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[80.187.83.110]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46e61a029a0sm286626055e9.13.2025.10.07.00.05.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Oct 2025 00:05:02 -0700 (PDT) Message-ID: Date: Tue, 7 Oct 2025 09:04:59 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] mm/migrate: make sure folio_unlock() before folio_wait_writeback() To: Yunseong Kim , Byungchul Park , Hillf Danton Cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel_team@skhynix.com, Yeoreum Yun References: <20251002081612.53281-1-byungchul@sk.com> <20251002220211.8009-1-hdanton@sina.com> <20251003004828.GA75385@system.software.com> <20251003005230.GB75385@system.software.com> <3b66d603-543d-4616-92a5-9e6e32f116be@kzalloc.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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <3b66d603-543d-4616-92a5-9e6e32f116be@kzalloc.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 36NdyuFozSx1LMv1s5o6G0PEjBcwIYrzZ5FJNrIcv2w_1759820703 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: a9xkgthkgerjcxjbbi6fa73hfyoidtrx X-Rspamd-Queue-Id: 0E85518000B X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1759820705-280148 X-HE-Meta: U2FsdGVkX1/maoMJZTXmK447uZ3n1dTpxYtZpRklY4E4fd0BHj5XFhubL8YCrPM5g1EUmUMt85/3IPXflq+49wQqH64TAtDd4HtkKJnHkeMhSFVh3R6tjc1jIC3I8Tm9TW4ibNdXMadllDR2XRvv6rHjaWhq3how5QbKbgHBNaCPS6mrqel91BcRtIcP2ZlV18LmDOvfUEgPqrNV9NbWGHbE9bNwCS9VfcBLeL5hleSoiMpSYi8n5NHFL+PiH4HwZGz/uPSdMy7ViQEzFpyfvdABG9yjHg3IdVcaJyRWALlr7VBMtQoy9XSBCGLl48nSmht1EtkZXHWx3zV+vaFBPoCgr+kmp4kyzPixyrODT4YiOxVLkKAKS4Q1VOWDzBI7ucgkXtjYwxQxcOIjQaqD0c8lMS0hkWXuGmIr2YCgts6HAPi2JnuaTk0J1a/4R7Od5uQTXob2hMP1g4QjKawoESOXTZHrZBHzKCvAw5p7wdbz8iJoA9iSFeYZX7pcdFM8mGk0fRZHDdP/SuM++ULmwVCacORp4XkHB7do/cHJhrYi4KseqkE/kAROyKmjvYVkxWChhB9C5x2q3wW3JTFT8i3UOrYN6X73cNQ7o+yBxQnkyIHulYM6ejUR7w9P9B3hpMl5ZnVUiv37m8hmj0toRdKJLBzRD5W+7aL0AV1PFrfVX6vOqz1Lx92RiwALR9pkZZaGjBBr1EChMgMZUvb8gfgrkC32Sf0Io+SlYYGQSU9W5vM00b1UW4eCyYPFcmPYIIkQXfG0Pe07WRmOYc9SkRnAqxAIf9whNP+ejB9oTBJIUO6a9eqNx1IyNHm5ZR4PlWQ/oYAx0S3/QpLUIs7Gq3yayQYGbcy5jIZeIL/uRKHKfE9sOEn2AKxelyQBTKd7r7DbXn1f77u4ef7PTmFY6XCcM8JAP3aszwnIUh2ch/uiCBLzsdrHkIlSgZM2IKSA/ej+sV4MCNA64xc7uPo OuCUl5gq C3H3jd3PhJIojPs4MsPql/xsl1x0wo4ejfZAqHggUYwcj4HBJPNu1E44J/OLyfXQYX2dvmeOLeY5RWL6kZXeSnt5fjQ== 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 07.10.25 08:32, Yunseong Kim wrote: > Hi Hillf, > > Here are the syzlang and kernel log, and you can also find the gist snippet > in the body of the first RFC mail: > > https://gist.github.com/kzall0c/a6091bb2fd536865ca9aabfd017a1fc5 > > I am reviewing this issue again on the v6.17, The issue is always reproducible, > usually occurring within about 10k attempts with the 8 procs. I can see a DEPT splat and I wonder what happens if DEPT is disabled. Will the machine actually deadlock or is this just DEPT complaining (and probably getting something wrong)? -- Cheers David / dhildenb