------------[ cut here ]------------
!rwb
WARNING: block/blk-wbt.c:784 at wbt_init_enable_default+0xcb/0x120 block/blk-wbt.c:784, CPU#1: syz.2.930/10435
Modules linked in:
CPU: 1 UID: 0 PID: 10435 Comm: syz.2.930 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:wbt_init_enable_default+0xcb/0x120 block/blk-wbt.c:784
Code: df e8 59 6c a3 06 4c 89 e7 e8 e1 38 00 00 48 89 df e8 a9 f5 a2 06 e8 94 2a 2a fd 5b 5d 41 5c e9 4b c2 a4 06 e8 86 2a 2a fd 90 <0f> 0b 90 eb 81 e8 7b 2a 2a fd 90 0f 0b 90 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc9000bcef1a0 EFLAGS: 00010287
RAX: 0000000000016b47 RBX: ffff88805caed000 RCX: ffffc9000c883000
RDX: 0000000000080000 RSI: ffffffff84dc47da RDI: ffffffff8c1ad620
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: ffffffff81000130 R12: ffff888028ea1310
R13: ffff88805caed390 R14: ffff888028ea1320 R15: ffff88805caed090
FS:  00007f013ef0d6c0(0000) GS:ffff888124492000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30fa1ff8 CR3: 00000000383e8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 blk_register_queue+0x39e/0x4e0 block/blk-sysfs.c:942
 __add_disk+0x73f/0xe40 block/genhd.c:528
 add_disk_fwnode+0x118/0x5c0 block/genhd.c:597
 add_disk include/linux/blkdev.h:785 [inline]
 nbd_dev_add+0x77a/0xb10 drivers/block/nbd.c:1984
 nbd_genl_connect+0xb8d/0x1a40 drivers/block/nbd.c:2125
 genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x159/0x420 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+0x8b0/0xda0 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xa54/0xc30 net/socket.c:2592
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2646
 __sys_sendmsg+0x170/0x220 net/socket.c:2678
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f013df9bf79
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:00007f013ef0d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f013e215fa0 RCX: 00007f013df9bf79
RDX: 0000000020040000 RSI: 0000200000000500 RDI: 0000000000000005
RBP: 00007f013e0327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f013e216038 R14: 00007f013e215fa0 R15: 00007ffd8b29db88
 </TASK>