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b=blyCeddbhXH09i9sDmRdbban0y+/dhur0vU3rcQjQgPZ1eg1/J82ULhk5U6PISSos GJAMAfiMiOnNsO8bpszR3tjaE8QS7JHv2OmaKeV6LRvNkWWbjw8HQFt4DKmugPwKHG 5J72IdDlzfw+dbx+rWLDxz2tDH7Zh/R51II6rN8Kd9uUwk+tdp4nFXDUpheL8rqKiT Hpf3cPxFbSauzExBq3uNorsi6gPgPsisBYaPqCrWDSYN46ZlzcWuyV0tH6Ot8dDWDn OxKUsM0x8T3LazwLLHfPIttL5NVJU3h/DtXWIcaF7kwttN9FwM+DseimjULsTJYfyl ibm3lEvSiMZkQ== Message-ID: <05a26f9d-e7eb-4aa4-b5a3-d485945f81c6@kernel.org> Date: Thu, 5 Mar 2026 12:38:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: walk_pgd_range BUG: unable to handle page fault To: Tytus Rogalewski Cc: linux-mm@kvack.org, muchun.song@linux.dev, osalvador@suse.de, Jens Axboe References: <5948f3a6-8f30-4c45-9b86-2af9a6b37405@kernel.org> <0dfd588c-3284-4310-b1cd-aab54567f0c0@kernel.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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 7FE5180002 X-Rspamd-Server: rspam08 X-Stat-Signature: pxbi1m6wayg48rsr1zyg3sp653s41f6r X-HE-Tag: 1772710698-240132 X-HE-Meta: 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 JDmJlG+c /YVdV0sa8zIfKhnHKk47vIshcKd0OOOciI6Uw+Gf6XhQ7hrSgD6A0zE55Viqvzt2dZjelq5jjHuq1t+9n5e0CecYFQ2Wi8W388CqmdqTzWlQZMh22Yas08m5ths9M4rPxjdMWp5BlM5u1QGM7SuAJdAteFZhEEkXqEEKBb0Sh5Rxb8x4RL6BSh/+PIJYCaScygollBciiMSRe4TiuBudtluZFG06av/gKkjdz8rFJ3nzr/e4x9AhZ9BSCCm+qE74/6N4sCBY2P0ItI5v87A7aFHpO6hKihxBHsaDBgznEFAK1yeU= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/5/26 12:34, Tytus Rogalewski wrote: > Well, i would better not as i would have to put this on production as i > have no idea how clients are triggering this in their VMs. > Cant trigger this myself. I'm confused, during your first mail you wrote "It happens on multiple servers (less on 6.18.6, more on 6.19-rc4+)", implying that you did reproduce the problem on 6.19-rc4+? -- Cheers, David