unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: netdev@ffff8881b57ce700 has 1/1 users at
     dst_init+0xbe/0x470
     dst_alloc+0x12a/0x170
     ip_route_input_rcu+0x146e/0x3190
     ip_route_input_noref+0x17c/0x270
     ip_rcv_finish_core+0x593/0x1c00
     ip_rcv_finish+0x14c/0x2a0
     ip_sabotage_in+0x1e1/0x270
     nf_hook_slow+0xc5/0x220
     NF_HOOK+0x21f/0x3c0
     netif_receive_skb+0x45b/0xbf0
     NF_HOOK+0xa4/0x3a0
     br_handle_frame_finish+0x1192/0x1990
     br_nf_pre_routing_finish+0x138a/0x1a10
     NF_HOOK+0x64e/0x6e0
     br_nf_pre_routing+0xec2/0x14b0
     br_handle_frame+0x127f/0x1510

