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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1077DC25B0E for ; Mon, 15 Aug 2022 11:01:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232406AbiHOLBJ (ORCPT ); Mon, 15 Aug 2022 07:01:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45968 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241824AbiHOLAt (ORCPT ); Mon, 15 Aug 2022 07:00:49 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 16F566479; Mon, 15 Aug 2022 04:00:48 -0700 (PDT) Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27FAD2E0029408; Mon, 15 Aug 2022 11:00:09 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=message-id : date : mime-version : subject : to : cc : references : from : in-reply-to : content-type : content-transfer-encoding; s=qcppdkim1; bh=Z3aS594wlbhZKWisoOFso7+h9XZN3ISVE0QdwPxZcJY=; b=WRBbzsoENcdRq19Ujq2hw46Z6kxBNsWKO06VrzMF7SEyBencFrzeigFRF12ZLZzSkNXP 0EpHbA96kWD0/6PCPMHpwlmD6XJ7ClZ3C5J0WGdSg5JXWc9Ud2rNs8Qf6nXHbWIBXW4x gWYRwVNfT7Lhl/3UVd0ni1Y6x0pIV50SiGAEjrzAk8nZFYIlanb+8wvt+i7A/lqdQg5W asIyl83STQ/srrHqvga0Dt67TY8WH5+/g9gOnyPs8FgQLHvrvtroZa8ReMh/PFt7FTi7 QFuJB9ip3HQeqiTnKYIf403tk/9/MHOcUHiWzhqP00mxAfE893BDU4FhNDb9Tr65HCCI Ug== Received: from nasanppmta02.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3hx1aud5d9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 15 Aug 2022 11:00:09 +0000 Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 27FB08Ov013879 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 15 Aug 2022 11:00:08 GMT Received: from [10.216.30.233] (10.80.80.8) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Mon, 15 Aug 2022 04:00:03 -0700 Message-ID: Date: Mon, 15 Aug 2022 16:29:24 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0 Subject: Re: Query regarding deadlock involving cgroup_threadgroup_rwsem and cpu_hotplug_lock Content-Language: en-US To: =?UTF-8?Q?Michal_Koutn=c3=bd?= , Xuewen Yan CC: Tejun Heo , Imran Khan , , , , , , , , Zhao Gongyi , Zhang Qiao References: <8245b710-8acb-d8e6-7045-99a5f71dad4e@oracle.com> <26d0e4cc-be0e-2c12-6174-dfbb1edb1ed6@oracle.com> <224b19f3-912d-b858-7af4-185b8e55bc66@quicinc.com> <20220815090556.GB27407@blackbody.suse.cz> <20220815093934.GA29323@blackbody.suse.cz> From: Mukesh Ojha In-Reply-To: <20220815093934.GA29323@blackbody.suse.cz> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: g09p5XzNTrHElQUZFQKcos2Wl2zs6yvx X-Proofpoint-ORIG-GUID: g09p5XzNTrHElQUZFQKcos2Wl2zs6yvx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-15_06,2022-08-15_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 bulkscore=0 adultscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 mlxscore=0 suspectscore=0 priorityscore=1501 clxscore=1011 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208150040 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/15/2022 3:09 PM, Michal Koutný wrote: > On Mon, Aug 15, 2022 at 05:25:52PM +0800, Xuewen Yan wrote: >> Your means is that the problem should be fixed by [1]+[2]'s revert ? > > I understood that was already the combination you had tested. > You write in [T] that [1] alone causes (another) deadlock and therefore > the revert of [2] was suggested. > >> I just tested the case which reverted the [2]. Need I test with [1] and [2]? > > It'd be better (unless you haven't already :-), my reasoning is for the > [1]+[2] combo. Feel free to add my Reported-and-tested-by: Mukesh Ojha -Mukesh > > Thanks, > Michal > > [T] https://lore.kernel.org/r/CAB8ipk_gCLtvEahsp2DvPJf4NxRsM8WCYmmH=yTd7zQE+81_Yg@mail.gmail.com/