Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752387Ab3GAPHe (ORCPT ); Mon, 1 Jul 2013 11:07:34 -0400 Received: from mail-gh0-f182.google.com ([209.85.160.182]:53864 "EHLO mail-gh0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750878Ab3GAPHb (ORCPT ); Mon, 1 Jul 2013 11:07:31 -0400 Date: Mon, 1 Jul 2013 11:13:01 -0400 (EDT) From: Vince Weaver To: Peter Zijlstra cc: Vince Weaver , linux-kernel@vger.kernel.org, Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo , trinity@vger.kernel.org Subject: Re: [testcase] perf: yet another fuzzer triggered crash In-Reply-To: <20130701090713.GO6626@twins.programming.kicks-ass.net> Message-ID: References: <20130701090713.GO6626@twins.programming.kicks-ass.net> User-Agent: Alpine 2.10 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 721 Lines: 21 On Mon, 1 Jul 2013, Peter Zijlstra wrote: > OK, so on my westmere it triggers that WARN in task_ctx_sched_out() a > _lot_ (I removed the ONCE for easier debugging earlier -- still kinda > stumped there). > > Then this thing causes an RCU stall and starts triggering NMI watchdog > msgs.. so YAY! :-) I'm glad it's not just me. I'm in the process of kernel bisecting this, though all I can tell you so far is 2.6.32 is unaffected by the bug but 3.2 and later are. Vince -- 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/