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=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 45E63C2B9F8 for ; Tue, 25 May 2021 13:01:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2CA7E61181 for ; Tue, 25 May 2021 13:01:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233020AbhEYNDR (ORCPT ); Tue, 25 May 2021 09:03:17 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:41529 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S232991AbhEYNDN (ORCPT ); Tue, 25 May 2021 09:03:13 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 14PCheeH098926; Tue, 25 May 2021 09:01:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=pp1; bh=heKL48jhTKHG+0Zf7GGx5pc2nTO7LUu6qGQW5p/pJiw=; b=m+/4Csr7PprAgzVd7tgMLPdGfwtdhI119P5i2v1HdcKKhFo64NrJyc+6Ei9Ab7omwQZ7 B0bLzR/CDFgvT4MysPx8NzkYJ0ids4UnNh+vdyJgBmssuvpPbhk1Z9Drn6NRW1xUGO/U xDp2cRIr6fh1CSmh2c+wpOBYck7IYDF1o1yBXkdra6DVuGc37u9FqO+lLCqrDo1ssJv8 sY6fEw4WQJumzHHRbVrSE2w8qQQWn86xQSAb4ZpwArFnBNb8th6CttmtXV8fN5QeuxU1 jeTWrwFRJm4yhs1aQw9N3Dub0dtJRkbkfhztnKekRGOFe6BijRefbpndUsF0aEfoM30j Fg== Received: from ppma04ams.nl.ibm.com (63.31.33a9.ip4.static.sl-reverse.com [169.51.49.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 38s1g68kum-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 25 May 2021 09:01:35 -0400 Received: from pps.filterd (ppma04ams.nl.ibm.com [127.0.0.1]) by ppma04ams.nl.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 14PD0KAf002901; Tue, 25 May 2021 13:01:33 GMT Received: from b06cxnps3074.portsmouth.uk.ibm.com (d06relay09.portsmouth.uk.ibm.com [9.149.109.194]) by ppma04ams.nl.ibm.com with ESMTP id 38s1r48016-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 25 May 2021 13:01:33 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 14PD1VqW28705204 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 25 May 2021 13:01:31 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4A19BAE055; Tue, 25 May 2021 13:01:31 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F2DB9AE04D; Tue, 25 May 2021 13:01:30 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 25 May 2021 13:01:30 +0000 (GMT) From: Gerald Schaefer To: Andrew Morton , Anshuman Khandual Cc: linux-mm , LKML , linux-arch , linux-sparc , linux-s390 , Gerald Schaefer Subject: [PATCH 0/1] mm/debug_vm_pgtable: fix alignment for pmd/pud_advanced_tests() Date: Tue, 25 May 2021 15:00:42 +0200 Message-Id: <20210525130043.186290-1-gerald.schaefer@linux.ibm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: UaPDqLmwIwnWKJEQumuWDv4XxDdjtyjp X-Proofpoint-ORIG-GUID: UaPDqLmwIwnWKJEQumuWDv4XxDdjtyjp X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-05-25_06:2021-05-25,2021-05-25 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 impostorscore=0 clxscore=1011 phishscore=0 mlxlogscore=683 adultscore=0 lowpriorityscore=0 bulkscore=0 suspectscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2105250077 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We sometimes see a "BUG task_struct (Not tainted): Padding overwritten" on s390, directly after running debug_vm_pgtable. This is because of wrong vaddr alignment in pmd/pud_advanced_tests(), leading to memory corruption at least on s390, see patch description. At first glance, other architectures do not seem to care about vaddr in their xxx_get_and_clear() implementations, so they should not be affected. One exception is sparc, where the addr is passed over to some tlb_batch code, but I'm not sure what implication the wrongly aligned vaddr would have in this case. Also adding linux-arch, just to make sure. Gerald Schaefer (1): mm/debug_vm_pgtable: fix alignment for pmd/pud_advanced_tests() mm/debug_vm_pgtable.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) -- 2.25.1