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[37.24.227.121]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-426740d88bcsm174293385e9.1.2024.07.15.09.16.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 15 Jul 2024 09:16:51 -0700 (PDT) Message-ID: <00e18339-d911-4332-8732-e31bcecbf823@redhat.com> Date: Mon, 15 Jul 2024 18:16:50 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/memory-failure: fix VM_BUG_ON_PAGE(PagePoisoned(page)) when unpoison memory To: Miaohe Lin , Andrew Morton Cc: nao.horiguchi@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20240712064249.3882707-1-linmiaohe@huawei.com> <20240712140921.9aa90b18d22e67417d59dfc1@linux-foundation.org> <8fe349f9-d3d3-65ab-6045-da0bd19249ea@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: <8fe349f9-d3d3-65ab-6045-da0bd19249ea@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: mywjr31ih7xxetr8cq3wo4mfoctuixgc X-Rspamd-Queue-Id: 8E39C40014 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1721060216-38916 X-HE-Meta: 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 OmIqZEla l0nYiC1vk8eZi4tE9gG7M+HdOnpinxdeSh09O7Th+dyCuG8N8OoUk4ikdf+TUvdG74wNGFILbzOKaP1STIK4UNpX4v/eQiIi/3J6todq+5Y8TUsIlMtXWJJG4Y98UwUxPPfetOMyWe2aLr6Wkh5mPX2ziTvWE7/C9yxIoKDiDjavHye7YU4NH/RDvnQ6bTWm5XqRhKZPhzSUuNviH55tkjPRGjUoLPCrQ+1dn/Gyvlj4L8cGr5Uqb5rYBlfibNxrh4jP7Ax3V1mfPeGnRupYi9IAU+z50W4zDcw3mjYVx7w5UuYJz2RTkJ3dB1V11Ss3v3qAbq6Uv4x4/7FF6r1erUZpN4w0eViDetNRfvbEdfj+S4AkwuISUxk5NlcOk2UvYHxIZqVrmhclfXzVUDP1MlsqQAsgknDU5RgzbVUSXPso8ZhJ2o8yEs9mbbkmQdtaQ99CX26u5vpQtlZwAtg6Vc60nRLraU6BjwJ5n 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 15.07.24 08:23, Miaohe Lin wrote: > On 2024/7/13 5:09, Andrew Morton wrote: >> On Fri, 12 Jul 2024 14:42:49 +0800 Miaohe Lin wrote: >> >>> When I did memory failure tests recently, below panic occurs: >>> >>> page dumped because: VM_BUG_ON_PAGE(PagePoisoned(page)) >>> kernel BUG at include/linux/page-flags.h:616! >>> Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI >>> CPU: 3 PID: 720 Comm: bash Not tainted 6.10.0-rc1-00195-g148743902568 #40 >>> RIP: 0010:unpoison_memory+0x2f3/0x590 >>> RSP: 0018:ffffa57fc8787d60 EFLAGS: 00000246 >>> RAX: 0000000000000037 RBX: 0000000000000009 RCX: ffff9be25fcdc9c8 >>> RDX: 0000000000000000 RSI: 0000000000000027 RDI: ffff9be25fcdc9c0 >>> RBP: 0000000000300000 R08: ffffffffb4956f88 R09: 0000000000009ffb >>> R10: 0000000000000284 R11: ffffffffb4926fa0 R12: ffffe6b00c000000 >>> R13: ffff9bdb453dfd00 R14: 0000000000000000 R15: fffffffffffffffe >>> FS: 00007f08f04e4740(0000) GS:ffff9be25fcc0000(0000) knlGS:0000000000000000 >>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> CR2: 0000564787a30410 CR3: 000000010d4e2000 CR4: 00000000000006f0 >>> Call Trace: >>> >>> unpoison_memory+0x2f3/0x590 >>> simple_attr_write_xsigned.constprop.0.isra.0+0xb3/0x110 >>> debugfs_attr_write+0x42/0x60 >>> full_proxy_write+0x5b/0x80 >>> vfs_write+0xd5/0x540 >>> ksys_write+0x64/0xe0 >>> do_syscall_64+0xb9/0x1d0 >>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>> RIP: 0033:0x7f08f0314887 >>> RSP: 002b:00007ffece710078 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 >>> RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007f08f0314887 >>> RDX: 0000000000000009 RSI: 0000564787a30410 RDI: 0000000000000001 >>> RBP: 0000564787a30410 R08: 000000000000fefe R09: 000000007fffffff >>> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009 >>> R13: 00007f08f041b780 R14: 00007f08f0417600 R15: 00007f08f0416a00 >>> >>> Modules linked in: hwpoison_inject >>> ---[ end trace 0000000000000000 ]--- >>> RIP: 0010:unpoison_memory+0x2f3/0x590 >>> RSP: 0018:ffffa57fc8787d60 EFLAGS: 00000246 >>> RAX: 0000000000000037 RBX: 0000000000000009 RCX: ffff9be25fcdc9c8 >>> RDX: 0000000000000000 RSI: 0000000000000027 RDI: ffff9be25fcdc9c0 >>> RBP: 0000000000300000 R08: ffffffffb4956f88 R09: 0000000000009ffb >>> R10: 0000000000000284 R11: ffffffffb4926fa0 R12: ffffe6b00c000000 >>> R13: ffff9bdb453dfd00 R14: 0000000000000000 R15: fffffffffffffffe >>> FS: 00007f08f04e4740(0000) GS:ffff9be25fcc0000(0000) knlGS:0000000000000000 >>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> CR2: 0000564787a30410 CR3: 000000010d4e2000 CR4: 00000000000006f0 >>> Kernel panic - not syncing: Fatal exception >>> Kernel Offset: 0x31c00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) >>> ---[ end Kernel panic - not syncing: Fatal exception ]--- >>> >>> The root cause is that unpoison_memory() tries to check the PG_HWPoison >>> flags of an uninitialized page. So VM_BUG_ON_PAGE(PagePoisoned(page)) is >>> triggered. >> >> I'm not seeing the call path. Is this BUG happening via >> >> static __always_inline void __ClearPage##uname(struct page *page) \ >> { \ >> VM_BUG_ON_PAGE(!Page##uname(page), page); \ >> page->page_type |= PG_##lname; \ >> } >> >> ? >> >> If so, where's the callsite? > > It is BUG on PF_ANY(): > > PAGEFLAG(HWPoison, hwpoison, PF_ANY) > > #define PF_ANY(page, enforce) PF_POISONED_CHECK(page) > > #define PF_POISONED_CHECK(page) ({ \ > VM_BUG_ON_PGFLAGS(PagePoisoned(page), page); \ > page; }) > > #define PAGE_POISON_PATTERN -1l > static inline int PagePoisoned(const struct page *page) > { > return READ_ONCE(page->flags) == PAGE_POISON_PATTERN; > } > > The offlined pages will have page->flags set to PAGE_POISON_PATTERN while pfn is still valid: > > offline_pages > remove_pfn_range_from_zone > page_init_poison > memset(page, PAGE_POISON_PATTERN, size); Worth noting that this happens after __offline_isolated_pages() marked the covering sections as offline. Are we missing a pfn_to_online_page() check somewhere, or are we racing with offlining code that marks the section offline? -- Cheers, David / dhildenb