From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751813AbeBZQOX (ORCPT ); Mon, 26 Feb 2018 11:14:23 -0500 Received: from mail-dm3nam03on0062.outbound.protection.outlook.com ([104.47.41.62]:24272 "EHLO NAM03-DM3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750757AbeBZQOV (ORCPT ); Mon, 26 Feb 2018 11:14:21 -0500 Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=Thomas.Lendacky@amd.com; Subject: Re: `do_IRQ: 1.55 No irq handler for vector` on ASRock E350M1 To: Thomas Gleixner , Paul Menzel Cc: Borislav Petkov , Paul Menzel , LKML References: <8bb6b660-ce08-37a7-d1ab-38a690595856@molgen.mpg.de> <20180223190950.GJ4981@pd.tnic> <61f2fc82-4eee-8678-c37a-dc300dde4edf@molgen.mpg.de> From: Tom Lendacky Message-ID: Date: Mon, 26 Feb 2018 10:14:10 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; 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The interrupt >>>> seems to come from BIOS/microcode during bringup of secondary CPUs and we >>>> have no idea why. >>> >>> Paul, can you boot 4.14 and grep your dmesg for something like: >>> >>> [ 0.000000] spurious 8259A interrupt: IRQ7. > >>> ? >> >> No, I do not see that. Please find the logs attached. > > From your 4.14 log: > > Feb 19 09:48:06.843173 kodi kernel: CPU 0 irqstacks, hard=e9b0a000 soft=e9b0c000 > Feb 19 09:48:06.843216 kodi kernel: spurious 8259A interrupt: IRQ7. I think I remember seeing something like this previously and it turned out to be a BIOS bug. All the AP's were enabled to work with the legacy 8259 interrupt controller. In an SMP system, only one processor in the system should be configured to handle legacy 8259 interrupts (ExtINT delivery mode - see Intel's SDM, Volume 3, section 10.5.1, Delivery Mode). Once the BIOS was fixed, the spurious interrupt message went away. I believe at some point during UEFI, the APs were exposed to an ExtINT interrupt. Since they were configured to handle ExtINT delivery mode and interrupts were not yet enabled, the interrupt was left pending. When the APs were started by the OS and interrupts were enabled, the interrupt triggered. Since the original pending interrupt was handled by the BSP, there was no longer an interrupt actually pending, so the 8259 responds with IRQ 7 when queried by the OS. This occurred for each AP. Thanks, Tom > Feb 19 09:48:06.843258 kodi kernel: Console: colour VGA+ 80x25 > > So this has been there in 4.14 already just the detection mechanism has > changed due to the modifications of the interrupt vector management code. > It's not a real issue, just annoying .... > > Thanks, > > tglx >