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[2003:cb:c708:e100:4f41:ff29:a59f:8c7a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436e2dc08bbsm90707445e9.12.2025.01.10.08.35.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jan 2025 08:35:25 -0800 (PST) Message-ID: Date: Fri, 10 Jan 2025 17:35:25 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in __folio_rmap_sanity_checks (2) To: Hillf Danton , syzbot Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <20241231084108.1146-1-hdanton@sina.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: <20241231084108.1146-1-hdanton@sina.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: LTr3iUxMYa-z5mI8nLymTRAacgAT0CdUPlx-voj6i7E_1736526927 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 93A5640003 X-Rspam-User: X-Stat-Signature: 568rz1xf8tjgptq185o1ejfsxwdadfxm X-HE-Tag: 1736526930-553922 X-HE-Meta: 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 OMe1GUpE 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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 31.12.24 09:41, Hillf Danton wrote: > On Fri, 27 Dec 2024 20:56:21 -0800 >> syzbot has found a reproducer for the following issue on: >> >> HEAD commit: 8155b4ef3466 Add linux-next specific files for 20241220 >> git tree: linux-next >> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1652fadf980000 > > #syz test > > --- x/mm/filemap.c > +++ y/mm/filemap.c > @@ -3636,6 +3636,10 @@ static vm_fault_t filemap_map_folio_rang > continue; > skip: > if (count) { > + for (unsigned int i = 0; i < count; i++) { > + if (page_folio(page + i) != folio) > + goto out; > + } IIRC, count <= nr_pages. Wouldn't that mean that we somehow pass in nr_pages that already exceeds the given folio+start? When I last looked at this, I was not able to spot the error in the caller :( > set_pte_range(vmf, folio, page, count, addr); > *rss += count; > folio_ref_add(folio, count); > @@ -3658,6 +3662,7 @@ skip: > ret = VM_FAULT_NOPAGE; > } > > +out: > vmf->pte = old_ptep; > > return ret; > @@ -3702,7 +3707,7 @@ vm_fault_t filemap_map_pages(struct vm_f > struct file *file = vma->vm_file; > struct address_space *mapping = file->f_mapping; > pgoff_t file_end, last_pgoff = start_pgoff; > - unsigned long addr; > + unsigned long addr, pmd_end; > XA_STATE(xas, &mapping->i_pages, start_pgoff); > struct folio *folio; > vm_fault_t ret = 0; > @@ -3731,6 +3736,12 @@ vm_fault_t filemap_map_pages(struct vm_f > if (end_pgoff > file_end) > end_pgoff = file_end; > > + /* make vmf->pte[x] valid */ > + pmd_end = ALIGN(addr, PMD_SIZE); > + pmd_end = (pmd_end - addr) >> PAGE_SHIFT; > + if (end_pgoff - start_pgoff > pmd_end) > + end_pgoff = start_pgoff + pmd_end; > + do_fault_around() comments "This way it's easier to guarantee that we don't cross page table boundaries." It does some magic with PTRS_PER_PTE. You're diff here seems to indicate that this is not the case? But it's rather surprising that we see these issues pop up just now in -next. -- Cheers, David / dhildenb