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b=J4KeQgPVE2hE46eWU/JJEsLoTYy+n1udO+5vPv7pV6dITFlmyku5Q7UI6/Pqt9PBI WccdtQSU5v7TRTA5xv3dj8Dy04VSWdOEUg3VqbxDONyFhXxcHPx9FUAFKeH9Czj6+i SG8yRtBsk586nBcliYGLpcUUp//d32MCzyax0zWAgEWkblzmBoAjcnsq17agPUtlR1 ZQUqvj1Oh43Z72XGk88R6cobm3wtiP6m+QrjUQyI2vurjy6ttYYvhjrUfZ2thoKlQE l8+WgBTWdXePjRCITX0DBW0SuUWSKMUCRpgDakEBx2rU6U2IgQwhTQbl1PTU6TJec3 a4G3ytIKEUUWg== Message-ID: Date: Wed, 4 Feb 2026 18:12:39 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: WARNING in memory_failure() at include/linux/huge_mm.h:635 triggered To: =?UTF-8?B?5piv5Y+C5beu?= , "linux-mm@kvack.org" Cc: "linmiaohe@huawei.com" , "akpm@linux-foundation.org" , "linux-kernel@vger.kernel.org" , Zi Yan , Matthew Wilcox References: From: "David Hildenbrand (arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: DCF961C0004 X-Stat-Signature: uqy3rqtbqn8ndgkxg7xy5s6cgffmw7kr X-Rspam-User: X-HE-Tag: 1770225163-557505 X-HE-Meta: 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 jF6/2ADM aTur0saUkkru3hHzMqejlrMDZ40YtXfqQ9De9rYj8ZqwyuRzvUwbj1xjS9UTNJXz6k69YdwF1ZJ3aS7B0DpkRovogBdzEPBRLa4lH6Fy3EaLIONzu8lCdKuCL4N4pJfzEE0rv2m3rmNBv98H1Hn+QOiXRjJOV5miCx7fNxhEV3kIh0KEAr4ZILv+l1l46Iqa3/eUzfKmBUYtvHwOtJaWh1U1EH/9edIHqhetMFhzwxMNUZ/c7sIi8OpZMm5jbuTlMGVumUarxuU6/hF7fyL7Wdzv9XB0H6+FK6waIsC88nc2nBUrHND37nwAjhQDS2bG0EpMcZArgoDtS/4OeOcWlQe+/P0jhf/shFoIZ+NVpzIwLGsOk/Ju8CWTcU2Hdi5c62qtkrYrIyg20b3k= 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 2/4/26 13:49, 是参差 wrote: > Hi, > I’m reporting a reproducible WARNING triggered in the hwpoison / memory_failure path when injecting a hardware-poison event via madvise(MADV_HWPOISON). > > The warning is triggered by a syzkaller C reproducer that: > maps a file-backed region with MAP_FIXED, touches related VMAs, and then > calls madvise() with MADV_HWPOISON over a large range. > The kernel reports a VM_WARN_ON_ONCE_FOLIO(1) from memory_failure() and points to include/linux/huge_mm.h:635, suggesting an unexpected folio/page state encountered while handling a poisoned compound/huge folio. > > The target page appears to be a compound head page (order:3) already marked hwpoison. memory_failure() seems to reach a branch that unconditionally warns (VM_WARN_ON_ONCE_FOLIO(1) at include/linux/huge_mm.h:635), which usually indicates an “unreachable”/unexpected folio type or state transition in the huge/compound folio handling logic during hwpoison processing. > > This looks like a kernel-side invariant violation rather than a pure userspace misuse, since the warning is emitted from an unconditional VM_WARN_ON_ONCE_FOLIO(1) site. > > Reproducer: > C reproducer: https://pastebin.com/raw/UxennX2B > console output: https://pastebin.com/raw/wrhKRwZY > kernel config: https://pastebin.com/raw/dP93yBLn > > Kernel: > > HEAD commit: 63804fed149a6750ffd28610c5c1c98cce6bd377 > >  git tree: torvalds/linux > > kernel version: 6.19.0-rc7  (QEMU Ubuntu 24.10) @Zi Yan, this is weird. We run into the VM_WARN_ON_ONCE_FOLIO(1, folio); in min_order_for_split(), which is only active with !CONFIG_TRANSPARENT_HUGEPAGE. But how do we get a large folio in that case? folio_test_large(folio) succeeded. I think we rules out hugetlb before in that function. Looking into the full console output, this is an order-3 folio (fully mapped). How do we end up with a large folio here? I am only aware of that happening when something would allocate an order-3 compound page (not a folio) and map it into the page tables. Yes, that is nasty and can still happen, not sure yet though whether that is really what the reproducer triggers. [ 451.810860] Injecting memory failure