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Mon, 13 May 2024 08:40:50 -0700 (PDT) Received: from [172.21.1.2] ([50.204.89.31]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-634103f6a80sm6887309a12.74.2024.05.13.08.40.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 13 May 2024 08:40:49 -0700 (PDT) Message-ID: <1ca64fc3-1b96-466e-aa25-a8f9f6805edc@redhat.com> Date: Mon, 13 May 2024 17:40:49 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/huge_memory: mark huge_zero_folio reserved 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: <20240511032801.1295023-1-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: <20240511032801.1295023-1-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-Stat-Signature: 8r8bf1reohzb6kjq964kwe6ei4ray7ad X-Rspamd-Queue-Id: C257D80006 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1715615157-333380 X-HE-Meta: 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 +McYEZc3 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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 11.05.24 05:28, 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. > > Fix this issue by marking huge_zero_folio reserved. So unpoison_memory() > will skip this page. This will make it consistent with ZERO_PAGE case too. > > Fixes: 478d134e9506 ("mm/huge_memory: do not overkill when splitting huge_zero_page") > Signed-off-by: Miaohe Lin > Cc: > --- > mm/huge_memory.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 317de2afd371..d508ff793145 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -212,6 +212,7 @@ static bool get_huge_zero_page(void) > folio_put(zero_folio); > goto retry; > } > + __folio_set_reserved(zero_folio); We want to limit/remove the use of PG_reserve. Please find a different way (e.g., simply checking for the huge zero page directly). -- Cheers, David / dhildenb