unregister_netdevice: waiting for eth4 to become free. Usage count = 2
ref_tracker: netdev@ffff88817662c658 has 1/1 users at
     fib_create_info+0x2a72/0x3170
     fib_table_insert+0xcb/0x1b10
     fib_magic+0x43b/0x530
     fib_add_ifaddr+0x139/0x5d0
     fib_inetaddr_event+0x12e/0x190
     notifier_call_chain+0x1a5/0x3d0
     blocking_notifier_call_chain+0x6a/0x90
     __inet_insert_ifa+0x9ef/0xbc0
     inet_rtm_newaddr+0x102d/0x19e0
     rtnetlink_rcv_msg+0x802/0xc00
     netlink_rcv_skb+0x226/0x4a0
     netlink_unicast+0x7bb/0x940
     netlink_sendmsg+0x813/0xb40
     ____sys_sendmsg+0x9b9/0xa20
     ___sys_sendmsg+0x2a5/0x360
     __x64_sys_sendmsg+0x1bd/0x2a0

