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_PASS 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 B7727ECDE5F for ; Thu, 19 Jul 2018 13:48:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 740B420673 for ; Thu, 19 Jul 2018 13:48:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 740B420673 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731707AbeGSObv (ORCPT ); Thu, 19 Jul 2018 10:31:51 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:33147 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730433AbeGSObv (ORCPT ); Thu, 19 Jul 2018 10:31:51 -0400 Received: from hsi-kbw-5-158-153-52.hsi19.kabel-badenwuerttemberg.de ([5.158.153.52] 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 1fg9IG-0000CX-0p; Thu, 19 Jul 2018 15:48:32 +0200 Date: Thu, 19 Jul 2018 15:48:31 +0200 (CEST) From: Thomas Gleixner To: Paul Menzel cc: Bjorn Helgaas , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Marc Zyngier Subject: Re: NULL pointer dereference in msi_set_mask_bit In-Reply-To: Message-ID: References: <20180718140636.GD128988@bhelgaas-glaptop.roam.corp.google.com> <6339fdef-a335-b833-4022-23725fd86d9e@molgen.mpg.de> <178bb701-56af-06cf-4836-1a26e74f2b07@molgen.mpg.de> <7660f2f2-0c37-a617-ecdc-949cd4ecc060@molgen.mpg.de> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Paul, On Thu, 19 Jul 2018, Paul Menzel wrote: > I had to copy the files, and then was able to create an archive with > non-zero files. Please find the tar archive attached. Thanks for providing the data. All looks normal there. Just for clarification. Did this happen exactly once, or did it just not happen again after you plugged in a serial cable? One thing you might try is to disable irqbalanced when the machine is up and then stress the affinity setter mechanism with scripting. Something like while true; do for I in {0..3}; do echo $I > /proc/irq/$IRQ/smp_affinity_list; done done might be able to trigger it. But don't ask me which interrupt was involved, so you have to iterate through the ones which are MSI based. 'cat /proc/interrupt | grep MSI' will tell you. Thanks, tglx