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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 11 Oct 2018 14:02:14 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w9BD2DZP4981088 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 11 Oct 2018 13:02:13 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 13698AE05A; Thu, 11 Oct 2018 16:00:56 +0100 (BST) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D6875AE055; Thu, 11 Oct 2018 16:00:55 +0100 (BST) Received: from mschwideX1 (unknown [9.152.212.164]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 11 Oct 2018 16:00:55 +0100 (BST) Date: Thu, 11 Oct 2018 15:02:11 +0200 From: Martin Schwidefsky To: Li Wang Cc: Guenter Roeck , Janosch Frank , "Kirill A. Shutemov" , Heiko Carstens , linux-kernel , Linux-MM Subject: Re: s390: runtime warning about pgtables_bytes In-Reply-To: References: X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.30; x86_64-pc-linux-gnu) X-TM-AS-GCONF: 00 x-cbid: 18101113-0008-0000-0000-0000027E21DD X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18101113-0009-0000-0000-000021E76940 Message-Id: <20181011150211.7d8c07ac@mschwideX1> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-10-11_06:,, 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=828 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1810110127 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 11 Oct 2018 18:04:12 +0800 Li Wang wrote: > When running s390 system with LTP/cve-2017-17052.c[1], the following BUG is > came out repeatedly. > I remember this warning start from kernel-4.16.0 and now it still exist in > kernel-4.19-rc7. > Can anyone take a look? > > [ 2678.991496] BUG: non-zero pgtables_bytes on freeing mm: 16384 > [ 2679.001543] BUG: non-zero pgtables_bytes on freeing mm: 16384 > [ 2679.002453] BUG: non-zero pgtables_bytes on freeing mm: 16384 > [ 2679.003256] BUG: non-zero pgtables_bytes on freeing mm: 16384 > [ 2679.013689] BUG: non-zero pgtables_bytes on freeing mm: 16384 > [ 2679.024647] BUG: non-zero pgtables_bytes on freeing mm: 16384 > [ 2679.064408] BUG: non-zero pgtables_bytes on freeing mm: 16384 > [ 2679.133963] BUG: non-zero pgtables_bytes on freeing mm: 16384 > > [1]: > https://github.com/linux-test-project/ltp/blob/master/testcases/cve/cve-2017-17052.c Confirmed, I see this bug with cvs-2017-17052 on my LPAR as well. I'll look into it. -- blue skies, Martin. "Reality continues to ruin my life." - Calvin.