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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham 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 22414C04AA7 for ; Mon, 13 May 2019 14:07:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F133320862 for ; Mon, 13 May 2019 14:07:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730445AbfEMOHR (ORCPT ); Mon, 13 May 2019 10:07:17 -0400 Received: from mga02.intel.com ([134.134.136.20]:33097 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728500AbfEMOHQ (ORCPT ); Mon, 13 May 2019 10:07:16 -0400 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 May 2019 07:07:16 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,465,1549958400"; d="scan'208";a="171201036" Received: from sjchrist-coffee.jf.intel.com (HELO linux.intel.com) ([10.54.74.36]) by fmsmga002.fm.intel.com with ESMTP; 13 May 2019 07:07:15 -0700 Date: Mon, 13 May 2019 07:07:15 -0700 From: Sean Christopherson To: Marc Haber Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Linux in KVM guest segfaults when hosts runs Linux 5.1 Message-ID: <20190513140715.GB28561@linux.intel.com> References: <20190512115302.GM3835@torres.zugschlus.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190512115302.GM3835@torres.zugschlus.de> 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 Sun, May 12, 2019 at 01:53:02PM +0200, Marc Haber wrote: > Hi, > > since updating my home desktop machine to kernel 5.1.1, KVM guests > started on that machine segfault after booting: > general protection fault: 0000 [#1] PREEMPT SMP NOPTI > CPU: 0 PID: 13 Comm: kworker/0:1 Not tainted 5.0.13-zgsrv20080 #5.0.13.20190505.0 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 > Workqueue: events once_deferred > RIP: 0010:native_read_pmc+0x2/0x10 > Code: e2 20 89 3e 48 09 d0 c3 89 f9 89 f0 0f 30 c3 66 0f 1f 84 00 00 00 00 00 89 f0 89 f9 0f 30 31 c0 c3 0f 1f 80 00 00 00 00 89 f9 <0f> 33 48 c1 e2 20 48 09 d0 c3 0f 1f 40 00 0f 20 c0 c3 66 66 2e 0f > RSP: 0018:ffff8881b9a03e50 EFLAGS: 00010083 > RAX: 0000000000000001 RBX: ffff800000000001 RCX: 0000000000000000 > RDX: 000000000000002f RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffff8881b590e400 R08: ffff8881b590e400 R09: 0000000000000003 > R10: ffffe8ffffc05440 R11: 0000000000000000 R12: ffff8881b590e5d8 > R13: 0000000000000010 R14: ffff8881b590e420 R15: ffffe8ffffc05400 > FS: 0000000000000000(0000) GS:ffff8881b9a00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f9bcc5c61f8 CR3: 00000001b6a24000 CR4: 00000000000006f0 > Call Trace: > > x86_perf_event_update+0x3b/0x80 > x86_pmu_stop+0x84/0xa0 > x86_pmu_del+0x52/0x160 > event_sched_out.isra.59+0x95/0x190 > group_sched_out.part.61+0x51/0xc0 > ctx_sched_out+0xf2/0x220 > ctx_resched+0xb8/0xc0 > __perf_install_in_context+0x175/0x1f0 > remote_function+0x3e/0x50 > flush_smp_call_function_queue+0x30/0xe0 > smp_call_function_interrupt+0x2f/0x40 > call_function_single_interrupt+0xf/0x20 > ... > The host seems to be running fine, the KVM guest crash is reproducible. > Both host and guest are running Debian unstable with a locally built > kernel; the host runs 5.1.1, the guest 5.0.13. The crash also happens > when the host is running 5.1.0; going back to 5.0.13 with the host > allows the guest to finish bootup and run fine. > > Please note that my kernel 5.1.1 image is not fully broken in KVM, I > have update my APU machine which runs firewall and other infrastructure > services and the guests run fine there. > > The machine in question is an older box with an AMD Phenom(tm) II X6 > 1090T Processor. I guess that the issue is related to the Phenom CPU. > > Any idea short of bisecting? It's a regression introduced by commit 672ff6cff80c ("KVM: x86: Raise #GP when guest vCPU do not support PMU"). A fix has been submitted. https://lkml.kernel.org/r/20190508170248.15271-1-bp@alien8.de