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 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 5BF18C11D3D for ; Thu, 27 Feb 2020 20:50:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 24F4C246A0 for ; Thu, 27 Feb 2020 20:50:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729609AbgB0Uue convert rfc822-to-8bit (ORCPT ); Thu, 27 Feb 2020 15:50:34 -0500 Received: from mail.kernel.org ([198.145.29.99]:39806 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726758AbgB0Uue (ORCPT ); Thu, 27 Feb 2020 15:50:34 -0500 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: Thu, 27 Feb 2020 20:50:32 +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 #27 from muncrief (rmuncrief@humanavance.com) --- Created attachment 287667 --> https://bugzilla.kernel.org/attachment.cgi?id=287667&action=edit avic_inhibit_reasons debug information Oh, that was so cool Suravee! I applied the initial svm.c and debug patch and tested both host-passthrough and EPYC-IBPB configurations, and avic failed with both. With host-passthrough the avic_inhibit_reasons value immediately changed from 0 to 20, and then a few seconds later changed to 28. With the EPYC-IBPB the avic_inhibit_reasons value immediately changed from 0 to 16, and then a few seconds later changed to 24. I wanted to give you as much accurate information as possible so I attached the avic_inhibit_reason values, my physical machine and domain capabilities, and the command lines and XML files used in the tests for each configuration to this comment. By the way, I ran multiple tests with both configurations. I used the defaults, then explicit 1-8-2 topology, and with host-passthrough I removed the cache passthrough and VM hiding. I also ran all tests again using the second variation of the svm.c patch. Unfortunately nothing changed the avic failure though. I hope this information helps, and am looking forward to assisting you gentlemen further in any way possible. -- You are receiving this mail because: You are watching the assignee of the bug.