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[80.187.83.189]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46fab3cd658sm126106175e9.1.2025.10.13.01.08.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 Oct 2025 01:08:44 -0700 (PDT) Message-ID: Date: Mon, 13 Oct 2025 10:08:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] mm/migrate: make sure folio_unlock() before folio_wait_writeback() To: Byungchul Park Cc: Yunseong Kim , Hillf Danton , 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> <20251013043631.GC6925@system.software.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: <20251013043631.GC6925@system.software.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: kh00J4MR1i28_Vc57KBLflUzLnj0hltRqTJIjOKbFg0_1760342926 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: EF6C8120009 X-Stat-Signature: iwnd34fbnu6xfsqtjes55e13mhs9nbmt X-HE-Tag: 1760342930-956353 X-HE-Meta: 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 gpw8GYZ4 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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 13.10.25 06:36, Byungchul Park wrote: > On Tue, Oct 07, 2025 at 09:04:59AM +0200, David Hildenbrand wrote: >> 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 > > Of course, it was an actual deadlock, not just DEPT splat. Okay, so some deadlock was triggered, but not the one described by DEPT, thanks. -- Cheers David / dhildenb