From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753969AbcEXNqM (ORCPT ); Tue, 24 May 2016 09:46:12 -0400 Received: from www.linutronix.de ([62.245.132.108]:36396 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751254AbcEXNqL (ORCPT ); Tue, 24 May 2016 09:46:11 -0400 Date: Tue, 24 May 2016 15:44:21 +0200 (CEST) From: Thomas Gleixner To: Wanpeng Li cc: "linux-kernel@vger.kernel.org" Subject: Re: modify_irte NULL pointer In-Reply-To: Message-ID: References: User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII 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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 22 May 2016, Wanpeng Li wrote: > [ 39.977778] BUG: unable to handle kernel NULL pointer dereference > at (null) > [ 39.988494] IP: [] modify_irte+0x58/0x140 > [ 39.996939] PGD cede3067 PUD 2d790067 PMD 0 > [ 40.004087] Oops: 0000 [#1] SMP > > This can be reproduced by adding noapic boot parameter. Hmm. We should not have MSIs and such if apic is disabled. I'll have a look. Thanks, tglx