unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: netdev@ffff88810b6a2618 has 1/1 users at
     dst_init+0xd9/0x480
     dst_alloc+0x12a/0x170
     ip_route_input_rcu+0x23e5/0x3130
     ip_route_input_noref+0x17c/0x270
     ip_rcv_finish_core+0x5af/0x1c00
     ip_rcv_finish+0x14c/0x2f0
     NF_HOOK+0x336/0x3c0
     __netif_receive_skb+0x143/0x370
     netif_receive_skb+0x1bb/0x790
     tun_rx_batched+0x1de/0x790
     tun_get_user+0x2a78/0x3dd0
     tun_chr_write_iter+0x113/0x200
     vfs_write+0x61d/0xb90
     ksys_write+0x150/0x270
     do_syscall_64+0xe2/0xf80
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

