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b=Iqnz9UMlga0okF1l0c78suFZFQqYyb/ObiOdyh+5jt9rAwZC0OV+2JSpzQFp4Dm8d tNPT/9KgLPaoglwZUx3ptPjCPh3TtIYbdrb/EHKwrp/rOCW3Ltp3fWWNzXVoUsgX1Q zqrawh25u4vR/w28ZPvRyBvjYsbon7qmiWdxfTxQoPcByhyrVh76yfPPCjTH6hkHMV uxJZEv46cyMr1O34mR4cyBWx6L96nNfAbGujhe+6Jr5ojCFODvgSkDaVPXpRmDB7rB 43dbF/Z/RDsCrFz9cDuxdUT/Q79YIc5xkssqVBHTrmtMDzooAvR6G+nKc1lu6zZ7qZ xsrzNfIOjOMZw== Message-ID: <397f60ab-4a3d-438f-a7db-4c598af13f1c@kernel.org> Date: Tue, 18 Aug 2026 19:20:58 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm, swap: ratelimit bad swap entry reports To: Breno Leitao , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , Miaohe Lin , Oscar Salvador Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, stable@vger.kernel.org References: <20260818-swap_part_one-v1-1-a4fc58119fc0@debian.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+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: <20260818-swap_part_one-v1-1-a4fc58119fc0@debian.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: 193dw1j5bqwghiz99gzsgua4didhhf8k X-Rspamd-Queue-Id: 1DBC920003 X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1787073665-802647 X-HE-Meta: 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 JzHT7kh4 hLtuFBnDXR1q0RwGYJprZxkgxW3DWx2JE+cd65qStduJqCQL+Zhx2HxpBTZiM6o1gQ4fnw2UzYCUULZ26OJEFhKrcQgNl/R9eN1iRp8SifKHf2xJMZJqeXcod0CDVP+xQ3Dui81MY8jQAdqhveiHgH2ymDlACwRG3sRNVEcucwWYfkvjBfJTQWF3bSCrkF71Q64MD29wSBGQ58QPzNYleqwEL0uKE1k6+LQPyOvH2KIegHxc0r7tmr5ce+7Cn/ETheX2qzS9EVPmM6wY4ueJ9JQu6cX/ZbwASuCR7kJI4UyERW3+DewqZLotbaJYKCfjYqPerbfSxx/U49k9aXAcqEPQPVWkuyz8CEW92aIBVQRrXvbwABu28T3uQXCii19ep0G3q2iqLw4gkS+WB8IpTNMHRkA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/18/26 11:03, Breno Leitao wrote: > A corrupt page table hands the same bogus entry to get_swap_device() on > every access to the mapping, and every rejection is logged. One machine > logged 6185620 copies of the same line in a few hours. > > swap_dup_entry_direct() prints the same message from the fork path, once > per call: the WARN_ON_ONCE() guarding it warns once, the pr_err() inside > does not. > > Rate limit all three prints. > > Cc: stable@vger.kernel.org > Fixes: 23b230ba8ac3 ("mm/swap: print bad swap offset entry in get_swap_device") > Reviewed-by: Barry Song > Reviewed-by: Nhat Pham > Acked-by: Kairui Song > Signed-off-by: Breno Leitao > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David