From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752109AbbBSQ5p (ORCPT ); Thu, 19 Feb 2015 11:57:45 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:58454 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751783AbbBSQ5o (ORCPT ); Thu, 19 Feb 2015 11:57:44 -0500 Date: Thu, 19 Feb 2015 17:57:32 +0100 From: Peter Zijlstra To: Vince Weaver Cc: linux-kernel@vger.kernel.org, Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo , Jiri Olsa , Steven Rostedt Subject: Re: perf: fuzzer gets CPU stuck in perf_callchain() Message-ID: <20150219165732.GG21418@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/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 19, 2015 at 11:54:40AM -0500, Vince Weaver wrote: > > Another bug found by the perf_fuzzer(). I think this one is different > than the one I sent the other day, it looks like something is going > very wrong in perf_callchain(). > > This one is reasonably reproducible, if there's any extra debugging that I > can add. This is on a Haswell machine with git as of a few days ago. Aw man, and I had such good hopes with you saying it took 4 days to find problems :/ I'll try and get some time to stare at both.