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=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,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 0E27AC4743C for ; Mon, 21 Jun 2021 17:32:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E87CF6112D for ; Mon, 21 Jun 2021 17:32:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231513AbhFUReW (ORCPT ); Mon, 21 Jun 2021 13:34:22 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:17184 "EHLO mx0b-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231252AbhFUReV (ORCPT ); Mon, 21 Jun 2021 13:34:21 -0400 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 15LHUT4V059089; Mon, 21 Jun 2021 13:31:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=content-type : subject : from : in-reply-to : date : cc : message-id : references : to : content-transfer-encoding : mime-version; s=pp1; bh=dN/oN0n9tLV8UYomMqhhtIvx1sfbdn8AhVSokNCO/6g=; b=OHmCp7QT3CPbjGpUtWV7P996093GvTISSIaYbrMOwTRb1guoENQ24KNAgFmHLVweLmug wSgwdIT81QwXxQp2InBMszRcr3MX1fh3fRqlk2VU3xgI149ciR5I20CItJ3khgenEWFb 33rOXRRxztyv4zInOGMCGcR/Vr45H5QMmEryytFuTS+7q5R2rEnk2wKr5XpY1dsv2+aM 0ziivzMI4jkJUbvXCQ7v8V7sii3HoS6YNu00XHQTY0uhNlhnAFyjdyff8nRz0Zq3b3QZ qejGVyV9cUbqN5XSAUEB9QD+yxHGDn+ubA/dwpD9mtGhs4YegS2nhvtszWp6tjTYWqti VQ== Received: from ppma03fra.de.ibm.com (6b.4a.5195.ip4.static.sl-reverse.com [149.81.74.107]) by mx0a-001b2d01.pphosted.com with ESMTP id 39aup3qqb6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 21 Jun 2021 13:31:57 -0400 Received: from pps.filterd (ppma03fra.de.ibm.com [127.0.0.1]) by ppma03fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 15LHETPt019177; Mon, 21 Jun 2021 17:31:55 GMT Received: from b06cxnps4076.portsmouth.uk.ibm.com (d06relay13.portsmouth.uk.ibm.com [9.149.109.198]) by ppma03fra.de.ibm.com with ESMTP id 3998788j4w-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 21 Jun 2021 17:31:55 +0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 15LHVrcw23331192 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 21 Jun 2021 17:31:53 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3576EA405B; Mon, 21 Jun 2021 17:31:53 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 38637A4060; Mon, 21 Jun 2021 17:31:52 +0000 (GMT) Received: from smtpclient.apple (unknown [9.77.196.19]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 21 Jun 2021 17:31:52 +0000 (GMT) Content-Type: text/plain; charset=us-ascii Subject: Re: [powerpc][5.13.0-rc7] Kernel warning (kernel/sched/fair.c:401) while running LTP tests From: Sachin Sant In-Reply-To: Date: Mon, 21 Jun 2021 23:01:51 +0530 Cc: Peter Zijlstra , Odin Ugedal , linuxppc-dev@lists.ozlabs.org, open list Message-Id: <14EEE4A4-B2B1-4D0C-B2F6-BDB7C11B05DE@linux.vnet.ibm.com> References: <9D4A658A-5F77-4C33-904A-126E6052B205@linux.vnet.ibm.com> <6D1F875D-58E9-4A55-B0C3-21D5F31EDB76@linux.vnet.ibm.com> <20210621162243.GA29874@vingu-book> To: Vincent Guittot X-Mailer: Apple Mail (2.3654.100.0.2.22) X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: A57L-lTFSpwIsTbGCYyBbkxDN9_wFonX X-Proofpoint-GUID: A57L-lTFSpwIsTbGCYyBbkxDN9_wFonX Content-Transfer-Encoding: quoted-printable X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.790 definitions=2021-06-21_10:2021-06-21,2021-06-21 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxlogscore=999 suspectscore=0 adultscore=0 phishscore=0 malwarescore=0 bulkscore=0 clxscore=1015 spamscore=0 mlxscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106210101 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>> Any thoughts Vincent? >>=20 >>=20 >> I would prefer that we use the reason of adding the cfs in the list inst= ead. >>=20 >> Something like the below should also fixed the problem. It is based on a >> proposal I made to Rik sometimes ago when he tried to flatten the rq: >> https://lore.kernel.org/lkml/20190906191237.27006-6-riel@surriel.com/ >>=20 >> This will ensure that a cfs is added in the list whenever one of its ch= ild >> is still in the list. >=20 > Could you confirm that this patch fixes the problem for you too ? >=20 Thanks for the fix. The patch fixes the reported problem. The test ran to completion without any failure.=20 Reported-by: Sachin Sant Tested-by: Sachin Sant -Sachin