------------[ cut here ]------------
WARNING: CPU: 1 PID: 5765 at include/linux/fs.h:503 i_mmap_assert_write_locked include/linux/fs.h:503 [inline]
WARNING: CPU: 1 PID: 5765 at include/linux/fs.h:503 hugetlb_split+0x234/0x2a0 mm/hugetlb.c:4923
Modules linked in:
CPU: 1 PID: 5765 Comm: syz.0.427 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:i_mmap_assert_write_locked include/linux/fs.h:503 [inline]
RIP: 0010:hugetlb_split+0x234/0x2a0 mm/hugetlb.c:4923
Code: b4 ff 4c 89 f7 48 89 de 4c 89 fa 31 c9 5b 41 5c 41 5d 41 5e 41 5f 5d eb 7d e8 08 7e b4 ff 0f 0b e9 65 fe ff ff e8 fc 7d b4 ff <0f> 0b e9 2d ff ff ff 48 c7 c1 a4 3f 21 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc900035df7e8 EFLAGS: 00010287
RAX: ffffffff81cdb024 RBX: 0000200000400000 RCX: 0000000000080000
RDX: ffffc90004cb9000 RSI: 0000000000000bd3 RDI: 0000000000000bd4
RBP: 0000000000000000 R08: ffff88801746976f R09: 1ffff11002e8d2ed
R10: dffffc0000000000 R11: ffffed1002e8d2ee R12: ffff8880735df730
R13: dffffc0000000000 R14: ffff8880735df6c0 R15: ffff88801a2b4bb8
FS:  00007f15b8e566c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c0 CR3: 000000007d669000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 __vma_adjust+0x553/0x1d00 mm/mmap.c:737
 vma_adjust include/linux/mm.h:2810 [inline]
 __split_vma+0x3a2/0x4f0 mm/mmap.c:-1
 userfaultfd_register fs/userfaultfd.c:1474 [inline]
 userfaultfd_ioctl+0x36d0/0x3f90 fs/userfaultfd.c:2042
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f15b7f9e0d9
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:00007f15b8e56028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f15b8225fa0 RCX: 00007f15b7f9e0d9
RDX: 00002000000001c0 RSI: 00000000c020aa00 RDI: 0000000000000003
RBP: 00007f15b8035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f15b8226038 R14: 00007f15b8225fa0 R15: 00007fffb9abef88
 </TASK>