From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751995AbaIJOCe (ORCPT ); Wed, 10 Sep 2014 10:02:34 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:17224 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750935AbaIJOCc (ORCPT ); Wed, 10 Sep 2014 10:02:32 -0400 Message-ID: <541059C9.1040200@oracle.com> Date: Wed, 10 Sep 2014 10:01:45 -0400 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 MIME-Version: 1.0 To: Vince Weaver , Peter Zijlstra CC: linux-kernel@vger.kernel.org, Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo , Steven Rostedt Subject: Re: perf: perf_fuzzer triggers instant reboot References: <20140908185115.GI6758@twins.programming.kicks-ass.net> <20140910083136.GP6758@twins.programming.kicks-ass.net> In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/10/2014 09:18 AM, Vince Weaver wrote: > that's what got me looking at things again, the trinity reports. Though I > think those involve CPU hotplugging which my fuzzer shouldn't trigger. > > I do think this is the same memory corruption/reboot bug that I reported > back in February (the thread is "perf_fuzzer compiled for x32 causes > reboot" but I wasn't able to isolate the problem then either. > > Somehow something is stomping over memory with a forking workload (likely > an improper free with RCU like we've seen before) but the fact that it > causes a reboot immediately makes it *really* hard to debug this. Could this be http://permalink.gmane.org/gmane.linux.kernel/1779436 which I saw couple days ago? Thanks, Sasha