__kernel_write_iter+0x428/0x910 fs/read_write.c:619
 __kernel_write fs/read_write.c:639 [inline]
 kernel_write+0x1ca/0x2e0 fs/read_write.c:660
 process_sysctl_arg+0x39c/0x5f0 fs/proc/proc_sysctl.c:1687
 parse_one kernel/params.c:153 [inline]
 parse_args+0x310/0xa70 kernel/params.c:186
 do_sysctl_args+0xd0/0x150 fs/proc/proc_sysctl.c:1719
 kernel_init+0x84/0x1d0 init/main.c:1492
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page_owner free stack trace missing
------------[ cut here ]------------
kernel BUG at mm/filemap.c:154!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 9943 Comm: syz.4.972 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: a3 c9 ff 48 89 df 48 c7 c6 60 3e 94 8b e8 e3 f1 31 ff 90 0f 0b e8 5b a3 c9 ff 48 89 df 48 c7 c6 40 3d 94 8b e8 cc f1 31 ff 90 <0f> 0b e8 44 a3 c9 ff 48 89 df 48 c7 c6 60 3e 94 8b e8 b5 f1 31 ff
RSP: 0018:ffffc900037fee20 EFLAGS: 00010046
RAX: 91c6c20e713ea300 RBX: ffffea0005008000 RCX: 91c6c20e713ea300
RDX: 0000000000000005 RSI: ffffffff8dba996e RDI: ffff888033631e00
RBP: 0000000000000001 R08: ffff8880b8724253 R09: 1ffff110170e484a
R10: dffffc0000000000 R11: ffffed10170e484b R12: 0000000000000040
R13: 1ffffd4000a01000 R14: 1ffffd4000a01001 R15: ffffea0005008008
FS:  00007f425f5d36c0(0000) GS:ffff888125d13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002d030 CR3: 0000000023ab0000 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: 0033:0x7f426178eec9
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:00007f425f5d3038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f42619e6270 RCX: 00007f426178eec9
RDX: 0000000000000009 RSI: 0000000000600002 RDI: 0000200000000000
RBP: 00007f4261811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f42619e6308 R14: 00007f42619e6270 R15: 00007f4261b0fa28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:filemap_unaccount_folio+0x715/0x790 mm/filemap.c:154
Code: a3 c9 ff 48 89 df 48 c7 c6 60 3e 94 8b e8 e3 f1 31 ff 90 0f 0b e8 5b a3 c9 ff 48 89 df 48 c7 c6 40 3d 94 8b e8 cc f1 31 ff 90 <0f> 0b e8 44 a3 c9 ff 48 89 df 48 c7 c6 60 3e 94 8b e8 b5 f1 31 ff
RSP: 0018:ffffc900037fee20 EFLAGS: 00010046
RAX: 91c6c20e713ea300 RBX: ffffea0005008000 RCX: 91c6c20e713ea300
RDX: 0000000000000005 RSI: ffffffff8dba996e RDI: ffff888033631e00
RBP: 0000000000000001 R08: ffff8880b8724253 R09: 1ffff110170e484a
R10: dffffc0000000000 R11: ffffed10170e484b R12: 0000000000000040
R13: 1ffffd4000a01000 R14: 1ffffd4000a01001 R15: ffffea0005008008
FS:  00007f425f5d36c0(0000) GS:ffff888125d13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002d030 CR3: 0000000023ab0000 CR4: 00000000003526f0