------------[ cut here ]------------
WARNING: block/blk-wbt.c:741 at wbt_init_enable_default+0x4e/0x60 block/blk-wbt.c:741, CPU#1: syz.1.6/5951
Modules linked in:
CPU: 1 UID: 0 PID: 5951 Comm: syz.1.6 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 14 c9 20 fd e8 0f c9 20 fd 48 89 ef e8 77 fa ff ff 31 ff 89 c3 89 c6 e8 9c c3 20 fd 85 db 74 dd e8 f3 c8 20 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:ffffc9000457f1b8 EFLAGS: 00010287
RAX: 000000000001c9ff RBX: 00000000fffffff4 RCX: ffffc9000d759000
RDX: 0000000000080000 RSI: ffffffff849e1d7d RDI: 0000000000000005
RBP: ffff88807b9e8000 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffff4 R11: ffffffff8228beeb R12: ffff888029ae55c8
R13: ffff88807b9e8390 R14: ffff888029ae55d8 R15: ffff88807b9e8090
FS:  00007f05766546c0(0000) GS:ffff8881249f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fed27fb5000 CR3: 0000000076517000 CR4: 00000000003526f0
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: 0033:0x7f057578f749
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:00007f0576654038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f05759e6090 RCX: 00007f057578f749
RDX: 0000000000000004 RSI: 0000200000000240 RDI: 0000000000000007
RBP: 00007f0575813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f05759e6128 R14: 00007f05759e6090 R15: 00007ffcf163a058
 </TASK>