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AJvYcCV6R35XAG/qDOS8WKAYvFz64gxEku3SZvbJGg9ePxJaPtxz27canxy9ieqN3MWMyYNrZJ2l342R3uX1t8k=@vger.kernel.org X-Gm-Message-State: AOJu0Yw8aySvL/ICcE/3ugnRUAgsEa0H2/KybtF4G3fVyb3b7Z9DiQE2 pa7Z22zDmamiLEUtTyyIlozUjI5ZhasfExU9RC+q5OsTjcNDFrRIFfd0Qve0AW/xL/hWUGxjWbi CHRHzpLwDiR3avKDDUqOmpQV7yKIuyd8Mz6nEqiWKkVmo2iBwLD8nFlVK/mU= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1628:b0:67e:3ae6:9031 with SMTP id 006d021491bc7-67fabd01024mr1125354eaf.59.1775023707158; Tue, 31 Mar 2026 23:08:27 -0700 (PDT) Date: Tue, 31 Mar 2026 23:08:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69ccb65b.050a0220.183828.003a.GAE@google.com> Subject: [syzbot] [mm?] WARNING in deferred_split_folio From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, baohua@kernel.org, baolin.wang@linux.alibaba.com, david@kernel.org, dev.jain@arm.com, lance.yang@linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, npache@redhat.com, ryan.roberts@arm.com, syzkaller-bugs@googlegroups.com, ziy@nvidia.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: cf7c3c02fdd0 Add linux-next specific files for 20260330 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=154ee46a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3944d875fa9bfb67 dashboard link: https://syzkaller.appspot.com/bug?extid=a7067a757858ac8eb085 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c846ba580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/053d3b49a360/disk-cf7c3c02.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/faabb37d41d0/vmlinux-cf7c3c02.xz kernel image: https://storage.googleapis.com/syzbot-assets/8d47fe92aaa8/bzImage-cf7c3c02.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a7067a757858ac8eb085@syzkaller.appspotmail.com free_pages_and_swap_cache+0x2b9/0x490 mm/swap_state.c:401 __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline] tlb_batch_pages_flush mm/mmu_gather.c:151 [inline] tlb_flush_mmu_free mm/mmu_gather.c:417 [inline] tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:424 tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:549 exit_mmap+0x498/0x9e0 mm/mmap.c:1313 __mmput+0x118/0x430 kernel/fork.c:1177 exit_mm+0x18e/0x250 kernel/exit.c:581 do_exit+0x6a2/0x22c0 kernel/exit.c:962 do_group_exit+0x21b/0x2d0 kernel/exit.c:1116 __do_sys_exit_group kernel/exit.c:1127 [inline] __se_sys_exit_group kernel/exit.c:1125 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1125 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ 1 WARNING: mm/huge_memory.c:4371 at deferred_split_folio+0x974/0xaa0 mm/huge_memory.c:4371, CPU#1: syz.3.1110/10500 Modules linked in: CPU: 1 UID: 0 PID: 10500 Comm: syz.3.1110 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:deferred_split_folio+0x974/0xaa0 mm/huge_memory.c:4371 Code: 31 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 c2 67 8d 09 cc e8 8c 73 93 ff 48 89 df 48 c7 c6 20 5b fc 8b e8 dd 2b f5 fe 90 <0f> 0b 90 e9 d4 fe ff ff e8 9f 7a 8a 09 e8 6a 73 93 ff 48 89 df 48 RSP: 0018:ffffc900047ef540 EFLAGS: 00010046 RAX: 1c05fb65cfaab100 RBX: ffffea0001840000 RCX: 0000000080000001 RDX: 0000000000000002 RSI: ffffffff8e4da1c7 RDI: ffff88807d6f9e80 RBP: ffffc900047ef610 R08: ffff8880b87247d3 R09: 1ffff110170e48fa R10: dffffc0000000000 R11: ffffed10170e48fb R12: ffffea0001840040 R13: 0000000000000000 R14: 0000000000010000 R15: 1ffff920008fdeb0 FS: 00007f32e32a76c0(0000) GS:ffff8881250e8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5825757930 CR3: 0000000034ad8000 CR4: 00000000003526f0 Call Trace: migrate_folio_move mm/migrate.c:1411 [inline] migrate_folios_move mm/migrate.c:1740 [inline] migrate_pages_batch+0x319f/0x4c40 mm/migrate.c:1996 migrate_pages_sync mm/migrate.c:2026 [inline] migrate_pages+0x1c74/0x2a10 mm/migrate.c:2135 do_mbind mm/mempolicy.c:1614 [inline] kernel_mbind mm/mempolicy.c:1757 [inline] __do_sys_mbind mm/mempolicy.c:1831 [inline] __se_sys_mbind+0xe89/0x10f0 mm/mempolicy.c:1827 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f32e239c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f32e32a7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed RAX: ffffffffffffffda RBX: 00007f32e2616090 RCX: 00007f32e239c819 RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000200000001000 RBP: 00007f32e2432c91 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f32e2616128 R14: 00007f32e2616090 R15: 00007ffe30c61cc8 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup