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[2003:d8:2f25:900:2e1e:d717:2543:c4d6]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-459e5869cccsm139284515e9.17.2025.08.08.01.08.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 08 Aug 2025 01:08:31 -0700 (PDT) Message-ID: Date: Fri, 8 Aug 2025 10:08:30 +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> <1a4df59e-e734-4ff5-b1b0-0a754afb6f67@redhat.com> <14abf20d-d3d0-46fe-8184-6dbc97a4e5ab@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: <14abf20d-d3d0-46fe-8184-6dbc97a4e5ab@huawei.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 9JAcyQvEqTHaa75VoxMvefH49c__kn7_PvsfHM9_Yw0_1754640512 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Stat-Signature: et9mpyx761ottm83rojruesskan4tug3 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 14F84140009 X-Rspam-User: X-HE-Tag: 1754640515-109037 X-HE-Meta: U2FsdGVkX1+objlKZCb+IJKzqAPVBhXdNFxVxXTQVwosh+6jswxskY4HOQYr3cz04ubyAv48loc9hzfnUebebCAoI0sEnwUqWbarlSRTld7FpTY/lBJF4/y1AWmUj2U6ww/J3zT++dykzOYbpb8bVaJGQpp9sgwgfme//dOHb81T+i35axe9fsWaDlr616eTKi39yjdk0bPR8kgIQDN9aziF//7m/cmgT0CjzdFbPC8JDmWtWGV1s4q98QJ2XwTokbnw+EpNBGyBt0iofaaJ4/ZYUlngysHgcydKgjmIYcg2vL0IB+36bGbzmZNs1GBvhgaMmcwWLgrSi1LI9PzzJUkYv+m309kYiM4zbxNDEwJquMXKp3LwDxc8JbmUIgTNTBrJBiFIJMT4Xnea/9hKi+IMB9g26QMJCNEYbzvnR9S3/W0wxSgRfGhAPwcCvw65dcw44Sd6Ci8479KpdEYygGLtRyFbgyBfOFTcJ60EuPPK1Ca9LMTgxOoNDn+BbuGYWA4e56TZNr91eeNeVS9gyrwHLzTtVKAzOGJCL2HuJdrEkvGuJE9qa2ixK6xgyQTTdhQEPBUZMgznDo3ehaheK+7GIB8pj7EEeNxE8V/Djn0/Bfm+H9Dl3kWPqBEX1XM7PyqSRyQki/TQtxtJlc43coya3Dd031bVELLLss2EhHDKdGhTkKvyYnnYBsAHWXObbhMqiZMkjaBVyvLDEozzuboYn3epYLorAcIljMl5MlqNimkJRniSo0YPfJEHx+Pa5wTF1DYOWLV6IpqrmBVcQoBZIyBvP+xrDPVuZ8o95OSlD3fBcsD8GkfamX0cPcpiTwCJRxRa/WNYDbq0aQh4A4PNasXcwC2TewjUfBmWp+4SXZZZLkVw53c+2n5Ez44cWn+bYcWrFOBqcKIkWK5AbQPdiPeaZYzXdmyTMSnKeENO1Ps0NEB4XYpEGv3l9HonA6JfBzHK0CC6QvHsj5D 0J3CohsA 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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 07.08.25 13:06, Jinjiang Tu wrote: > > 在 2025/8/6 20:39, David Hildenbrand 写道: >> 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? > The pfn is RAM pfn, which is mapped with remap_pfn_range(). There is no > COW. > Ah, and that works because in check_hwpoisoned_entry() we are only using pte_pfn(). -- Cheers, David / dhildenb