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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 0346DC43387 for ; Thu, 27 Dec 2018 21:06:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B4EBF218FE for ; Thu, 27 Dec 2018 21:06:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730136AbeL0VGS (ORCPT ); Thu, 27 Dec 2018 16:06:18 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:53810 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728693AbeL0VGS (ORCPT ); Thu, 27 Dec 2018 16:06:18 -0500 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wBRL3b54133541 for ; Thu, 27 Dec 2018 16:06:16 -0500 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0a-001b2d01.pphosted.com with ESMTP id 2pn1cjwpec-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 27 Dec 2018 16:06:16 -0500 Received: from localhost by e06smtp03.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 27 Dec 2018 21:06:12 -0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wBRL6Bim65274100 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 27 Dec 2018 21:06:11 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 224CFAE059; Thu, 27 Dec 2018 21:06:11 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 59924AE045; Thu, 27 Dec 2018 21:06:10 +0000 (GMT) Received: from oc7330422307.ibm.com (unknown [9.145.166.101]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 27 Dec 2018 21:06:10 +0000 (GMT) Subject: Re: 4.19.5 and later has tons of false messages "BUG: non-zero pgtables_bytes on freeing mm: -16384" To: Sasha Levin Cc: Martin Schwidefsky , stable@vger.kernel.org, linux-s390 , linux-kernel@vger.kernel.org, Greg Kroah-Hartman References: <4e58571e-1991-4a70-7012-ff9dd76afee3@de.ibm.com> <1d6288dd-a65b-463a-8aeb-33904dafa9cc@de.ibm.com> <20181227210136.GV86645@sasha-vm> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20181227210136.GV86645@sasha-vm> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 18122721-0012-0000-0000-000002DE8A94 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18122721-0013-0000-0000-000021153CA5 Message-Id: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-12-27_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=644 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1812270185 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/27/2018 10:01 PM, Sasha Levin wrote: > On Thu, Dec 27, 2018 at 10:28:56AM +0100, Christian Borntraeger wrote: >> >> >> On 27.12.2018 10:13, Christian Borntraeger wrote: >>> Martin, >>> >>> Right now you get a message >>> "BUG: non-zero pgtables_bytes on freeing mm: -16384" >>> for EVERY process that exits in 4.19.5 and later. >>> >>> bisect points to >>> commit 4136161d676a93fc8df6bdb80d720c15522d6c24 >>> Author: Martin Schwidefsky >>> Date:   Mon Oct 15 11:09:16 2018 +0200 >>> >>>     s390/mm: fix mis-accounting of pgtable_bytes >>> >>>     [ Upstream commit e12e4044aede97974f2222eb7f0ed726a5179a32 ] >>> >>> Turns out that this patch requires several dependencies so the autoselection of this >>> patch was missing that. >>> >>> Can we either revert this patch or add the dependencies? >>> >>> Christian >>> >> >> It seems that adding >> >> commit 6d212db11947ae5464e4717536ed9faf61c01e86 ("mm: add mm_pxd_folded checks to pgtable_bytes accounting functions") >> fixes the issue. > > I've queued 6d212db11947 for 4.19 for now, thank you. Not sure, but you might need 1071fc5779d98 mm: introduce mm_[p4d|pud|pmd]_folded a8874e7e8a889 mm: make the __PAGETABLE_PxD_FOLDED defines non-empty to avoid compile errors on !s390.