Received: by 2002:a05:6a10:22f:0:0:0:0 with SMTP id 15csp2856202pxk; Mon, 28 Sep 2020 01:40:05 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzvI6mqE0nqKQ+Dn4488sFcCo+szAJzwuXCBv1kFrUefKLabmUnCb1o6JyQR1VSlKccqiRO X-Received: by 2002:aa7:d68c:: with SMTP id d12mr529004edr.274.1601282405683; Mon, 28 Sep 2020 01:40:05 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1601282405; cv=none; d=google.com; s=arc-20160816; b=mr6I6Y674S8dmZMk2dx7TUwIM1bOMg2jSfO4CRCvI0wxGUJJx5D5bmtz7Ew/qaW3Bx clNInKo9TkgFNNLrMZwaQ/BWr52e47yQyjVu8vbNbogSWNy6qy7dOAPSRkGtQurHGwv2 VRcxfGy+mlUWVXkRfGOg+F1J71jZ2W+vnI0E43jBVqmVhdbYPvO5S0YAiNz1xQF4exLo XC4K9vWaM8XzP4qdat5cj52Ye+WhbXtSjbHo9YQM8ikwpHSGMlLea0qYajqhIPFURYgV r5Vys4vf5lxmwDSrABQcS3V/TrQBpBt5To08jJMjP91WFBIoyE5qJwO7irQiw9fD+E7c kLjw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=lfG0lfD82yy4p/0tbie5GchL7TDPEnApnyEmhZtA+0Y=; b=pkGwJp7RP0n4ZEKyzmPe7RzuPEfNeAtNoNJuLRkmGAE9NFypaOCkz62dEsavFwuJCU G59q/+m8M3Pb940H3GAR9iluc7T5d+ekocXCVEv27R0bz9pGQ3cOO7AKy0Ub7LdFz8jI iYerJJXjkvYlv0dJ2xkwkQmgaAv/Et5T9Hc8jqI1sJ2+QMGoGI/4I41rqOlcD6caI0dQ V5A6kjF7CzZMAGxzMMqekpqZQAjUnFxO4TVxZ7tJp99/kbOmi7zXhVsB56xneg5ojK+S ucgwdiSlx+chqPP/D9DPZ3VuWvLsb1CtRY184Qt9yqkQh7iSGnWb1wv01iNIcjZDxE+y xs5w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b=elzncUXu; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id e14si169423edm.126.2020.09.28.01.39.43; Mon, 28 Sep 2020 01:40:05 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b=elzncUXu; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726650AbgI1Ii0 (ORCPT + 99 others); Mon, 28 Sep 2020 04:38:26 -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