPT ); Mon, 8 Aug 2016 14:30:38 -0400 Date: Mon, 8 Aug 2016 20:30:33 +0200 From: Peter Zijlstra To: Vince Weaver Cc: linux-kernel@vger.kernel.org, Ingo Molnar , Arnaldo Carvalho de Melo Subject: Re: perf: hard fuzzer crash on 4.8-rc1 Message-ID: <20160808183033.GA30192@twins.programming.kicks-ass.net> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 08, 2016 at 01:57:28PM -0400, Vince Weaver wrote: > Hello > > I've finally had time to get the perf_fuzzer going on a 4.8-rc1 kernel on > a Haswell machine. > > It locks up pretty quickly, I even have a marginally reproducible test case. > The problem is the serial console only prints the following before giving > up: > > [ 637.250130] BUG: unable to handle kernel > > About 10 times of triggering this, this is all I get. Machine is fairly > thoroughly locked at that point. > > Any advice on how to debug this more? I have this pending: lkml.kernel.org/r/20160804123724.GN6862@twins.programming.kicks-ass.net If that's not it, I'll go prod tomorrow.