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(p200300cbc708e1004f41ff29a59f8c7a.dip0.t-ipconnect.de. [2003:cb:c708:e100:4f41:ff29:a59f:8c7a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436e2e89fc3sm92537865e9.30.2025.01.10.08.31.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jan 2025 08:31:38 -0800 (PST) Message-ID: <51de00af-9860-4617-80d4-8c9818bcce3d@redhat.com> Date: Fri, 10 Jan 2025 17:31:37 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in __folio_rmap_sanity_checks (2) To: Matthew Wilcox Cc: syzbot , akpm@linux-foundation.org, hdanton@sina.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, "Liam R. Howlett" , Lorenzo Stoakes References: <676fee37.050a0220.2f3838.0497.GAE@google.com> From: David Hildenbrand 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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: dU0XXjD6QNXh1lvF63pMjbGR8aM_IHnJZvjy8GKP-jA_1736526700 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: 3kmq79peb6iai1j6yjjkousmk8icbpd5 X-Rspam-User: X-Rspamd-Queue-Id: 9F344C0005 X-Rspamd-Server: rspam08 X-HE-Tag: 1736526704-478526 X-HE-Meta: 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 uh5u6UPK 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000092, 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 10.01.25 17:27, Matthew Wilcox wrote: > On Fri, Jan 10, 2025 at 05:19:54PM +0100, David Hildenbrand wrote: >> On 10.01.25 17:14, Matthew Wilcox wrote: >>> On Fri, Jan 10, 2025 at 04:48:03PM +0100, David Hildenbrand wrote: >>>> If I would have to guess, I would assume that we have a refcount issue such >>>> that we succeed in splitting a folio while concurrently mapping it. >>> >>> That would seem hard to accomplish, because both hold the folio lock, >>> so it wouldn't be just a refcount bug but also a locking bug. Not sure >>> what this is though. >> >> Yeah, but we also have >> >> https://lkml.kernel.org/r/6774bf44.050a0220.25abdd.098a.GAE@google.com > > That one is a UAF on the vma, so it's either a different issue, or the > problem is with the VMA refcount/lookup/..., not the folio refcount. > cc'ing the relevant maintainers. Agreed, it's all a bit confusing. -- Cheers, David / dhildenb