for pfn 0xfe28 at process virtual address 0x200000000000 [ 451.812878] page: refcount:10 mapcount:1 mapping:0000000000000000 index:0xffff88800fe2e600 pfn:0xfe28 [ 451.814740] head: order:3 mapcount:8 entire_mapcount:0 nr_pages_mapped:8 pincount:0 [ 451.816263] flags: 0x200044(referenced|head|hwpoison|zone=0) [ 451.817414] raw: 0000000000200044 0000000000000000 dead000000000122 0000000000000000 [ 451.818924] raw: ffff88800fe2e600 0000000000000000 0000000a00000000 0000000000000000 [ 451.820422] head: 0000000000200044 0000000000000000 dead000000000122 0000000000000000 [ 451.821835] head: ffff88800fe2e600 0000000000000000 0000000a00000000 0000000000000000 [ 451.823276] head: 0000000000000003 ffffea00003f8a01 0000000800000007 00000000ffffffff [ 451.824701] head: ffff88800fe29e00 0000000000000000 0000000000000000 0000000000000008 [ 451.826113] page dumped because: VM_WARN_ON_ONCE_FOLIO(1) > > > head: 0000000000000003 ffffea00003f8a01 0000000800000007 00000000ffffffff > head: ffff88800fe29e00 0000000000000000 0000000000000000 0000000000000008 > page dumped because: VM_WARN_ON_ONCE_FOLIO(1) > ------------[ cut here ]------------ > WARNING: include/linux/huge_mm.h:635 at min_order_for_split include/linux/huge_mm.h:635 [inline], CPU#0: syz.3.7564/25556 > WARNING: include/linux/huge_mm.h:635 at min_order_for_split include/linux/huge_mm.h:633 [inline], CPU#0: syz.3.7564/25556 > WARNING: include/linux/huge_mm.h:635 at memory_failure+0x22e8/0x2950 mm/memory-failure.c:2434, CPU#0: syz.3.7564/25556 > CPU: 0 UID: 0 PID: 25556 Comm: syz.3.7564 Not tainted 6.19.0-rc7 #1 VOLUNTARY > Hardware name: QEMU Ubuntu 24.10 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > RIP: 0010:min_order_for_split include/linux/huge_mm.h:635 [inline] > RIP: 0010:min_order_for_split include/linux/huge_mm.h:633 [inline] > RIP: 0010:memory_failure+0x22e8/0x2950 mm/memory-failure.c:2434 > Code: ff 84 db 0f 85 f1 f5 ff ff e9 36 fe ff ff e8 3f 55 ce ff 48 c7 c6 e0 f7 ee 85 4c 89 f7 e8 90 b6 ed ff c6 05 13 35 04 06 01 90 <0f> 0b 90 e9 aa ee ff ff e8 eb 15 fe ff e9 65 e1 ff ff e8 a1 15 fe > RSP: 0018:ffff888000b7fa00 EFLAGS: 00010216 > RAX: 00000000000066f1 RBX: 0000000000000000 RCX: ffffc90004fbb000 > RDX: 0000000000080000 RSI: ffff888029a3c500 RDI: 0000000000000002 > RBP: ffffea00003f8a00 R08: fffffbfff0ddc501 R09: ffffffff819105e0 > R10: 0000000000000001 R11: ffff888000b7f7e7 R12: 000000000000fe28 > R13: ffffea00003f8a00 R14: ffffea00003f8a00 R15: ffffea00003f8a08 > FS: 00007f3d36d7f6c0(0000) GS:0000000000000000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f3d384a3828 CR3: 00000000589a9000 CR4: 0000000000350ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 > Call Trace: > > madvise_inject_error mm/madvise.c:1489 [inline] > madvise_do_behavior.part.0+0x137/0x3c0 mm/madvise.c:1927 > madvise_do_behavior+0x41d/0x5d0 mm/madvise.c:979 > do_madvise+0x134/0x1b0 mm/madvise.c:2030 > __do_sys_madvise mm/madvise.c:2039 [inline] > __se_sys_madvise mm/madvise.c:2037 [inline] > __x64_sys_madvise+0xa8/0x110 mm/madvise.c:2037 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xa9/0x320 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x4b/0x53 > RIP: 0033:0x7f3d3831ebe9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f3d36d7f038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c > RAX: ffffffffffffffda RBX: 00007f3d38555fa0 RCX: 00007f3d3831ebe9 > RDX: 0000000000000064 RSI: 0000000000600000 RDI: 0000200000000000 > RBP: 00007f3d383a1e19 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f3d38556038 R14: 00007f3d38555fa0 R15: 00007ffe8f52e9d8 > > ---[ end trace 0000000000000000 ]--- -- Cheers, David