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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, 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 449E2C35646 for ; Fri, 21 Feb 2020 16:27:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 213F120578 for ; Fri, 21 Feb 2020 16:27:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726856AbgBUQ1d (ORCPT ); Fri, 21 Feb 2020 11:27:33 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:46250 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725995AbgBUQ1c (ORCPT ); Fri, 21 Feb 2020 11:27:32 -0500 Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1j5B9B-00069p-JK; Fri, 21 Feb 2020 17:27:25 +0100 Received: by nanos.tec.linutronix.de (Postfix, from userid 1000) id E5D2D100EA2; Fri, 21 Feb 2020 17:27:24 +0100 (CET) From: Thomas Gleixner To: Paul Menzel , Ingo Molnar , Borislav Petkov Cc: "x86\@kernel.org" , LKML , it+linux-x86@molgen.mpg.de Subject: Re: kernel BUG at arch/x86/kernel/apic/apic.c with Dell server with x2APIC enabled and unset X2APIC In-Reply-To: References: Date: Fri, 21 Feb 2020 17:27:24 +0100 Message-ID: <87imjzoqhf.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Paul, Paul Menzel writes: > > On the Dell PowerEdge T640/04WYPY, BIOS 2.4.8 11/27/2019, Linux 5.4.14 (and 4.19.57) with > unset `IRQ_REMAP` and `X86_X2APIC` crashes on start-up, when x2APIC is enabled in the > firmware. > [ 3.883893] Switched APIC routing to physical flat. > [ 3.888904] ------------[ cut here ]------------ > [ 3.893641] kernel BUG at arch/x86/kernel/apic/apic.c:1616! So the APIC is not registered. > > `noapic` and `acpi=off` separately did not work, but `noapic acpi=off` hit the other > panic. I have no idea what you are talking about. Which command line options are set to reproduce the above? Also please test the latest stable kernels not some random ones. Thanks, tglx