unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: netdev@ffff888122856610 has 1/1 users at
     dst_init+0xd9/0x450
     dst_alloc+0x12a/0x170
     rt_dst_clone+0x52/0x680
     ip_mc_finish_output+0xec/0x250
     ip_mc_output+0x25c/0x590
     ip_send_skb+0x74/0x100
     udp_send_skb+0xaf1/0x14c0
     udp_sendmsg+0x6db/0x2170
     __sock_sendmsg+0x19c/0x270
     __sys_sendto+0x3bd/0x520
     __x64_sys_sendto+0xde/0x100
     do_syscall_64+0xfa/0x3b0
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

