unregister_netdevice: waiting for vcan0 to become free. Usage count = 2
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4043 [inline]
 netdev_tracker_alloc+0x68/0xb4 include/linux/netdevice.h:4055
 fib_create_info+0x126c/0x1e60 net/ipv4/fib_semantics.c:1552
 fib_table_insert+0x1a4/0x1574 net/ipv4/fib_trie.c:1236
 fib_magic net/ipv4/fib_frontend.c:1104 [inline]
 fib_add_ifaddr+0x368/0x122c net/ipv4/fib_frontend.c:1126
 fib_inetaddr_event+0x124/0x2fc net/ipv4/fib_frontend.c:1440
 notifier_call_chain kernel/notifier.c:87 [inline]
 blocking_notifier_call_chain+0xf0/0x198 kernel/notifier.c:382
 __inet_insert_ifa+0x8ac/0xa8c net/ipv4/devinet.c:569
 inet_rtm_newaddr+0xe74/0x1744 net/ipv4/devinet.c:971
 rtnetlink_rcv_msg+0x72c/0xd94 net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2493
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6168
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1859
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 __sys_sendto+0x3b8/0x508 net/socket.c:2153
 __do_sys_sendto net/socket.c:2165 [inline]
 __se_sys_sendto net/socket.c:2161 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2161
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52