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Sun, 01 Feb 2026 22:40:25 -0800 (PST) MIME-Version: 1.0 From: =?UTF-8?B?5p2O6b6Z5YW0?= Date: Mon, 2 Feb 2026 14:40:14 +0800 X-Gm-Features: AZwV_Qgaw8B5AxJeCN-ynW6mxh99f059KgFB43y3qxaO4uIMlwNDckMSmuezWnk Message-ID: Subject: [Kernel Bug] WARNING in mempool_alloc_noprof To: syzkaller@googlegroups.com, vbabka@suse.cz, akpm@linux-foundation.org, cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, harry.yoo@oracle.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: ED59B140006 X-Stat-Signature: fhm4ai9wx9quix75zbkhco55111ktkzw X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1770014426-839230 X-HE-Meta: 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 1A5dSVkn 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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: Dear Linux kernel developers and maintainers, We would like to report a new kernel bug found by our tool. WARNING in mempool_alloc_noprof. Details are as follows. Kernel commit: v6.12.11 Kernel config: see attachment report: see attachment We are currently analyzing the root cause and working on a reproducible PoC. We will provide further updates in this thread as soon as we have more information. Best regards, Longxing Li ------------[ cut here ]------------ WARNING: CPU: 1 PID: 362734 at mm/page_alloc.c:4234 __alloc_pages_slowpath mm/page_alloc.c:4234 [inline] WARNING: CPU: 1 PID: 362734 at mm/page_alloc.c:4234 __alloc_pages_noprof+0x2025/0x25a0 mm/page_alloc.c:4766 Modules linked in: CPU: 1 UID: 0 PID: 362734 Comm: syz-executor.5 Not tainted 6.12.11 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:__alloc_pages_slowpath mm/page_alloc.c:4234 [inline] RIP: 0010:__alloc_pages_noprof+0x2025/0x25a0 mm/page_alloc.c:4766 Code: 10 00 00 00 44 8b 74 24 48 41 89 c5 0f b6 c0 44 8b a4 24 84 00 00 00 89 44 24 28 e9 e5 f6 ff ff 90 0f 0b 90 e9 f1 f6 ff ff 90 <0f> 0b 90 e9 1e fb ff ff e8 2e a4 38 09 e9 5e ed ff ff 4c 89 f7 e8 RSP: 0000:ffffc9003ce9e7d0 EFLAGS: 00010246 RAX: 0000000000008000 RBX: 0000000000000000 RCX: ffffc9003ce9e8fc RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88813fff99c8 RBP: 0000000000000000 R08: 000000000000028d R09: 0000000000000000 R10: ffff88807fffbc17 R11: 0000000000000000 R12: 000000000009a800 R13: 000000000009a800 R14: 1ffff920079d3d0e R15: 0000000000000001 FS: 00007f1784eff640(0000) GS:ffff888135e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bb25a85a28 CR3: 0000000096938000 CR4: 0000000000752ef0 PKRU: 55555554 Call Trace: alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 mempool_alloc_noprof+0x176/0x390 mm/mempool.c:402 fscrypt_alloc_bounce_page+0x28/0x60 fs/crypto/crypto.c:59 fscrypt_encrypt_pagecache_blocks.cold+0x567/0x6da fs/crypto/crypto.c:202 f2fs_encrypt_one_page+0x187/0x630 fs/f2fs/data.c:2516 f2fs_do_write_data_page+0x7b4/0x1900 fs/f2fs/data.c:2706 f2fs_write_single_data_page+0x1454/0x1c30 fs/f2fs/data.c:2872 f2fs_write_cache_pages+0xd6e/0x24e0 fs/f2fs/data.c:3166 __f2fs_write_data_pages fs/f2fs/data.c:3321 [inline] f2fs_write_data_pages+0x4af/0xdd0 fs/f2fs/data.c:3348 do_writepages+0x1a3/0x7f0 mm/page-writeback.c:2683 filemap_fdatawrite_wbc mm/filemap.c:398 [inline] filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:388 __filemap_fdatawrite_range+0xb3/0xf0 mm/filemap.c:431 file_write_and_wait_range+0xca/0x140 mm/filemap.c:788 f2fs_do_sync_file+0x2dc/0x1ed0 fs/f2fs/file.c:278 f2fs_sync_file+0x13a/0x1a0 fs/f2fs/file.c:395 vfs_fsync_range+0x136/0x220 fs/sync.c:188 generic_write_sync include/linux/fs.h:2871 [inline] f2fs_file_write_iter+0x12ba/0x2370 fs/f2fs/file.c:5057 new_sync_write fs/read_write.c:590 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:683 ksys_write+0x12f/0x260 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x471ecd Code: c3 e8 17 28 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1784eff058 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000059bf80 RCX: 0000000000471ecd RDX: 0000000000000002 RSI: 00000000200003c0 RDI: 0000000000000004 RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000059bf8c R13: 000000000000000b R14: 000000000059bf80 R15: 00007f1784edf000 https://drive.google.com/file/d/17HbDTI_iPjA72SkV5MnO-_w7IQZ9HIHW/view?usp=drive_link https://drive.google.com/file/d/19pMiWedcVz8nFrj9jiJXuCjyPbNjYQqq/view?usp=drive_link