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=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 96073C2D0A8 for ; Mon, 28 Sep 2020 08:38:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 058E6207E8 for ; Mon, 28 Sep 2020 08:38:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="elzncUXu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726672AbgI1Ii1 (ORCPT ); Mon, 28 Sep 2020 04:38:27 -0400 Received: from mail.skyhub.de ([5.9.137.197]:53856 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726526AbgI1IiW (ORCPT ); Mon, 28 Sep 2020 04:38:22 -0400 Received: from zn.tnic (p200300ec2f072200afd3fa405d8d6d26.dip0.t-ipconnect.de [IPv6:2003:ec:2f07:2200:afd3:fa40:5d8d:6d26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 26C7D1EC0179; Mon, 28 Sep 2020 10:38:21 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1601282301; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=lfG0lfD82yy4p/0tbie5GchL7TDPEnApnyEmhZtA+0Y=; b=elzncUXuEWJR/VkccDC2/KcKOv0Vr6hCDQjwQX9iGMtjwhLnWM0qpvLKi8ope+TsA5JIEC GIYU+MJv02aLmZnoxOqZs+hhTn40WX35+rApuBXYAlMRhlxY+7sjx76EmaRmZCW1kvehzv 0D1izpU+CeLJ1k+yZ3EP37zbM6mzsqE= Date: Mon, 28 Sep 2020 10:38:19 +0200 From: Borislav Petkov To: Dmitry Vyukov Cc: Alexander Potapenko , Marco Elver , syzbot , Arnaldo Carvalho de Melo , Alexander Shishkin , "H. Peter Anvin" , Jiri Olsa , LKML , Mark Rutland , Ingo Molnar , Namhyung Kim , Peter Zijlstra , syzkaller-bugs , Thomas Gleixner , the arch/x86 maintainers , clang-built-linux Subject: Re: general protection fault in perf_misc_flags Message-ID: <20200928083819.GD1685@zn.tnic> References: <00000000000052569205afa67426@google.com> <20200927145737.GA4746@zn.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 28, 2020 at 08:06:19AM +0200, Dmitry Vyukov wrote: > Maybe it's just a random silent memory corruption in the end?... Oh, the rabbit hole goes deeper. But if it is corruption, what is the common element in all those? All those guests have run on the same physical machine? If so, you probably won't get any logs from it to search for MCEs or so...? Maybe the GCE people can do some grepping :) -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette