------------[ cut here ]------------
WARNING: CPU: 0 PID: 18273 at fs/inode.c:389 inc_nlink+0x121/0x130 fs/inode.c:389
Modules linked in:
CPU: 0 PID: 18273 Comm: syz.4.3560 Not tainted 6.6.94-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:inc_nlink+0x121/0x130 fs/inode.c:389
Code: 43 ea ff e9 3a ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4c ff ff ff 48 89 df e8 19 43 ea ff e9 3f ff ff ff e8 0f 9c 91 ff <0f> 0b eb 82 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 41 57 41
RSP: 0018:ffffc9000447fc28 EFLAGS: 00010283
RAX: ffffffff81f3f9c1 RBX: ffff888056428058 RCX: 0000000000080000
RDX: ffffc9000cb9a000 RSI: 0000000000015290 RDI: 0000000000015291
RBP: 0000000000000000 R08: ffff88805656009b R09: 1ffff1100acac013
R10: dffffc0000000000 R11: ffffed100acac014 R12: dffffc0000000000
R13: 1ffff1100ac8500b R14: ffff888056428000 R15: 0000000000000000
FS:  00007f640db706c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f640db4ef98 CR3: 000000002f829000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 v9fs_vfs_mkdir_dotl+0x624/0x780 fs/9p/vfs_inode_dotl.c:431
 vfs_mkdir+0x296/0x440 fs/namei.c:4113
 do_mkdirat+0x1d4/0x440 fs/namei.c:4136
 __do_sys_mkdirat fs/namei.c:4151 [inline]
 __se_sys_mkdirat fs/namei.c:4149 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4149
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f640cd8e929
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:00007f640db70038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f640cfb5fa0 RCX: 00007f640cd8e929
RDX: 0000000000000003 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f640ce10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f640cfb5fa0 R15: 00007fff909442a8
 </TASK>