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[87.161.166.165]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a53229d9ddsm1084220f8f.4.2025.06.06.00.40.25 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 06 Jun 2025 00:40:26 -0700 (PDT) Message-ID: Date: Fri, 6 Jun 2025 09:40:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] kernel BUG in try_to_unmap_one (2) To: Jinjiang Tu , 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> <37e77dc4-bc73-2710-088f-f7ec0c787caf@huawei.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: <37e77dc4-bc73-2710-088f-f7ec0c787caf@huawei.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: sAr66WCl2mghlpLP8_Srgz1NmYnSxlBB6U99cx9XPKU_1749195627 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 721A714000B X-Stat-Signature: 7z91e5ef3knpm817oeet18f9bdywyq9g X-Rspam-User: X-HE-Tag: 1749195630-701624 X-HE-Meta: U2FsdGVkX19MKqZvfd900jq6CMV95/rW0bxefgVItbtVW+NzLhxYKH1oWNa3cb/4p4KEAu33+BHIEikTtkKiLvOQn7iYc24jCYTEdC9xZyKqNL0LEQCvQ0hgLSIl2CI/xhvCrokeL6/jImQH9QUtN/5TQ+2k6kbRyyeZtMpJRxCnyKcyejcK3XKOsDMJDwfLJ0v2w7vnJA+hj07MLnCkB8ZhY7giLBTGKtPk7z8STdAb2Vwkg7rH0FPmemAmVI4nzVrhIUKQYn2Rrw0JaUUY+ReA+MI/NzFbAnPrweYPxtwypS9JIGljRn/b5ZM4FttDFI4T+QHjwrPRHNQyqnExfdZeFD7BD5dLZkexdn3yd93wT1GzvHaYIo+LM9gtePlDiLxcpIPKrjhevkCgcogEqsSoK1TK16iP/AGdU5W42E26ZcDkS2ZNefZ91AE51bUh2bGOcFtNJJiYQXrlG8m5FXfaSly+T//2Vv4lC0VUanehzOMt+4NiQ4CikHoJP5GbsRSkFAENMJwWTvVKqVWLWXbtrt6uLF6Eow8HD9RHg0wDwl37iSd/7yi/CLBjjpewxGNLT6dUaTBx65iwF88RVKiu68N6Pg+vSNtSsu5abinrsycQBtaSoVLVr2ZWOMgu+tumWk4xzRGa4auWH7QO0Jj7m9UnwA6O9A7P+qSIPX959GsddhxCu74iVNP2SsfpQmIwnO2wmMH0TtUc6BCb/0q/JczcIwJCus8cPCbyhM6AQ1oXry3GtW8kkgvuBljV7XbeKvnuFQUrlb1rEnUpefisWewlqoyjYPRACkMyWdXe71hgeADK1CjKMjh++Iblmnp0ZRcNuKr24UFY1fqdkU4ZW+VoN5Xvn64mWfk2lu+axiELP9QZO7z7qEcANhNbHJyAVk2mJGxrPFLIgYuhvVNFf1N+PnyYpDh0sG+VpFsmxUN4HV7I3avtgygoV6WlrS8aZOgjZARYpAApA6y 3Rj2RfYp 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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 09:37, Jinjiang Tu wrote: > > 在 2025/6/5 14:37, David Hildenbrand 写道: >> On 05.06.25 08:27, David Hildenbrand wrote: >>> 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 :) >>> >> >> Not sure if realted to io_uring. >> >> unmap_poisoned_folio() calls try_to_unmap() without TTU_SPLIT_HUGE_PMD. >> >> When called from memory_failure(), we make sure to never call it on a >> large folio: WARN_ON(folio_test_large(folio)); >> >> However, from shrink_folio_list() we might call unmap_poisoned_folio() >> on a large folio, which doesn't work if it is still PMD-mapped. Maybe >> passing TTU_SPLIT_HUGE_PMD would fix it. >> >> >> Likely the relevant commit is: >> >> commit 1b0449544c6482179ac84530b61fc192a6527bfd >> Author: Jinjiang Tu >> Date:   Tue Mar 18 16:39:39 2025 +0800 >> >>     mm/vmscan: don't try to reclaim hwpoison folio >>         Syzkaller reports a bug as follows: >>         Injecting memory failure for pfn 0x18b00e at process virtual >> address 0x20ffd000 >>     Memory failure: 0x18b00e: dirty swapcache page still referenced by >> 2 users >>     Memory failure: 0x18b00e: recovery action for dirty swapcache >> page: Failed >>     page: refcount:2 mapcount:0 mapping:0000000000000000 index:0x20ffd >> pfn:0x18b00e >>     memcg:ffff0000dd6d9000 >>     anon flags: >> 0x5ffffe00482011(locked|dirty|arch_1|swapbacked|hwpoison|node=0|zone=2|lastcpupid=0xfffff) >>     raw: 005ffffe00482011 dead000000000100 dead000000000122 >> ffff0000e232a7c9 >>     raw: 0000000000020ffd 0000000000000000 00000002ffffffff >> ffff0000dd6d9000 >>     page dumped because: VM_BUG_ON_FOLIO(!folio_test_uptodate(folio)) >> >> CCing Jinjiang Tu > > By the way, unmap_poisoned_folio() is called in do_migrate_range() too. the folio may be in lru and is a large folio. Indeed. -- Cheers, David / dhildenb