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[2003:d8:2f27:ec00:4f4d:d38:ba97:9aa2]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a4efe5b962sm23296810f8f.7.2025.06.04.23.27.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Jun 2025 23:27:44 -0700 (PDT) Message-ID: Date: Thu, 5 Jun 2025 08:27:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] kernel BUG in try_to_unmap_one (2) From: David Hildenbrand To: syzbot , Liam.Howlett@oracle.com, akpm@linux-foundation.org, harry.yoo@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, riel@surriel.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, Jens Axboe , Catalin Marinas References: <68412d57.050a0220.2461cf.000e.GAE@google.com> <4fc2c008-2384-4d94-b1bf-f0a076585a4a@redhat.com> 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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <4fc2c008-2384-4d94-b1bf-f0a076585a4a@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: y3JhAQUL2GUTELMM-yRwURKN2s29XzUErybSKd6zNog_1749104865 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-Queue-Id: 1BEDD40007 X-Rspamd-Server: rspam09 X-Stat-Signature: qkgxi43478s455dgtp8itpt5tu1pe94b X-HE-Tag: 1749104869-902017 X-HE-Meta: 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 OVAjJJiM 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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 05.06.25 08:11, David Hildenbrand wrote: > On 05.06.25 07:38, syzbot wrote: >> Hello, >> >> syzbot found the following issue on: >> >> HEAD commit: d7fa1af5b33e Merge branch 'for-next/core' into for-kernelci > > Hmmm, another very odd page-table mapping related problem on that tree > found on arm64 only: In this particular reproducer we seem to be having MADV_HUGEPAGE and io_uring_setup() be racing with MADV_HWPOISON, MADV_PAGEOUT and io_uring_register(IORING_REGISTER_BUFFERS). I assume the issue is related to MADV_HWPOISON, MADV_PAGEOUT and io_uring_register racing, only. I suspect MADV_HWPOISON is trying to split a THP, while MADV_PAGEOUT tries paging it out. IORING_REGISTER_BUFFERS ends up in io_sqe_buffers_register->io_sqe_buffer_register where we GUP-fast and try coalescing buffers. And something about THPs is not particularly happy :) -- Cheers, David / dhildenb