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[2003:d8:2f35:8a00:42f7:2657:34cc:a51f]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b79c48de68sm22959311f8f.67.2025.08.06.05.39.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 Aug 2025 05:39:49 -0700 (PDT) Message-ID: <1a4df59e-e734-4ff5-b1b0-0a754afb6f67@redhat.com> Date: Wed, 6 Aug 2025 14:39:48 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/memory-failure: fix infinite UCE for VM_PFNMAP pfn To: Jinjiang Tu , linmiaohe@huawei.com, nao.horiguchi@gmail.com, akpm@linux-foundation.org, xueshuai@linux.alibaba.com, ziy@nvidia.com, osalvador@suse.de, linux-mm@kvack.org Cc: wangkefeng.wang@huawei.com References: <20250806020520.631203-1-tujinjiang@huawei.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: <20250806020520.631203-1-tujinjiang@huawei.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: bbN_S7EV7gBuT28sNrCXPkv6Qeo_noXFG2PgpuL4Nuw_1754483990 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 72CEC40003 X-Stat-Signature: ani5oeou3hm3t6ky55kui1qeej11bta7 X-HE-Tag: 1754483993-786815 X-HE-Meta: U2FsdGVkX19ZGy7ie4UjsJhMeTSo04kjuGW23BVm/e2jwicv+l/ah/V1ZuW6lJ/BIKykZO6br0oxNiVOulZY/Lp7B7DPinWdoVC0af90FExexT7w/iwGN7o0gjLd0WgKSarAcqwJpcq2sGMzQn0jHUefDHNxTp3HdqxhFoXQJ2MiUy9cwJYqbs2ohPinaKfGZ6m2BL4alw8U0abVAF6uFTgIw24t0MN1ISYcByD7uevfN8LjFP7a9ZED3x+tc29du/ScIzyn2+1u0vZ+K7hI8KWhqz8Rt+89QJ+i9CnprTCSuQ4WZ2hTCVKc+XZX+HgNu2vLGNVmKa/FYrUhNUA/nzeEvdawSpz90RNWWDeCMHUQD7836iV7g5JY+AVSSD/25M7AB04epmZaomynxnthTqT4oL/NIswt5VShPxqH13uxtQpl9YqB0AxMzC88LXg6vIIxj32baY5qhGfH58l93VQqUuDaDkYcz3Co5tggplll1e/X2Kx3yyhQdI7JlYh1pilasGQRFzDjm0SvyHZw1c8Tkh6nvVtVq8VXz449zpQ/Zsg2u9RjPrIX4INcf02RkRQFJ2VrTQcyi2R5SVCIsmuKSIMv1B/dt7QbvzER+D7Gl2qktg4KKtcdY+2/SHwiFGbbPSSmEpcyKVHhiHqHAUzcK9OT29UMLeRB4K4P6OigGdeIwXjhMYuWhQM4XQ41hyV0IIjS8+ao1GjSFb1zar/vV9BNw5AAAszX8P18DU5jFEKdqxLk7cKjR9+5L7rQb74SLhXkvTqLN2UW6WMC2fWFSaf9zCV88F7r45bBw5WcCl+m3tE5V7GBF3CdksBPnGkWPtLpkTvLxiPLzcqZFQu5NYn6OqbmBGwuEGBcCXg+y1HcDys62065Qbrm+DU+USbLREz+YdESaOIIgaF0wF/9QvIiMlt1C1fDLDPedm8vtIwaxxFfVl9s5XgnXsnD4K4bILh1XoW2crvPy8w KNX528Es 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 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: List-Subscribe: List-Unsubscribe: On 06.08.25 04:05, Jinjiang Tu wrote: > When memory_failure() is called for a already hwpoisoned pfn, > kill_accessing_process() will be called to kill current task. However, if > the vma of the accessing vaddr is VM_PFNMAP, walk_page_range() will skip > the vma in walk_page_test() and return 0. That check is dubious and it's on my todo list to revisit that, because it doesn't make sense for COW VM_PFNMAP mappings. But I am curious, is this about having an anon page in a COW VM_PFNMAP, or on "what kidn of page" do you get the fault? -- Cheers, David / dhildenb