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b=mZLmbjWGB64TSEztFsrdq0OFDIdi0u/hlzldqvi3QPwzvNgr4fg7+7YnYY18CP/KO TqlQ0DCI7yhA511oXbEMPbIyvSdqW6emMWUpKadjg/sUsKijaqChmNGvby8VAK/tJc XAq/2obg6itIz0zDbhyHRdEBkJ87FDIMCSPfbQrsv0JVRrssDhlgL29dmHp/fnaj2Y AB1y9koIB/02bIsLRYOL9h7BrtPLxHqj3xEOLca3AzkAcni3pcnK8LDG3DfkbFh1VD Wnu3DR3y+GOe+HMtRaxg3OLYSdpWSIYbqfFclekYLBao+Rn/a+stujJFo/fOzPm4bz gqUK96zHS1svA== Message-ID: <44967e53-d514-4323-b41d-8f672db0f97e@kernel.org> Date: Mon, 9 Mar 2026 22:15:15 +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: <0dfd588c-3284-4310-b1cd-aab54567f0c0@kernel.org> <05a26f9d-e7eb-4aa4-b5a3-d485945f81c6@kernel.org> <5f4d8780-55f1-4b60-840a-056da7401848@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: 8bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: B9666C0009 X-Stat-Signature: 69e7fsw1p4wtnf6mhansx6w78jcgaadx X-Rspam-User: X-HE-Tag: 1773090922-95673 X-HE-Meta: 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 klNNsYXn Vjy8xu/HJ1ZzFWemxKl9sfXmXSk75BXPtXgD5IykchvkjxsRFTuMdTgEtN/mbp29lWpRSoAemFzJkszwnQIJgGamoFApwwZhxNsfWqA3irxO0e5zWnUVfOaUOo0KPDKFYfsWJcT7N9pPT5HB8Egc/5IpWh0LBIiEJAfypOmy4eNPzTOa3NyaibQcmrNHzZB77GYtrz5t0gZbvmn7+GPAua/cSGfSwm4lrzJA5MEGxWCk/3QVZxHYc2gF6KJP7blpA7RlwPZrDwWJc5pJ0D3tpDGhVlEXuX/rvkCjCZNA9CUTIC2dnYRHHE66BgGVI9AGcZrNUd7H3cUOXOV8= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/9/26 21:42, Tytus Rogalewski wrote: > Hi, > > Well it seemed "like mem leak" but honestly it was my bad assumption i > guess. > > And does it correlate with io_uring somehow ? Not really :/ > Because i have no such issues when using threads mode in proxmox with > network drive that is on fuse. > Could be that triggered perhaps when someone was writing hard to his > disk and that would cause other fuse drives to hung for few secs and > that would trigger that BUG ? I'm rather wondering whether something involving io_uring could make the kernel reschedule more often, possibly in the race window that the issue I linked describes. > And using threads somehow fixes that issue ? Does that make any sense ? Maybe with io_uring there could be more threads, the question is how many io-threads QEMU would be using in your setup. Hard to tell. -- Cheers, David