From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 35D8FC43603 for ; Wed, 4 Dec 2019 19:47:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 076542073C for ; Wed, 4 Dec 2019 19:47:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728145AbfLDTrU (ORCPT ); Wed, 4 Dec 2019 14:47:20 -0500 Received: from mx2.cyber.ee ([193.40.6.72]:33266 "EHLO mx2.cyber.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727978AbfLDTrU (ORCPT ); Wed, 4 Dec 2019 14:47:20 -0500 Subject: Re: UBSAN: Undefined behaviour in arch/x86/events/intel/p6.c:116:29 To: Peter Zijlstra , Jiri Olsa Cc: LKML , x86@kernel.org, Arnaldo Carvalho de Melo , Jiri Olsa , Ingo Molnar , Mark Rutland References: <02f44ed5-13ac-f9c6-1f35-129c41006900@linux.ee> <20191202170633.GN2844@hirez.programming.kicks-ass.net> <0676c6ec-4475-62dc-b202-a62deaedd2dd@linux.ee> <20191204121540.GE20746@krava> <20191204150656.GX2844@hirez.programming.kicks-ass.net> From: Meelis Roos Message-ID: <4ee9ffee-4f04-dec0-c4e8-244993eb8111@linux.ee> Date: Wed, 4 Dec 2019 21:47:31 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20191204150656.GX2844@hirez.programming.kicks-ass.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 04.12.19 17:06 Peter Zijlstra wrote: > On Wed, Dec 04, 2019 at 01:15:40PM +0100, Jiri Olsa wrote: >> On Tue, Dec 03, 2019 at 03:39:49PM +0200, Meelis Roos wrote: >>>> Does something like so fix it? >>> >>> Unfortunately not (tested on top of todays git): >> >> hi, >> which p6 model are you seeing this on? >> how do you trigger that? > > Triggers on any p6 model. I hacked up perf and used "qemu-system-x86_64 > -cpu pentium2". > > The below seems to cure things. Yes, works for me on Pentium M. The UBSAN warning is gone and everything seems to work as before. Thank you! -- Meelis Roos