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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 10938C4321A for ; Fri, 28 Jun 2019 11:49:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D096821726 for ; Fri, 28 Jun 2019 11:49:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726823AbfF1Lt5 (ORCPT ); Fri, 28 Jun 2019 07:49:57 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:62874 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726564AbfF1Lt5 (ORCPT ); Fri, 28 Jun 2019 07:49:57 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x5SBktql034395 for ; Fri, 28 Jun 2019 07:49:56 -0400 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0b-001b2d01.pphosted.com with ESMTP id 2tdgnvm2ye-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 28 Jun 2019 07:49:55 -0400 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 28 Jun 2019 12:49:54 +0100 Received: from b06cxnps3075.portsmouth.uk.ibm.com (9.149.109.195) by e06smtp05.uk.ibm.com (192.168.101.135) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 28 Jun 2019 12:49:51 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x5SBnoRP55574710 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 28 Jun 2019 11:49:50 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 64FEA52052; Fri, 28 Jun 2019 11:49:50 +0000 (GMT) Received: from localhost.localdomain (unknown [9.85.75.80]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTPS id 4250B5204E; Fri, 28 Jun 2019 11:49:49 +0000 (GMT) Subject: Re: power9 NUMA crash while reading debugfs imc_cmd To: Qian Cai Cc: Michael Ellerman , "Aneesh Kumar K.V" , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org References: <1561670472.5154.98.camel@lca.pw> <87lfxms8r3.fsf@concordia.ellerman.id.au> <715A934D-EE3A-478B-BA77-589C539FC52D@lca.pw> From: Anju T Sudhakar Date: Fri, 28 Jun 2019 17:19:47 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <715A934D-EE3A-478B-BA77-589C539FC52D@lca.pw> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 19062811-0020-0000-0000-0000034E5C46 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19062811-0021-0000-0000-000021A1DC69 Message-Id: <9c87dc72-54f8-8510-c400-1e89779cc88b@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-28_04:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=938 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906280140 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/28/19 9:04 AM, Qian Cai wrote: > >> On Jun 27, 2019, at 11:12 PM, Michael Ellerman wrote: >> >> Qian Cai writes: >>> Read of debugfs imc_cmd file for a memory-less node will trigger a crash below >>> on this power9 machine which has the following NUMA layout. >> What type of machine is it? > description: PowerNV > product: 8335-GTH (ibm,witherspoon) > vendor: IBM > width: 64 bits > capabilities: smp powernv opal Hi Qian Cai, Could you please try with this patch: https://lists.ozlabs.org/pipermail/linuxppc-dev/2019-June/192803.html and see if the issue is resolved? Thanks, Anju