------------[ cut here ]------------
WARNING: CPU: 1 PID: 16611 at include/linux/fs.h:538 i_mmap_assert_write_locked include/linux/fs.h:538 [inline]
WARNING: CPU: 1 PID: 16611 at include/linux/fs.h:538 hugetlb_split+0x237/0x2a0 mm/hugetlb.c:4166
Modules linked in:
CPU: 1 PID: 16611 Comm: syz.6.2700 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:i_mmap_assert_write_locked include/linux/fs.h:538 [inline]
RIP: 0010:hugetlb_split+0x237/0x2a0 mm/hugetlb.c:4166
Code: bf ff 4c 89 f7 48 89 de 4c 89 fa 31 c9 5b 41 5c 41 5d 41 5e 41 5f 5d eb 7a e8 35 7e bf ff 0f 0b e9 62 fe ff ff e8 29 7e bf ff <0f> 0b e9 2d ff ff ff 48 c7 c1 d4 65 6d 8e 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc900033378f0 EFLAGS: 00010287
RAX: ffffffff81b9af67 RBX: 0000200000400000 RCX: 0000000000080000
RDX: ffffc9000fd30000 RSI: 000000000000050e RDI: 000000000000050f
RBP: 0000000000000000 R08: ffff88802cd1b37f R09: 1ffff110059a366f
R10: dffffc0000000000 R11: ffffed10059a3670 R12: ffff888062b061a8
R13: dffffc0000000000 R14: ffff888062b06108 R15: ffff888065d2f840
FS:  00007fa3cce3c6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f73a433c286 CR3: 0000000073b96000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __vma_adjust+0x2da/0x1e30 mm/mmap.c:843
 vma_adjust include/linux/mm.h:2567 [inline]
 __split_vma+0x346/0x410 mm/mmap.c:-1
 userfaultfd_register fs/userfaultfd.c:1453 [inline]
 userfaultfd_ioctl+0x2f93/0x41b0 fs/userfaultfd.c:2000
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fa3cec104d9
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:00007fa3cce3c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa3cee8d090 RCX: 00007fa3cec104d9
RDX: 0000200000000240 RSI: 00000000c020aa00 RDI: 0000000000000006
RBP: 00007fa3cec9f04e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa3cee8d128 R14: 00007fa3cee8d090 R15: 00007ffc704bad58
 </TASK>