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Wed, 15 May 2024 08:55:51 -0700 (PDT) Received: from [172.21.1.2] ([50.204.89.31]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1ef0c038733sm122626045ad.215.2024.05.15.08.55.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 May 2024 08:55:51 -0700 (PDT) Message-ID: Date: Wed, 15 May 2024 17:55:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mm/huge_memory: don't unpoison huge_zero_folio To: Miaohe Lin , akpm@linux-foundation.org Cc: shy828301@gmail.com, nao.horiguchi@gmail.com, xuyu@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240515023607.870022-1-linmiaohe@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: <20240515023607.870022-1-linmiaohe@huawei.com> 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-Rspamd-Queue-Id: 04C2FA0025 X-Stat-Signature: g5s85x9t51xctu5ef8j9wxqczu7eg53z X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1715788564-520944 X-HE-Meta: U2FsdGVkX19mSV4A1KTL1y7+OYRQvTsN8B+fQDaEn5oVprbdTWPxPONKT6c5V/3Rjn13aj91UAV0Rce9+wXW6yT2tTXwi8M5DrsFV6O35R9Aw9gnKf5Z+6ZoYe+d3SWyihG3HmXLQh7GfdWB9colMMAa9YCNF7mtjPI6e4fle0pHLf7YSuwt2Aq31C23SZrEOnj4WESNoF9QYnnQrdVJhquOmC1f6+cH7o1GE5/qi0mnayVvPRvAIDOO25BM2/K7A2haXFCSlCo4nyvN1xMiLDMmGk/lP5MVwIw35zkH7TCGe14JFicSpTMN8N1MJsxF5Pw3U4iSpcATjWyRq47YhB0ZnteGtzfHPGdmaSKyZTHnI7JSDMbinIzIQEIdeY3uaV8HepeFwupDpovI8hwjZM3Tt7pDmk2DsC9ad3h6jsJc/QTUIKgdT623lwUnkg9hK0Mkqj4FBm38qJlJ5NJJqkKlPM3lZQlfpv77AThEiFQDGzTCPWW4JKRKgByElRLk1Dv1s8MuqcCzrIZlZR8jaaPaAFTH8MeHR5GkvWjbLoOqOPyPf32+x4pL8NQO3f2pdlzLMQmn83Nfelh0F8giMOJ0IjiLXXWwladGp16zuhbO22l/4AtIg7WXfXFoZqv0+LprZLdNOUit5siF3BLa5ekA0HvaCfqi2m7X5p2TzUeE9T1RVxNZ/oqvxGvDZKQVcPOSYVpcFtuLMb6kt8W08r0wHQoSySKH6e83Do6k3z5gRfu/fq84ExOgU6Clckqwoj5DqAON4twtZRR5MWkGxCYAhA9dCU1mX19s6a+2nahhK/LCbzYtKX9y/bBxi4ETMFiTq1rZbErnCnRE7Q46vLys2H2JS2ZPWk2pdxGDbyiWN6+/4wuWHx0Id4TkB41Iq7l23ZcHMOcS7quHBHjcW7hJFrMg9g8Jzw+yDSjysOWbYtfYIKOAvklkh+sYCNF6aQiRCcVZslIY52fTS2i A+oqWxAM 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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 15.05.24 04:36, Miaohe Lin wrote: > When I did memory failure tests recently, below panic occurs: > > kernel BUG at include/linux/mm.h:1135! > invalid opcode: 0000 [#1] PREEMPT SMP NOPTI > CPU: 9 PID: 137 Comm: kswapd1 Not tainted 6.9.0-rc4-00491-gd5ce28f156fe-dirty #14 > RIP: 0010:shrink_huge_zero_page_scan+0x168/0x1a0 > RSP: 0018:ffff9933c6c57bd0 EFLAGS: 00000246 > RAX: 000000000000003e RBX: 0000000000000000 RCX: ffff88f61fc5c9c8 > RDX: 0000000000000000 RSI: 0000000000000027 RDI: ffff88f61fc5c9c0 > RBP: ffffcd7c446b0000 R08: ffffffff9a9405f0 R09: 0000000000005492 > R10: 00000000000030ea R11: ffffffff9a9405f0 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: ffff88e703c4ac00 > FS: 0000000000000000(0000) GS:ffff88f61fc40000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000055f4da6e9878 CR3: 0000000c71048000 CR4: 00000000000006f0 > Call Trace: > > do_shrink_slab+0x14f/0x6a0 > shrink_slab+0xca/0x8c0 > shrink_node+0x2d0/0x7d0 > balance_pgdat+0x33a/0x720 > kswapd+0x1f3/0x410 > kthread+0xd5/0x100 > ret_from_fork+0x2f/0x50 > ret_from_fork_asm+0x1a/0x30 > > Modules linked in: mce_inject hwpoison_inject > ---[ end trace 0000000000000000 ]--- > RIP: 0010:shrink_huge_zero_page_scan+0x168/0x1a0 > RSP: 0018:ffff9933c6c57bd0 EFLAGS: 00000246 > RAX: 000000000000003e RBX: 0000000000000000 RCX: ffff88f61fc5c9c8 > RDX: 0000000000000000 RSI: 0000000000000027 RDI: ffff88f61fc5c9c0 > RBP: ffffcd7c446b0000 R08: ffffffff9a9405f0 R09: 0000000000005492 > R10: 00000000000030ea R11: ffffffff9a9405f0 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: ffff88e703c4ac00 > FS: 0000000000000000(0000) GS:ffff88f61fc40000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000055f4da6e9878 CR3: 0000000c71048000 CR4: 00000000000006f0 > > The root cause is that HWPoison flag will be set for huge_zero_folio > without increasing the folio refcnt. But then unpoison_memory() will > decrease the folio refcnt unexpectly as it appears like a successfully > hwpoisoned folio leading to VM_BUG_ON_PAGE(page_ref_count(page) == 0) > when releasing huge_zero_folio. > > Skip unpoisoning huge_zero_folio in unpoison_memory() to fix this issue. > We're not prepared to unpoison huge_zero_folio yet. > > Fixes: 478d134e9506 ("mm/huge_memory: do not overkill when splitting huge_zero_page") > Signed-off-by: Miaohe Lin > Cc: > --- > v2: > Change to simply check for the huge zero page. Thanks. > --- > mm/memory-failure.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/mm/memory-failure.c b/mm/memory-failure.c > index 16ada4fb02b7..68bc8d7ff53d 100644 > --- a/mm/memory-failure.c > +++ b/mm/memory-failure.c > @@ -2558,6 +2558,12 @@ int unpoison_memory(unsigned long pfn) > goto unlock_mutex; > } > > + if (is_huge_zero_folio(folio)) { > + unpoison_pr_info("Unpoison: huge zero page is not supported %#lx\n", > + pfn, &unpoison_rs); > + goto unlock_mutex; > + } > + > if (folio_test_slab(folio) || folio_test_pgtable(folio) || > folio_test_reserved(folio) || folio_test_offline(folio)) > goto unlock_mutex; Acked-by: David Hildenbrand -- Cheers, David / dhildenb