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=-1.0 required=3.0 tests=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 69687C4332B for ; Sun, 22 Mar 2020 18:58:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 38C9120781 for ; Sun, 22 Mar 2020 18:58:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726666AbgCVS6m convert rfc822-to-8bit (ORCPT ); Sun, 22 Mar 2020 14:58:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:50106 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725881AbgCVS6m (ORCPT ); Sun, 22 Mar 2020 14:58:42 -0400 From: bugzilla-daemon@bugzilla.kernel.org To: kvm@vger.kernel.org Subject: [Bug 206579] KVM with passthrough generates "BUG: kernel NULL pointer dereference" and crashes Date: Sun, 22 Mar 2020 18:58:40 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Product: Virtualization X-Bugzilla-Component: kvm X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: rmuncrief@humanavance.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: attachments.created Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=206579 --- Comment #47 from muncrief (rmuncrief@humanavance.com) --- Created attachment 288009 --> https://bugzilla.kernel.org/attachment.cgi?id=288009&action=edit dmesg output with latest patches from Comment 46 I'm glad to see people are still working on this bug, but unfortunately the patches from Comment 46 don't change anything on my system. I still get the same warning messages numerous times about the "is running" bit. And it still comes from this same instruction in svm.c : ``` WARN_ON(entry & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK); ``` I'm running 5.6-rc6, and the first patch was already in the code, so I just added the trace patch for completeness. Then I rebooted and immediately ran my VM and have attached the full dmesg output just in case there's something unusual going on in my system that you might recognize. Let me know if there's anything else I can do to help. I'd given up on this bug because the several fixes I tried didn't work, and then I didn't see any activity here so I began to wonder if the warnings were unimportant. But as I said before they sure make the dmesg output look alarming, and it would be nice to get rid of them even if they aren't significant. I guess I could just comment out the line if worse comes to worse though. -- You are receiving this mail because: You are watching the assignee of the bug.