arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
kernel BUG at mm/filemap.c:154!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 21929 Comm: syz.4.4357 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:filemap_unaccount_folio+0x715/0x790 mm/filemap.c:154
Code: a4 c9 ff 48 89 df 48 c7 c6 e0 3b 94 8b e8 63 f1 31 ff 90 0f 0b e8 2b a4 c9 ff 48 89 df 48 c7 c6 c0 3a 94 8b e8 4c f1 31 ff 90 <0f> 0b e8 14 a4 c9 ff 48 89 df 48 c7 c6 e0 3b 94 8b e8 35 f1 31 ff
RSP: 0018:ffffc90003e4ee20 EFLAGS: 00010046
RAX: 3c2c21241fd7c000 RBX: ffffea0000f60000 RCX: 3c2c21241fd7c000
RDX: 0000000000000005 RSI: ffffffff8dba8b31 RDI: ffff888026ba8000
RBP: 0000000000000001 R08: ffff8880b8724253 R09: 1ffff110170e484a
R10: dffffc0000000000 R11: ffffed10170e484b R12: 0000000000000040
R13: 1ffffd40001ec000 R14: 1ffffd40001ec001 R15: ffffea0000f60008
FS:  00007f92f07f26c0(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000087030 CR3: 0000000061a8e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __filemap_remove_folio+0xc3/0x500 mm/filemap.c:223
 filemap_remove_folio+0xe6/0x1f0 mm/filemap.c:253
 hugetlb_delete_from_page_cache fs/hugetlbfs/inode.c:331 [inline]
 remove_inode_single_folio fs/hugetlbfs/inode.c:536 [inline]
 remove_inode_hugepages+0x594/0x1100 fs/hugetlbfs/inode.c:593
 hugetlbfs_punch_hole fs/hugetlbfs/inode.c:716 [inline]
 hugetlbfs_fallocate+0xbc7/0x1100 fs/hugetlbfs/inode.c:742
 vfs_fallocate+0x669/0x7e0 fs/open.c:342
 madvise_remove mm/madvise.c:1049 [inline]
 madvise_vma_behavior+0x3254/0x3af0 mm/madvise.c:1346
 madvise_walk_vmas+0x51c/0xa30 mm/madvise.c:1669
 madvise_do_behavior+0x38e/0x550 mm/madvise.c:1885
 do_madvise+0x1bc/0x270 mm/madvise.c:1978
 __do_sys_madvise mm/madvise.c:1987 [inline]
 __se_sys_madvise mm/madvise.c:1985 [inline]
 __x64_sys_madvise+0xa7/0xc0 mm/madvise.c:1985
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f92ef98eba9
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:00007f92f07f2038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f92efbd6270 RCX: 00007f92ef98eba9
RDX: 0000000000000009 RSI: 0000000000600002 RDI: 0000200000000000
RBP: 00007f92efa11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f92efbd6308 R14: 00007f92efbd6270 R15: 00007f92efcffa28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:filemap_unaccount_folio+0x715/0x790 mm/filemap.c:154
Code: a4 c9 ff 48 89 df 48 c7 c6 e0 3b 94 8b e8 63 f1 31 ff 90 0f 0b e8 2b a4 c9 ff 48 89 df 48 c7 c6 c0 3a 94 8b e8 4c f1 31 ff 90 <0f> 0b e8 14 a4 c9 ff 48 89 df 48 c7 c6 e0 3b 94 8b e8 35 f1 31 ff
RSP: 0018:ffffc90003e4ee20 EFLAGS: 00010046
RAX: 3c2c21241fd7c000 RBX: ffffea0000f60000 RCX: 3c2c21241fd7c000
RDX: 0000000000000005 RSI: ffffffff8dba8b31 RDI: ffff888026ba8000
RBP: 0000000000000001 R08: ffff8880b8724253 R09: 1ffff110170e484a
R10: dffffc0000000000 R11: ffffed10170e484b R12: 0000000000000040
R13: 1ffffd40001ec000 R14: 1ffffd40001ec001 R15: ffffea0000f60008
FS:  00007f92f07f26c0(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000087030 CR3: 0000000061a8e000 CR4: 00000000003526f0