netlink: 16 bytes leftover after parsing attributes in process `syz.4.54'.
netlink: 20 bytes leftover after parsing attributes in process `syz.4.54'.
"mq-deadline" elevator initialization, failed -12, falling back to "none"
------------[ cut here ]------------
WARNING: block/blk-wbt.c:741 at wbt_init_enable_default+0x4e/0x60 block/blk-wbt.c:741, CPU#1: syz.4.54/6220
Modules linked in:
CPU: 1 UID: 0 PID: 6220 Comm: syz.4.54 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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: ff 89 c6 e8 d4 96 3e fd 85 db 75 18 e8 8b 92 3e fd 5b c3 cc cc cc cc cc e8 7f 92 3e fd 5b e9 99 7a df 06 cc e8 73 92 3e fd 90 <0f> 0b 90 5b e9 89 7a df 06 cc 0f 1f 84 00 00 00 00 00 90 90 90 90
RSP: 0018:ffffc9000b7beeb8 EFLAGS: 00010283
RAX: ffffffff8482858d RBX: 00000000fffffff4 RCX: 0000000000080000
RDX: ffffc9000f25b000 RSI: 000000000000e35c RDI: 000000000000e35d
RBP: 1ffff11005f51e12 R08: ffffffff8fa2d8f7 R09: 1ffffffff1f45b1e
R10: dffffc0000000000 R11: fffffbfff1f45b1f R12: 0000000000000000
R13: 1ffff1100501fbec R14: ffff88802fa8f000 R15: ffff8880280fdf50
FS:  00007ff4c7ff66c0(0000) GS:ffff888125cf7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30cf5ff8 CR3: 00000000799d4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 blk_register_queue+0x36a/0x3f0 block/blk-sysfs.c:935
 __add_disk+0x677/0xd50 block/genhd.c:528
 add_disk_fwnode+0xfc/0x480 block/genhd.c:597
 add_disk include/linux/blkdev.h:785 [inline]
 nbd_dev_add+0x717/0xae0 drivers/block/nbd.c:1984
 nbd_genl_connect+0x919/0x1900 drivers/block/nbd.c:2125
 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 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+0x82f/0x9e0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:737
 __sock_sendmsg net/socket.c:752 [inline]
 ____sys_sendmsg+0x577/0x880 net/socket.c:2610
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2664
 __sys_sendmsg net/socket.c:2696 [inline]
 __do_sys_sendmsg net/socket.c:2701 [inline]
 __se_sys_sendmsg net/socket.c:2699 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2699
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff4c9d8f749
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:00007ff4c7ff6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff4c9fe6090 RCX: 00007ff4c9d8f749
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000004
RBP: 00007ff4c9e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff4c9fe6128 R14: 00007ff4c9fe6090 R15: 00007fff89206e48
 </TASK>