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=-10.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 BACA3C433DB for ; Wed, 24 Feb 2021 12:28:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6885164ED3 for ; Wed, 24 Feb 2021 12:28:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234622AbhBXM2B (ORCPT ); Wed, 24 Feb 2021 07:28:01 -0500 Received: from mail.skyhub.de ([5.9.137.197]:54080 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233576AbhBXM1z (ORCPT ); Wed, 24 Feb 2021 07:27:55 -0500 Received: from zn.tnic (p200300ec2f0d18008b247b078bad9a72.dip0.t-ipconnect.de [IPv6:2003:ec:2f0d:1800:8b24:7b07:8bad:9a72]) (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 C29331EC026D; Wed, 24 Feb 2021 13:27:12 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1614169632; 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=M5+WPT6nlnouK7l+/mNJ2w4w6/uAxYuT5kmxmJdTrr8=; b=Bh9v/pSs45AhY7FHbXtE6kMBWaXUyiyLPh6m+VmffZT9J/uY1S3B8646j7EZh3TCT/nqif o9qnHs0SEoo0N6ezBOCq1jupROaDgALvEViKXWMWpBkFtM09TyANDkym0h76IGNNvIFM8T Flc9DrovFcGIpMmR9lY37tnfodMsVL0= Date: Wed, 24 Feb 2021 13:27:10 +0100 From: Borislav Petkov To: syzbot Cc: dave.hansen@intel.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, kirill.shutemov@linux.intel.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, lstoakes@gmail.com, mingo@redhat.com, pbonzini@redhat.com, seanjc@google.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org Subject: Re: general protection fault in vmx_vcpu_run (2) Message-ID: <20210224122710.GB20344@zn.tnic> References: <0000000000007ff56205ba985b60@google.com> <00000000000004e7d105bc091e06@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <00000000000004e7d105bc091e06@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 23, 2021 at 03:17:07PM -0800, syzbot wrote: > syzbot has bisected this issue to: > > commit 167dcfc08b0b1f964ea95d410aa496fd78adf475 > Author: Lorenzo Stoakes > Date: Tue Dec 15 20:56:41 2020 +0000 > > x86/mm: Increase pgt_buf size for 5-level page tables > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13fe3ea8d00000 > start commit: a99163e9 Merge tag 'devicetree-for-5.12' of git://git.kern.. > git tree: upstream > final oops: https://syzkaller.appspot.com/x/report.txt?x=10013ea8d00000 No oops here. > console output: https://syzkaller.appspot.com/x/log.txt?x=17fe3ea8d00000 Nothing special here too. > kernel config: https://syzkaller.appspot.com/x/.config?x=49116074dd53b631 Tried this on two boxes, the Intel one doesn't even boot with that config - and it is pretty standard one - and on the AMD one the reproducer doesn't trigger anything. It probably won't because the GP is in vmx_vcpu_run() but since the ioctls were doing something with IRQCHIP, I thought it is probably vendor-agnostic. So, all in all, I could use some more info on how you're reproducing and maybe you could show the oops too. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette