unregister_netdevice: waiting for lo to become free. Usage count = 5
ref_tracker: netdev@ffff888175e5a700 has 4/4 users at
     dst_init+0xbe/0x470
     dst_alloc+0x12a/0x170
     ip_route_input_rcu+0x20ca/0x3190
     ip_route_input_noref+0x17c/0x270
     ip_rcv_finish_core+0x593/0x1c00
     ip_rcv_finish+0x14c/0x2a0
     NF_HOOK+0x336/0x3c0
     netif_receive_skb+0x45b/0xbf0
     tun_rx_batched+0x1de/0x790
     tun_get_user+0x2b44/0x4370
     tun_chr_write_iter+0x113/0x200
     vfs_write+0x612/0xba0
     ksys_write+0x150/0x270
     do_syscall_64+0x174/0x580
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

