netlink: 20 bytes leftover after parsing attributes in process `syz.6.636'. ------------[ cut here ]------------ WARNING: block/blk-wbt.c:741 at wbt_init_enable_default+0x4e/0x60 block/blk-wbt.c:741, CPU#1: syz.6.636/9440 Modules linked in: CPU: 1 UID: 0 PID: 9440 Comm: syz.6.636 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: ff 89 c6 e8 f4 e4 40 fd 85 db 75 18 e8 ab e0 40 fd 5b e9 40 2b 90 fc cc e8 9f e0 40 fd 5b e9 34 2b 90 fc cc e8 93 e0 40 fd 90 <0f> 0b 90 5b e9 24 2b 90 fc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 RSP: 0018:ffffc90003d1eed8 EFLAGS: 00010287 RAX: ffffffff848015dd RBX: 00000000fffffff4 RCX: 0000000000080000 RDX: ffffc9000d91b000 RSI: 000000000000f6e1 RDI: 000000000000f6e2 RBP: 1ffff11005141a12 R08: ffffffff8f822077 R09: 1ffffffff1f0440e R10: dffffc0000000000 R11: fffffbfff1f0440f R12: 0000000000000000 R13: 1ffff11005146859 R14: ffff888028a0d000 R15: ffff888028a342b8 FS: 00007fc7400d96c0(0000) GS:ffff888125f21000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fabd64d9a90 CR3: 0000000029c12000 CR4: 0000000000350ef0 Call Trace: 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 net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x820 net/socket.c:2592 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681 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: 0033:0x7fc73f18f749 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:00007fc7400d9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc73f3e6090 RCX: 00007fc73f18f749 RDX: 0000000000000004 RSI: 0000200000000240 RDI: 0000000000000006 RBP: 00007fc73f213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc73f3e6128 R14: 00007fc73f3e6090 R15: 00007ffc16b23548