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[2003:d8:2f02:2900:f54f:bad7:c5f4:9404]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43f23572c4esm156784745e9.26.2025.04.13.13.20.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 13 Apr 2025 13:20:18 -0700 (PDT) Message-ID: Date: Sun, 13 Apr 2025 22:20:17 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in do_wp_page To: syzbot , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com References: <67fab4fe.050a0220.2c5fcf.0011.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: <67fab4fe.050a0220.2c5fcf.0011.GAE@google.com> X-Mimecast-Spam-Score: 1 X-Mimecast-MFC-PROC-ID: JcJvogZQ9ng6ucVk9NND1CVRNx6HnxQaTDtx23jU6cc_1744575619 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 2FC20C0006 X-Rspamd-Server: rspam05 X-Rspam-User: X-Stat-Signature: wrbyanynmwwdcj4zaewgzb5wt5p3tjij X-HE-Tag: 1744575621-645201 X-HE-Meta: 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 +j/k4RvN szzrLMXgU0CHUzLCgUx6mxq9fs9TIEbuqJWtACk4bVo9sCE2CHjd7bLc10BpM84dWTvUBofSdNIM0At9MVXejBmtKbCphqeYR9Z9frQkickGwdHuqkiLKDihj52MoRSTLnDpoMFVsl6VyAK3VmbpdM156OhDtnjcWFPLvPTaVl5VDLKttHb820FU9mejxi+6UWxpYtnFue925vWLx3cHZ87CjVFCSjiWVYy/s5WCcBcyErufdwgfhOTKfYkqJTmZi3Ku2McCflViNjviaghyuMgyCJtt7oOhvNDBbCroVBqacqVJkzUVKaBZmIE9KNaUXdpSt/PnPLNXc/jQivUzo5+icLnxavg9vQxvAj9jZnU8e9tCbrB8cauMPhg== 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 12.04.25 20:46, syzbot wrote: > Hello, > > syzbot found the following issue on: Related to my recent changes > > HEAD commit: 0af2f6be1b42 Linux 6.15-rc1 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1766323f980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f175b153b655dbb3 CONFIG_ARCH_WANTS_THP_SWAP=y CONFIG_MM_ID=y CONFIG_TRANSPARENT_HUGEPAGE=y # CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS is not set CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y # CONFIG_TRANSPARENT_HUGEPAGE_NEVER is not set CONFIG_THP_SWAP=y CONFIG_READ_ONLY_THP_FOR_FS=y # CONFIG_NO_PAGE_MAPCOUNT is not set CONFIG_PAGE_MAPCOUNT=y > dashboard link: https://syzkaller.appspot.com/bug?extid=5e8feb543ca8e12e0ede > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/f1d71d1bf77d/disk-0af2f6be.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/7f1638f065da/vmlinux-0af2f6be.xz > kernel image: https://storage.googleapis.com/syzbot-assets/9b3e49834705/bzImage-0af2f6be.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+5e8feb543ca8e12e0ede@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 7165 at mm/memory.c:3738 __wp_can_reuse_large_anon_folio mm/memory.c:3738 [inline] VM_WARN_ON_ONCE(folio_entire_mapcount(folio)); Which is rather unexpected. I know we had a scenario (remapping a THP?) where we would have a PMD mapping and a PTE mapping of an exclusive anon folio for a very short time. But, IIRC locking should make sure that that cannot be observed by some other page table walker. Unfortunately o reproducer. I'll do some digging ... > WARNING: CPU: 0 PID: 7165 at mm/memory.c:3738 wp_can_reuse_anon_folio mm/memory.c:3788 [inline] > WARNING: CPU: 0 PID: 7165 at mm/memory.c:3738 do_wp_page+0x4c62/0x59f0 mm/memory.c:3918 > Modules linked in: > CPU: 0 UID: 0 PID: 7165 Comm: syz.3.280 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 > RIP: 0010:__wp_can_reuse_large_anon_folio mm/memory.c:3738 [inline] > RIP: 0010:wp_can_reuse_anon_folio mm/memory.c:3788 [inline] > RIP: 0010:do_wp_page+0x4c62/0x59f0 mm/memory.c:3918 > Code: 48 89 ef e8 50 c3 ea ff e9 62 b8 ff ff e8 c6 e0 b4 ff 48 c7 c6 20 43 9b 8b 4c 89 e7 e8 f7 a0 fc ff 90 0f 0b e8 af e0 b4 ff 90 <0f> 0b 90 e9 df ed ff ff e8 a1 e0 b4 ff 48 c7 c6 60 46 9b 8b 48 89 > RSP: 0018:ffffc900039f77e0 EFLAGS: 00010287 > RAX: 0000000000041ec0 RBX: ffffc900039f7a00 RCX: ffffc9000d0c6000 > RDX: 0000000000080000 RSI: ffffffff82065c61 RDI: 0000000000000005 > RBP: ffffea0001320000 R08: 0000000000000005 R09: 00000000ffffffff > R10: 0000000000000000 R11: 0000000000000000 R12: ffff888012935dc0 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 > FS: 00007f57215806c0(0000) GS:ffff8881249b9000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000020000001e000 CR3: 000000006cd88000 CR4: 0000000000350ef0 > Call Trace: > > handle_pte_fault mm/memory.c:6013 [inline] > __handle_mm_fault+0x1ada/0x2a40 mm/memory.c:6140 > handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 > faultin_page mm/gup.c:1193 [inline] > __get_user_pages+0x771/0x36f0 mm/gup.c:1491 > populate_vma_page_range+0x278/0x3a0 mm/gup.c:1929 > __mm_populate+0x1d8/0x380 mm/gup.c:2032 > do_mlock+0x448/0x810 mm/mlock.c:655 During do_mlock() we should be holding the mmap lock in write mode I assume once we reach do_wp_page. -- Cheers, David / dhildenb