unregister_netdevice: waiting for lo to become free. Usage count = 6660
ref_tracker: netdev@ffff88816afe6700 has 1/6659 users at
     dst_init+0xbe/0x470
     dst_alloc+0x12a/0x170
     rt_dst_clone+0x52/0x680
     ip_mc_finish_output+0xea/0x2e0
     ip_mc_output+0x254/0x580
     ip_send_skb+0x45/0xc0
     udp_send_skb+0x7f7/0xfb0
     udp_sendmsg+0x1971/0x2140
     udpv6_sendmsg+0x915/0x2610
     sock_sendmsg_nosec+0x90/0x180
     sock_write_iter+0x2de/0x3e0
     vfs_write+0x612/0xba0
     ksys_write+0x150/0x270
     do_syscall_64+0x174/0x580
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: netdev@ffff88816afe6700 has 6658/6659 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_sublist_rcv+0x3ab/0xa70
     ip_list_rcv+0x3ec/0x440
     __netif_receive_skb_list_core+0x804/0x830
     netif_receive_skb_list_internal+0x995/0xcf0
     netif_receive_skb_list+0x67/0x480
     bpf_test_run_xdp_live+0x1875/0x1c20
     bpf_prog_test_run_xdp+0x7d8/0x11d0
     bpf_prog_test_run+0x2c5/0x340
     __sys_bpf+0xa22/0xd90
     __x64_sys_bpf+0xba/0xd0
     do_syscall_64+0x174/0x580

