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b=e69Uc8LtxjwQYibBSKGbRDqg22pA8VRpPKRdSpllo7DCPCp2NC11L4F9JzCRV/VEp flmB2rsG10Wxr5GQ8MnHfa8KXEJMV3NLq2c7RhRDu/wf6LAVUV5zojkBPgzaTq5+rW JNUfMrQ8rTmBW55yCQc4MPHKOI6GP+1H6/aYMrLiG4i1NUSpdBTQWmOB4RBzBy+UoX V1uaMNsCDwTru5ie0KajSCVg887xrHTo+jFtgpNGhVFQn+NG+q8tj9r9XwL6CtvKyn LI3kGflbKQKKP8c0leL863s9nx1BF+fEdcLMBJIjlV+ECaoRtrWRMlpN5n9jqDRUWy Sf78eeCyzvWxQ== Message-ID: Date: Mon, 9 Mar 2026 21:27:32 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: walk_pgd_range BUG: unable to handle page fault From: "David Hildenbrand (Arm)" 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> <05a26f9d-e7eb-4aa4-b5a3-d485945f81c6@kernel.org> <5f4d8780-55f1-4b60-840a-056da7401848@kernel.org> 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: <5f4d8780-55f1-4b60-840a-056da7401848@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 37EC2A0007 X-Rspamd-Server: rspam08 X-Stat-Signature: aimindusgy363m1fda8dwcb99kbcbuau X-HE-Tag: 1773088059-263937 X-HE-Meta: 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 m74PM9QX 8iEayx16m04a2eGNftrxoQdZMHEOuNo9Y8t7+jPsgxsz05cnnzstQGP4Kaj7O52Nc++9Ar1cYVW5zkw+B7RkoJs4VOiUTW80WQbIPUfmZ/9eRikU3PdBD8bwz6oG9PVpg/PDS4un9B1BhAJlJYouBZuhPEE2mK0wsh+udaXhmfOVAs2DcT8nGEazoMdCP1slrHZYvwVW0yu4LZWc4cDcV7UsuspDE3+N+h3UKq0CQlFt0t/QeP8IdwGHLhRIgMtiNjZ9t86V2sa+hPYbzxu2fooDOkWXvdtOyUwwq8dJWcBCYrKACvqu17gWkZjx2mM9tA1NlzMPuBf3BGJGV3/p4/NMiHUdhBtwY1GZFuPLj47pobYLxIjdew64kUA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/5/26 12:40, David Hildenbrand (Arm) wrote: > On 3/5/26 12:39, Tytus Rogalewski wrote: >> I had this problem on 6.19-rc4 yes. I saw it. But i cant reproduce it >> NOW - this is what i ment  :) > > Ah, thanks for clarifying, makes sense! > The following issue might explain the problem: https://lore.kernel.org/r/20260309174949.2514565-1-mboone@akamai.com It would be related to what I recently said: "vfio recently gained support for installing huge mappings into user page tables." smaps_walk_ops() does not have a pud_entry() callback, so we'd try to split (unmap). If that happens concurrently with a refault, we might be able to trigger a BUG. But it wouldn't explain any memory leak. -- Cheers, David