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[2003:cb:c739:600:d2fb:3a8a:9944:7910]) by smtp.gmail.com with ESMTPSA id v11-20020a05600c470b00b0041a963bf2cdsm25306wmo.36.2024.04.22.03.07.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 22 Apr 2024 03:07:43 -0700 (PDT) Message-ID: <71cf84d4-77d2-42d7-a649-b67497b171f6@redhat.com> Date: Mon, 22 Apr 2024 12:07:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in __page_table_check_ptes_set To: syzbot , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pasha.tatashin@soleen.com, syzkaller-bugs@googlegroups.com References: <000000000000ca4df20616a0fe16@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: <000000000000ca4df20616a0fe16@google.com> X-Mimecast-Spam-Score: 1 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-Server: rspam05 X-Rspamd-Queue-Id: 26DAB4000B X-Stat-Signature: 7bgght3hwbzaf8wzimj5mrcw8cd969ab X-HE-Tag: 1713780467-532603 X-HE-Meta: U2FsdGVkX18qvSo9a4R+hkVYn7+BtFaZAGvAfteGYr2hmiaDrqB3wUXRLWhbExhTqYAcJ5CH73XklaVGLR31tAQ1PK08Dd/zb4V+E9pDuqQM+HKucE1N3enQLfp/fK6bVMQzlUS9vfYE0YrVPulqsvt9Kgnn9RYx9R3cZszPzP/psdylTAwm2Ws5feS/zn8ByD61UQQlcmDSVpVG7gc+3gIZFrc3DBIj6QUQcHbZDwOt5UOtVnWGc4OhkIY3qsYSDrZQ37aNg6doNwgecwQheI2SgVYp5mELkuduh4ylgggQIP28i3TBs3Ijr7x5HBgxYbii7eOungrD97Ymc62/cQeq8DhUIug62JptWRPLIDyrcvI38ASMDe+9hpdEFz+bFmJJjYi/vZcWTo2l60NaRkKsInFuWOeG1WcNSIqNRaSuVwC3ft8XgLSQglFcSS4iJZcOZf4p9TwnyEriuQUV/TpFeYb065sXw6iddhmH5nDl/h2fTCIIHNbdMMQIk/6AUGthpZSyfYXTj2zzEhJGzU0f04/CWZYDLzD7KcwIypsmJr2ZtX/CrHERGYeBb6l9Szfe0+OeSuEGF2j7pWSBaV2rKMY3AbPNJyvdmLf3o9iabmTOnE+kn5SCroVZhKGab41cQq+ZgpAZEvXZmzh1iPtDF1wTKSjCdV9sjKJwLo/iudrxvgkeMYA73w1j6yEJt720rTOdVF9ub15aoLbP3xDD2ws38LT9bNS1GHMov62czF5WqNHsNN+v6L0zl45LkaceC9gCgRvi2pF8vN6Vyr1oztc5bMku2JRPR35oWTZ2Xp5LEer5zt+j8ls0XBUChXxg1QwRZT49pqTYzlh5MCkvsdvnDDFHTaPOxBl1UCUH95Ran5kHl4egYhJj27RirrRDkHcziAEq+RPkD2ZRkNuo4Mu48DLwPOcI4TrjUwBZCWCzNdjbnXkm1lfuwnCxRlrtV0PICLlImQU2xxR Ze7olUkn 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 2nt+uxMw NfBr9JYCY1oRta4O1p8roTcqEKRuuysOCbhxEE/19ArLqVb1QcnwJVCGgYxGiyEykI0a+M82xrkaK0Jw9qSkG/pl0zIsdPuuP/k4KO6zjd+qbQx1X1Ni3s1sP6CqRB/+HsvG6vIjMvlDGemDqDTlxswYW9THMPH1wHDajwxAQ7zAh1fl7gAcSZpjebbkTQOwlvG+kiJUY3bdzuPAiw0WeQ== 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 21.04.24 22:16, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 4eab35893071 Add linux-next specific files for 20240417 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=1727a61b180000 > kernel config: https://syzkaller.appspot.com/x/.config?x=27920e47287645ff > dashboard link: https://syzkaller.appspot.com/bug?extid=d8426b591c36b21c750e > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=156da22d180000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=163dfec7180000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/9f7d6c097fb4/disk-4eab3589.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/287b16352982/vmlinux-4eab3589.xz > kernel image: https://storage.googleapis.com/syzbot-assets/23839c65c573/bzImage-4eab3589.