------------[ cut here ]------------
WARNING: CPU: 0 PID: 7926 at fs/inode.c:474 inc_nlink+0x122/0x150
Modules linked in:
CPU: 0 UID: 0 PID: 7926 Comm: syz.6.246 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:inc_nlink+0x122/0x150
Code: e7 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 c9 e7 e7 ff e9 3f ff ff ff e8 5f 76 84 ff 90 <0f> 0b 90 eb 80 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 50 ff ff ff
RSP: 0018:ffffc900034ff4e0 EFLAGS: 00010287
RAX: ffffffff823b3881 RBX: ffff888121cec088 RCX: 0000000000080000
RDX: ffffc90020031000 RSI: 0000000000001510 RDI: 0000000000001511
RBP: 0000000000000000 R08: ffffffff8fa3a037 R09: 1ffffffff1f47406
R10: dffffc0000000000 R11: fffffbfff1f47407 R12: dffffc0000000000
R13: 1ffff1102439d811 R14: ffff888121cec040 R15: ffff888121cec110
FS:  00007f1911f006c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000395c6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 minix_mkdir+0x44/0x120
 vfs_mkdir+0x306/0x510
 ovl_workdir_create+0x4c3/0x8b0
 ovl_get_workdir+0x32f/0x17c0
 ovl_fill_super+0x1365/0x35b0
 get_tree_nodev+0xbb/0x150
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x2a2/0x9e0
 __se_sys_mount+0x317/0x410
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1910f8eba9
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:00007f1911f00038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f19111d5fa0 RCX: 00007f1910f8eba9
RDX: 0000200000000b80 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007f1911011e19 R08: 0000200000000200 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f19111d6038 R14: 00007f19111d5fa0 R15: 00007ffd1fa00cc8
 </TASK>
