Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755634AbeAIRSb (ORCPT + 1 other); Tue, 9 Jan 2018 12:18:31 -0500 Received: from mail-io0-f193.google.com ([209.85.223.193]:44587 "EHLO mail-io0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752165AbeAIRS3 (ORCPT ); Tue, 9 Jan 2018 12:18:29 -0500 X-Google-Smtp-Source: ACJfBouEvMPmjksHs05pI72AIH1pj3pWauBB9gkx5Z1GVauZ4fKEFMsim28DemrZCBPmJLdFRVE7aQ== From: Vince Weaver X-Google-Original-From: Vince Weaver Date: Tue, 9 Jan 2018 12:18:26 -0500 (EST) X-X-Sender: vince@macbook-air To: Peter Zijlstra 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 In-Reply-To: <20180109153341.GL6176@hirez.programming.kicks-ass.net> Message-ID: References: <20180108173005.lkglqrixb2ota6g2@gmail.com> <20180109102507.GG6176@hirez.programming.kicks-ass.net> <20180109132602.GA2369@hirez.programming.kicks-ass.net> <20180109151253.GK6176@hirez.programming.kicks-ass.net> <20180109153341.GL6176@hirez.programming.kicks-ass.net> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) 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 Return-Path: I tried it again with your patch and force_early_printk, no luck. I can start dropping printks around the NMI code but I feel like I don't really know what I'm doing. Also I managed to hit (presumably) the same bug on a skylake machine. That one doesn't have a serial cable hooked up to it, I'll try to see if I can find one. I am running debian-unstable with gcc 7.2 if it makes a difference. Vince