Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932705AbeAKU5K (ORCPT + 1 other); Thu, 11 Jan 2018 15:57:10 -0500 Received: from merlin.infradead.org ([205.233.59.134]:41874 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932419AbeAKU5J (ORCPT ); Thu, 11 Jan 2018 15:57:09 -0500 Date: Thu, 11 Jan 2018 21:57:00 +0100 From: Peter Zijlstra To: Vince Weaver Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Ingo Molnar , Arnaldo Carvalho de Melo , Thomas Gleixner Subject: Re: perf: perf_fuzzer quickly locks up on 4.15-rc7 Message-ID: <20180111205700.GG3397@worktop> References: <20180111091353.GW6176@hirez.programming.kicks-ass.net> <20180111153845.GD6176@hirez.programming.kicks-ass.net> <20180111170347.GG6176@hirez.programming.kicks-ass.net> <20180111191125.GG2369@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22.1 (2013-10-16) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Thu, Jan 11, 2018 at 03:40:44PM -0500, Vince Weaver wrote: > On Thu, 11 Jan 2018, Vince Weaver wrote: > > > Not sure if this info helps, but if I make perf_fuzzer *not* create AUX > > mmap() buffers, I'm unable to reproduce the hangs both on core2 and > > haswell. > > Confirmed, I can crash the system without the fuzzer, just by doing > > perf record --per-thread -e intel_bts// /bin/ls > > on my haswell system. It makes my IVB very ill, starts spewing RCU stall warnings, but is otherwise very unresponsive. Awesome... I'll prod at it when my brain works again.