------------[ cut here ]------------
WARNING: CPU: 1 PID: 4724 at include/linux/fs.h:503 i_mmap_assert_write_locked include/linux/fs.h:503 [inline]
WARNING: CPU: 1 PID: 4724 at include/linux/fs.h:503 hugetlb_split+0x234/0x2a0 mm/hugetlb.c:4920
Modules linked in:
CPU: 1 PID: 4724 Comm: syz.4.79 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:i_mmap_assert_write_locked include/linux/fs.h:503 [inline]
RIP: 0010:hugetlb_split+0x234/0x2a0 mm/hugetlb.c:4920
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 98 98 b4 ff 0f 0b e9 65 fe ff ff e8 8c 98 b4 ff <0f> 0b e9 2d ff ff ff 48 c7 c1 e4 40 20 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc90005dc77e8 EFLAGS: 00010283
RAX: ffffffff81cdee24 RBX: 0000200000400000 RCX: 0000000000080000
RDX: ffffc9000e09b000 RSI: 0000000000000bad RDI: 0000000000000bae
RBP: 0000000000000000 R08: ffff88807c96446f R09: 1ffff1100f92c88d
R10: dffffc0000000000 R11: ffffed100f92c88e R12: ffff88802f3d4df0
R13: dffffc0000000000 R14: ffff88802f3d4d80 R15: ffff88807843a6b8
FS:  00007f871eec96c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000080 CR3: 000000007b47c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __vma_adjust+0x4a3/0x1cd0 mm/mmap.c:737
 vma_adjust include/linux/mm.h:2810 [inline]
 __split_vma+0x3a7/0x500 mm/mmap.c:-1
 userfaultfd_register fs/userfaultfd.c:1466 [inline]
 userfaultfd_ioctl+0x39c2/0x4250 fs/userfaultfd.c:2034
 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: 0033:0x7f871df9ce59
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:00007f871eec9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f871e215fa0 RCX: 00007f871df9ce59
RDX: 0000200000000040 RSI: 00000000c020aa00 RDI: 0000000000000004
RBP: 00007f871e032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f871e216038 R14: 00007f871e215fa0 R15: 00007ffd2471c6a8
 </TASK>