unregister_netdevice: waiting for lo to become free. Usage count = 3331
ref_tracker: netdev@ffff88802ab08610 has 1/3330 users at
     dst_init+0xd9/0x450
     dst_alloc+0x12a/0x170
     ip_route_input_rcu+0x139f/0x30d0
     ip_route_input_noref+0x167/0x250
     ip_rcv_finish_core+0x5af/0x1c00
     ip_rcv_finish+0x14c/0x2f0
     NF_HOOK+0x30c/0x3a0
     __netif_receive_skb+0x143/0x380
     netif_receive_skb+0x1cb/0x790
     tun_rx_batched+0x1b9/0x730
     tun_get_user+0x2aa2/0x3e20
     tun_chr_write_iter+0x113/0x200
     vfs_write+0x5c9/0xb30
     ksys_write+0x145/0x250
     do_syscall_64+0xfa/0x3b0
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: netdev@ffff88802ab08610 has 3329/3330 users at
     dst_init+0xd9/0x450
     dst_alloc+0x12a/0x170
     ip_route_input_rcu+0x1ec2/0x30d0
     ip_route_input_noref+0x167/0x250
     ip_rcv_finish_core+0x5af/0x1c00
     ip_sublist_rcv+0x398/0xa10
     ip_list_rcv+0x3e2/0x430
     __netif_receive_skb_list_core+0x7d2/0x800
     netif_receive_skb_list_internal+0x96f/0xcb0
     netif_receive_skb_list+0x54/0x450
     bpf_test_run_xdp_live+0x1786/0x1b10
     bpf_prog_test_run_xdp+0x713/0x1000
     bpf_prog_test_run+0x2c7/0x340
     __sys_bpf+0x581/0x870
     __x64_sys_bpf+0x7c/0x90
     do_syscall_64+0xfa/0x3b0

