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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH] mm/hugetlb.c: fix a bug within a BUG(): inconsistent pte comparison Content-Language: en-US To: James Houghton CC: Andrew Morton , LKML , , Adrian Hunter , Al Viro , Alex Williamson , Alexander Potapenko , Alexander Shishkin , Andrey Konovalov , Andrey Ryabinin , "Christian Brauner" , Christoph Hellwig , "Daniel Vetter" , Dave Airlie , Dimitri Sivanich , Dmitry Vyukov , Ian Rogers , Jason Gunthorpe , Jiri Olsa , Johannes Weiner , "Kirill A . Shutemov" , Lorenzo Stoakes , Mark Rutland , Matthew Wilcox , Miaohe Lin , Michal Hocko , Mike Kravetz , Mike Rapoport , Muchun Song , Namhyung Kim , Naoya Horiguchi , "Oleksandr Tyshchenko" , Pavel Tatashin , Roman Gushchin , "Ryan Roberts" , SeongJae Park , Shakeel Butt , Uladzislau Rezki , Vincenzo Frascino , Yu Zhao References: <20230630013203.1955064-1-jhubbard@nvidia.com> From: John Hubbard In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.126.231.35] X-ClientProxiedBy: rnnvmail203.nvidia.com (10.129.68.9) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT030:EE_|CH3PR12MB8283:EE_ X-MS-Office365-Filtering-Correlation-Id: bc7e1432-a386-4369-6643-08db790eb44d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: liKbjnjr1EwoCJ8Uv350Qn41TE417Q1LtDPS36HmysnP9pNrf3Xdl5s0u6Y/Kf7D1ApmUtxgzlh8Wx4h1NFiLFWZi2xL00QyzgKCmStHJe58El6bU+0w9z1GN1K3Hutpnns1KxSVCYhqJ0MidNZuWhR7nCYO55W2g8zIkY2z6UZz9ONQH4oGarjo/6IoilasHbj7QKvAh6aFm13xulJXcRhwV2OoPZIOwTsqsMwdWPFbaUph4g4xz2K5OLPfBZVsAuJIXkg1RD6G+9fl//MvVadVmrsVCLsgq9A28xja5ZCNXLO9OeHv5Yi0MP2Lbn+HwaszEZenGs//PZhVPVYenPtzZ7z69VxKdaCvEjtzrWkwfvwOVBsXgXDKpsPM+NeQ+Z18FwCE3R6uQazArOFqEFQASGhF24PZoU6d9sP7bk2/7/j0a7zgRvVrn7RNeyWDmbbgFl2iHj+h1f4kjoHvaxqt5+291NtTs05zH42KTgJt71eu0Ks1w9WCELfZtyi2L0TAttGyUEhuyFPbI/QFYfjNaEM/3804jevAQqOK2VBEffEGsaQ3ZwTxiLZEGPXRTV1s3eS9ClJzd30uh3zVSgezxl3QWLiHZbudba622EErKqHIKJ5loqQ77LnEX5ETRWKxgEQMIERVwQuzeLWnQelJMYNEeiJ9YYdmOhDG/CIonEO6zG0v1s3mjPywyB6l1JF7ejEPG5H3fSFeNIA949pk9pXpFL1Dprzwm77Hufn9ZtbqGt49ktpidtkzUYdfzMqnQ85E8P2OWHpQ1s92aw== X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230028)(4636009)(396003)(39860400002)(346002)(376002)(136003)(451199021)(46966006)(36840700001)(40470700004)(36756003)(4326008)(70206006)(16576012)(54906003)(70586007)(478600001)(6916009)(186003)(26005)(82310400005)(40480700001)(4744005)(41300700001)(2906002)(8936002)(8676002)(53546011)(16526019)(5660300002)(7406005)(7416002)(7636003)(356005)(40460700003)(316002)(82740400003)(426003)(31686004)(86362001)(2616005)(31696002)(36860700001)(47076005)(336012)(43740500002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jun 2023 02:07:06.2969 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bc7e1432-a386-4369-6643-08db790eb44d X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT030.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8283 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 8E87118000D X-Stat-Signature: 9x8ndbxppzkhidfn414wppg89n3n59px X-Rspam-User: X-HE-Tag: 1688090829-503182 X-HE-Meta: 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 KMuTsTeX Pm7mhnx9RHxm58m8FCCp7W/loUS1aO350kOvJsg+odGDgekTKtntxE9FQaCDiRMfpZGuvc0o1Bkv5C3INZ6QsSVtxvI8cCsfw9pI6z0xz6WGgqVbmNPg3XGUCxEjq893gisCNx4w8mvbbDc8Z2OHYHLBtjfzJ3DSipwPvkfFQQFntO6Lyb5L+7dpacPM7o8c3plw5JtSRRJwDVY2oUHrB2TWz2zd+GTSZTaR60kDkZMx1zQjBJrJrbdOaQ9+RDnb3FtLSO0kLAZ7QR1fOqCJ3xmYoI0cLNxRLEOugtBfpFFklXrNyKC44o9SJx5UUm25OVFShZCatOf2+NKTFyhoYxP3u0Fk3H8Fh0M6yGeIougku/IHuYsHS32gxbA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/29/23 18:50, James Houghton wrote: > Hi John, > > Good catch, and thanks for the detailed explanation. It looks like > riscv and powerpc have equivalent problems in their huge_pte_alloc > implementations, perhaps it's worth taking a look at those. (riscv > looks like it has precisely the same problem except it's a WARN, but > powerpc looks more interesting.) > > Either way, > > Acked-by: James Houghton Thanks for the ack, and yes, riscv and powerpc do look like the same problem to me, too. I'm glad you thought to look there, as I have fallen into tunnel vision while investigating this, heh. OK, as long as I'm here, let me fix those up, too. I'll make those a separate patch, because they are still in the "fragile" state, rather than actually at the full crash state. :) thanks, -- John Hubbard NVIDIA