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[2003:cb:c718:1300:9860:66a2:fe4d:c379]) by smtp.gmail.com with ESMTPSA id v19-20020a05600c471300b004157ff88ad7sm12426642wmo.7.2024.04.08.00.44.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Apr 2024 00:44:20 -0700 (PDT) Message-ID: <669695d1-b374-4a2e-9f8e-1bf95725ba70@redhat.com> Date: Mon, 8 Apr 2024 09:44:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm,swapops: Update check in is_pfn_swap_entry for hwpoison entries To: Oscar Salvador , Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Miaohe Lin , Peter Xu , stable@vger.kernel.org, Tony Luck References: <20240407130537.16977-1-osalvador@suse.de> 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: <20240407130537.16977-1-osalvador@suse.de> X-Mimecast-Spam-Score: 0 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: mqby7krhz4apwu8mboc6pzhcw6ue3jhb X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 71CB98000B X-Rspam-User: X-HE-Tag: 1712562264-646815 X-HE-Meta: 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 myMJF5Vl zbLo00NbtaOxduI6pmyLmr+NdU3waZc7iRITo0irlaIsdxcoxd1eikQl5qZ/lBJI1BuhxR544wkiaHT6wbXoc3Atl8JXFcoQ0pSCuDtSG0xIr3OQApyYW8pZPjgXNTXvm71V+TEfYu7oaNI3rrMnFMczwPmkkd1hquAmQggDvIIh8cbTwIEybk/bLu1swrwnBDjE/P/BVDDdy4YrAcnN7zjmU5w== 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 07.04.24 15:05, Oscar Salvador wrote: > Tony reported that the Machine check recovery was broken in v6.9-rc1, > as he was hitting a VM_BUG_ON when injecting uncorrectable memory errors > to DRAM. > After some more digging and debugging on his side, he realized that this > went back to v6.1, with the introduction of 'commit 0d206b5d2e0d ("mm/swap: add > swp_offset_pfn() to fetch PFN from swap entry")'. > That commit, among other things, introduced swp_offset_pfn(), replacing > hwpoison_entry_to_pfn() in its favour. > > The patch also introduced a VM_BUG_ON() check for is_pfn_swap_entry(), > but is_pfn_swap_entry() never got updated to cover hwpoison entries, which > means that we would hit the VM_BUG_ON whenever we would call > swp_offset_pfn() for such entries on environments with CONFIG_DEBUG_VM set. > Fix this by updating the check to cover hwpoison entries as well, and update > the comment while we are it. > > Reported-by: Tony Luck > Closes: https://lore.kernel.org/all/Zg8kLSl2yAlA3o5D@agluck-desk3/ > Tested-by: Tony Luck > Fixes: 0d206b5d2e0d ("mm/swap: add swp_offset_pfn() to fetch PFN from swap entry") > Cc: # 6.1.x > Signed-off-by: Oscar Salvador > --- Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb