unregister_netdevice: waiting for eth4 to become free. Usage count = 2
ref_tracker: netdev@ffff888173dbc658 has 1/1 users at
     fib_create_info+0x22e0/0x31f0
     fib_table_insert+0xc8/0x1b50
     fib_magic+0x434/0x510
     fib_add_ifaddr+0x144/0x5f0
     fib_inetaddr_event+0x12e/0x190
     notifier_call_chain+0x1ad/0x3d0
     blocking_notifier_call_chain+0x6a/0x90
     __inet_insert_ifa+0x9e9/0xbc0
     inet_rtm_newaddr+0x10d8/0x1ad0
     rtnetlink_rcv_msg+0x7d5/0xbe0
     netlink_rcv_skb+0x232/0x4b0
     netlink_unicast+0x75c/0x8e0
     netlink_sendmsg+0x813/0xb40
     ____sys_sendmsg+0x972/0x9f0
     ___sys_sendmsg+0x2a5/0x360
     __x64_sys_sendmsg+0x1bd/0x2a0

