netlink: 20 bytes leftover after parsing attributes in process `syz.2.993'.
------------[ cut here ]------------
!rwb
WARNING: block/blk-wbt.c:785 at wbt_init_enable_default+0x18a/0x220, CPU#0: syz.2.993/9843
Modules linked in:
CPU: 0 UID: 0 PID: 9843 Comm: syz.2.993 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:wbt_init_enable_default+0x18a/0x220
Code: 1c 84 c0 0f 85 8d 00 00 00 41 21 2e eb 1f e8 4d b1 24 fd eb 18 e8 46 b1 24 fd eb 0d e8 3f b1 24 fd 4c 89 ff e8 97 e8 82 fd 90 <0f> 0b 90 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d e9 00 a6 11 07
RSP: 0018:ffffc9000fd3ee30 EFLAGS: 00010282
RAX: ef16b0dff565af00 RBX: 1ffff110045d2604 RCX: 0000000000000046
RDX: 0000000000000006 RSI: ffffffff8defbd8b RDI: ffffffff8c27d580
RBP: dffffc0000000000 R08: ffffffff9011dbb7 R09: 1ffffffff2023b76
R10: dffffc0000000000 R11: fffffbfff2023b77 R12: ffff888022e93020
R13: 0000000000000000 R14: ffff88816ecdc000 R15: ffff888022e93000
FS:  00007f35cf26b6c0(0000) GS:ffff88818de54000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005559593ab950 CR3: 000000016e9ec000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 blk_register_queue+0x382/0x430
 __add_disk+0x677/0xd50
 add_disk_fwnode+0xfb/0x480
 nbd_dev_add+0x72c/0xb50
 nbd_genl_connect+0x962/0x1cf0
 genl_family_rcv_msg_doit+0x22a/0x330
 genl_rcv_msg+0x61c/0x7a0
 netlink_rcv_skb+0x232/0x4b0
 genl_rcv+0x28/0x40
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f35ce39cdd9
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:00007f35cf26b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f35ce616090 RCX: 00007f35ce39cdd9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 000000000000000e
RBP: 00007f35ce432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f35ce616128 R14: 00007f35ce616090 R15: 00007fff72e8eb98
 </TASK>
