netlink: 20 bytes leftover after parsing attributes in process `syz.4.451'.
------------[ cut here ]------------
WARNING: block/blk-wbt.c:741 at wbt_init_enable_default+0x4e/0x60 block/blk-wbt.c:741, CPU#1: syz.4.451/8343
Modules linked in:
CPU: 1 UID: 0 PID: 8343 Comm: syz.4.451 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:wbt_init_enable_default+0x4e/0x60 block/blk-wbt.c:741
Code: 07 5b 5d e9 94 1f 22 fd e8 8f 1f 22 fd 48 89 ef e8 77 fa ff ff 31 ff 89 c3 89 c6 e8 1c 1a 22 fd 85 db 74 dd e8 73 1f 22 fd 90 <0f> 0b 90 eb d2 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90
RSP: 0018:ffffc90003f5f1b8 EFLAGS: 00010283
RAX: 0000000000053510 RBX: 00000000fffffff4 RCX: ffffc90018e07000
RDX: 0000000000080000 RSI: ffffffff849cb69d RDI: 0000000000000005
RBP: ffff8880263f6000 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff4 R11: ffff888026d80b30 R12: ffff888029bfdf50
R13: ffff8880263f6390 R14: ffff888029bfdf60 R15: ffff8880263f6090
FS:  00007f8969aab6c0(0000) GS:ffff8881249f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd417e7f000 CR3: 00000000807fa000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 blk_register_queue+0x39e/0x4e0 block/blk-sysfs.c:935
 __add_disk+0x74a/0xf00 block/genhd.c:528
 add_disk_fwnode+0x13f/0x5d0 block/genhd.c:597
 add_disk include/linux/blkdev.h:785 [inline]
 nbd_dev_add+0x783/0xbb0 drivers/block/nbd.c:1984
 nbd_genl_connect+0x8b0/0x1c60 drivers/block/nbd.c:2125
 genl_family_rcv_msg_doit+0x209/0x2f0 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646
 __sys_sendmsg+0x16d/0x220 net/socket.c:2678
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8968b8f749
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:00007f8969aab038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8968de6090 RCX: 00007f8968b8f749
RDX: 0000000000000004 RSI: 0000200000000240 RDI: 0000000000000005
RBP: 00007f8968c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8968de6128 R14: 00007f8968de6090 R15: 00007ffcc4c6db48
 </TASK>