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 0DED3C433E0 for ; Wed, 27 May 2020 17:08:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DF31C20873 for ; Wed, 27 May 2020 17:08:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729772AbgE0RIS (ORCPT ); Wed, 27 May 2020 13:08:18 -0400 Received: from mga02.intel.com ([134.134.136.20]:24714 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726767AbgE0RIR (ORCPT ); Wed, 27 May 2020 13:08:17 -0400 IronPort-SDR: 4RypG239s4ykV/TPrMOD2E6bLZM6tKwPHizrqAshjKC+lYZgA/WixNZ5NaUFs9eJMK9ypgsLH8 lkFBG0G5BNxA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2020 10:06:13 -0700 IronPort-SDR: eXcf5DjvIgIvmCd3FZhCi3GvS7LhmuToG8rM/iNhyd+XIRI5fZy2Bhusu9VMUX8I4fZ1d0zwiF tqdj7avK+8DQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,442,1583222400"; d="scan'208";a="414277949" Received: from sjchrist-coffee.jf.intel.com (HELO linux.intel.com) ([10.54.74.152]) by orsmga004.jf.intel.com with ESMTP; 27 May 2020 10:06:13 -0700 Date: Wed, 27 May 2020 10:06:13 -0700 From: Sean Christopherson To: Paolo Bonzini Cc: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+904752567107eefb728c@syzkaller.appspotmail.com Subject: Re: [PATCH] KVM: x86: Initialize tdp_level during vCPU creation Message-ID: <20200527170612.GA24930@linux.intel.com> References: <20200527085400.23759-1-sean.j.christopherson@intel.com> <40800163-2b28-9879-f21b-687f89070c91@redhat.com> <20200527162933.GE24461@linux.intel.com> <078365dd-64ff-4f3c-813c-3d9fc955ed1a@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <078365dd-64ff-4f3c-813c-3d9fc955ed1a@redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 27, 2020 at 06:56:19PM +0200, Paolo Bonzini wrote: > On 27/05/20 18:29, Sean Christopherson wrote: > > Ya. syzbot is hitting a #GP due to NULL pointer during debugfs on the exact > > same sequence. I haven't been able to reproduce that one (have yet to try > > syzbot's exact config), but it's another example of a "dumb" test hitting > > meaningful bugs. > > Saw that, it's mine. :) All yours. I as hoping it would be easily reproducible and fixable while I was looking at the MMU BUG(), but that didn't happen.