From patchwork Thu Dec 28 17:44:56 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 10135415 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5869760212 for ; Thu, 28 Dec 2017 17:45:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4624B2D894 for ; Thu, 28 Dec 2017 17:45:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 39B182D916; Thu, 28 Dec 2017 17:45:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CF4932D894 for ; Thu, 28 Dec 2017 17:45:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754961AbdL1RpD (ORCPT ); Thu, 28 Dec 2017 12:45:03 -0500 Received: from Galois.linutronix.de ([146.0.238.70]:33157 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754390AbdL1RpB (ORCPT ); Thu, 28 Dec 2017 12:45:01 -0500 Received: from p4fea5f09.dip0.t-ipconnect.de ([79.234.95.9] helo=nanos) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1eUcCq-0007Qs-Nx; Thu, 28 Dec 2017 18:43:00 +0100 Date: Thu, 28 Dec 2017 18:44:56 +0100 (CET) From: Thomas Gleixner To: Andy Shevchenko cc: "alan@linux.intel.com" , "Ailus, Sakari" , "linux-kernel@vger.kernel.org" , "linux-media@vger.kernel.org" Subject: Re: IRQ behaivour has been changed from v4.14 to v4.15-rc1 In-Reply-To: <1514482448.7000.460.camel@linux.intel.com> Message-ID: References: <1514481444.7000.451.camel@intel.com> <1514482448.7000.460.camel@linux.intel.com> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 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-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On Thu, 28 Dec 2017, Andy Shevchenko wrote: > On Thu, 2017-12-28 at 18:21 +0100, Thomas Gleixner wrote: > > > [ 85.167061] spurious APIC interrupt through vector ff on CPU#0, > > > should never happen. > > > [ 85.199886] atomisp-isp2 0000:00:03.0: stream[0] started. > > > > > > and Ctrl+C does NOT work. Machine just hangs. > > > > > > It might be related to this: > > > https://lkml.org/lkml/2017/12/22/697 > > > > I don't think so. > > > > Does the patch below cure it? > > Unfortunately, no. > > Same behaviour. > > Tell me if I need to provide some debug before it hangs. For now I have > apic=debug (AFAIR it doesn't affect this). The interesting question is why that spurious APIC interrupt through vector ff happens. Can you please add the following to the kernel command line: 'trace_events=irq_vectors:* ftrace_dump_on_oops' and apply the patch below. That should spill out the trace over serial (I hope you have that ...) Thanks, tglx 8<--------------- --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1978,6 +1978,8 @@ void __init register_lapic_address(unsig /* see sw-dev-man vol 3, chapter 7.4.13.5 */ pr_info("spurious APIC interrupt through vector %02x on CPU#%d, " "should never happen.\n", vector, smp_processor_id()); + tracing_off(); + BUG(); trace_spurious_apic_exit(vector); exiting_irq();