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+d8426b591c36b21c750e@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 5084 at mm/page_table_check.c:199 __page_table_check_pte mm/page_table_check.c:199 [inline] > WARNING: CPU: 0 PID: 5084 at mm/page_table_check.c:199 __page_table_check_ptes_set+0x1db/0x420 I think this is if (pte_present(pte) && pte_uffd_wp(pte)) WARN_ON_ONCE(pte_write(pte)); mm/page_table_check.c:213 > Modules linked in: > CPU: 0 PID: 5084 Comm: syz-executor382 Not tainted 6.9.0-rc4-next-20240417-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 > RIP: 0010:__page_table_check_pte mm/page_table_check.c:199 [inline] > RIP: 0010:__page_table_check_ptes_set+0x1db/0x420 mm/page_table_check.c:213 > Code: 48 8b 7c 24 40 48 c7 c6 80 19 46 8e e8 ee df 8e ff 41 83 fc 1d 74 18 41 83 fc 1a 75 1d e8 5d da 8e ff eb 10 e8 56 da 8e ff 90 <0f> 0b 90 eb 10 e8 4b da 8e ff 90 0f 0b 90 eb 05 e8 40 da 8e ff 48 > RSP: 0018:ffffc9000366f740 EFLAGS: 00010293 > RAX: ffffffff8207833a RBX: ffffc9000366f7c0 RCX: ffff888022af3c00 > RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000 > RBP: ffffc9000366f830 R08: ffffffff820782af R09: 1ffffd40000a6a10 > R10: dffffc0000000000 R11: fffff940000a6a11 R12: 0000000000000000 > R13: 0000000014d42c67 R14: 0000000000000001 R15: 0000000000000000 > FS: 0000555567f79380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000000066c7e0 CR3: 0000000078cb0000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > page_table_check_ptes_set include/linux/page_table_check.h:74 [inline] > set_ptes include/linux/pgtable.h:267 [inline] > __ptep_modify_prot_commit include/linux/pgtable.h:1269 [inline] > ptep_modify_prot_commit include/linux/pgtable.h:1302 [inline] > change_pte_range mm/mprotect.c:194 [inline] > change_pmd_range mm/mprotect.c:424 [inline] > change_pud_range mm/mprotect.c:457 [inline] > change_p4d_range mm/mprotect.c:480 [inline] > change_protection_range mm/mprotect.c:508 [inline] > change_protection+0x2770/0x3cc0 mm/mprotect.c:542 > mprotect_fixup+0x740/0xa90 mm/mprotect.c:655 > do_mprotect_pkey+0x90d/0xe00 mm/mprotect.c:820 > __do_sys_mprotect mm/mprotect.c:841 [inline] > __se_sys_mprotect mm/mprotect.c:838 [inline] > __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:838 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f45514bf429 > Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffe52191598 EFLAGS: 00000246 ORIG_RAX: 000000000000000a > RAX: ffffffffffffffda RBX: 00007ffe52191768 RCX: 00007f45514bf429 > RDX: 000000000000000f RSI: 0000000000004000 RDI: 0000000020ffc000 > RBP: 00007f4551532610 R08: 00007ffe52191768 R09: 00007ffe52191768 > R10: 00007ffe52191768 R11: 0000000000000246 R12: 0000000000000001 > R13: 00007ffe52191758 R14: 0000000000000001 R15: 0000000000000001 > Did we find a real issue that involves mprotect()? At least can_change_pte_writable() should always return "false" for userfaultfd_pte_wp(). Do we maybe have a uffd-wp PTE outside of a UFFD_WP VMA? Or was the PTE already writable and we only detect it now as we call mprotect()? (missed to detect it earlier?) > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup > -- Cheers, David / dhildenb