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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 306B4C3F2D1 for ; Thu, 5 Mar 2020 12:12:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0B6C820658 for ; Thu, 5 Mar 2020 12:12:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726131AbgCEMMr (ORCPT ); Thu, 5 Mar 2020 07:12:47 -0500 Received: from foss.arm.com ([217.140.110.172]:47852 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725903AbgCEMMr (ORCPT ); Thu, 5 Mar 2020 07:12:47 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BEB9A4B2; Thu, 5 Mar 2020 04:12:46 -0800 (PST) Received: from [192.168.0.7] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E34463F6C4; Thu, 5 Mar 2020 04:12:45 -0800 (PST) Subject: Re: 5.6-rc3: WARNING: CPU: 48 PID: 17435 at kernel/sched/fair.c:380 enqueue_task_fair+0x328/0x440 To: Christian Borntraeger , Vincent Guittot Cc: Ingo Molnar , Peter Zijlstra , "linux-kernel@vger.kernel.org" References: <20200228163545.GA18662@vingu-book> <49a2ebb7-c80b-9e2b-4482-7f9ff938417d@de.ibm.com> <2108173c-beaa-6b84-1bc3-8f575fb95954@de.ibm.com> <7be92e79-731b-220d-b187-d38bde80ad16@arm.com> <805cbe05-2424-7d74-5e11-37712c189eb6@de.ibm.com> <20200305093003.GA32088@vingu-book> <15252de5-9a2d-19ae-607a-594ee88d1ba1@de.ibm.com> From: Dietmar Eggemann Message-ID: Date: Thu, 5 Mar 2020 13:12:39 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <15252de5-9a2d-19ae-607a-594ee88d1ba1@de.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/03/2020 12:28, Christian Borntraeger wrote: > > On 05.03.20 10:30, Vincent Guittot wrote: >> Le mercredi 04 mars 2020 à 20:59:33 (+0100), Christian Borntraeger a écrit : >>> >>> On 04.03.20 20:38, Christian Borntraeger wrote: >>>> >>>> >>>> On 04.03.20 20:19, Dietmar Eggemann wrote: [...] > It seems to speed up the issue when I do a compile job in parallel on the host: > > Do you also need the sysfs tree? [ 87.932552] CPU23 path=/machine.slice/machine-test.slice/machine-qemu\x2d18\x2dtest10. on_list=1 nr_running=1 throttled=0 p=[CPU 2/KVM 2662] [ 87.932559] CPU23 path=/machine.slice/machine-test.slice/machine-qemu\x2d18\x2dtest10. on_list=0 nr_running=3 throttled=0 p=[CPU 2/KVM 2662] [ 87.932562] CPU23 path=/machine.slice/machine-test.slice on_list=1 nr_running=1 throttled=1 p=[CPU 2/KVM 2662] [ 87.932564] CPU23 path=/machine.slice on_list=1 nr_running=0 throttled=0 p=[CPU 2/KVM 2662] [ 87.932566] CPU23 path=/ on_list=1 nr_running=1 throttled=0 p=[CPU 2/KVM 2662] [ 87.951872] CPU23 path=/ on_list=1 nr_running=2 throttled=0 p=[ksoftirqd/23 126] [ 87.987528] CPU23 path=/user.slice on_list=1 nr_running=2 throttled=0 p=[as 6737] [ 87.987533] CPU23 path=/ on_list=1 nr_running=1 throttled=0 p=[as 6737] Arrh, looks like 'char path[64]' is too small to hold 'machine.slice/machine-test.slice/machine-qemu\x2d18\x2dtest10.scope/vcpuX' ! ^ But I guess that the 'on_list=0' for 'machine-qemu\x2d18\x2dtest10.scope' could be the missing hint?