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=-5.7 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,URIBL_BLOCKED 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 BB0B6C433DB for ; Wed, 24 Feb 2021 17:50:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 712F264E83 for ; Wed, 24 Feb 2021 17:50:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233440AbhBXRuh (ORCPT ); Wed, 24 Feb 2021 12:50:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42296 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229644AbhBXRuZ (ORCPT ); Wed, 24 Feb 2021 12:50:25 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9E42FC061786; Wed, 24 Feb 2021 09:49:45 -0800 (PST) Received: from zn.tnic (p200300ec2f0d18008c044bec5d14e7fe.dip0.t-ipconnect.de [IPv6:2003:ec:2f0d:1800:8c04:4bec:5d14:e7fe]) (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 6A99C1EC0531; Wed, 24 Feb 2021 18:49:41 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1614188981; 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=UnSGBFPmpQGqlrhDmBc2nnYtZYpR52FfmiTAsW6NcAQ=; b=D4lTT1hsfeIzIWYgO4MpDODdZ65bEVmsbDLPCzfmXS5nQt5MeHGGfmF34wEoTJkZWEHTqY FUGRlY+2bH6Pq753tiPOh7qFVa0AsgpJ1FFwctpwaC2by/MbxgY2ychRmLKXOAat7sWlYt GBqtFb5Ii9JBcNcc3lfMIdF+igj5pm8= Date: Wed, 24 Feb 2021 18:49:36 +0100 From: Borislav Petkov To: Dmitry Vyukov Cc: syzbot , Dave Hansen , "H. Peter Anvin" , Jim Mattson , Joerg Roedel , "Kirill A. Shutemov" , KVM list , LKML , Lorenzo Stoakes , Ingo Molnar , Paolo Bonzini , seanjc@google.com, syzkaller-bugs , Thomas Gleixner , Vitaly Kuznetsov , wanpengli@tencent.com, the arch/x86 maintainers Subject: Re: general protection fault in vmx_vcpu_run (2) Message-ID: <20210224174936.GG20344@zn.tnic> References: <0000000000007ff56205ba985b60@google.com> <00000000000004e7d105bc091e06@google.com> <20210224122710.GB20344@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 Hi Dmitry, On Wed, Feb 24, 2021 at 06:12:57PM +0100, Dmitry Vyukov wrote: > Looking at the bisection log, the bisection was distracted by something else. Meaning the bisection result: 167dcfc08b0b ("x86/mm: Increase pgt_buf size for 5-level page tables") is bogus? > You can always find the original reported issue over the dashboard link: > https://syzkaller.appspot.com/bug?extid=42a71c84ef04577f1aef > or on lore: > https://lore.kernel.org/lkml/0000000000007ff56205ba985b60@google.com/ Ok, so this looks like this is trying to run kvm ioctls *in* a guest, i.e., nested. Right? Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette