unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: lo@ffff88802a8a2610 has 1/1 users at
     dst_init+0xd9/0x450
     dst_alloc+0x12a/0x170
     rt_dst_clone+0x52/0x680
     ip_mc_finish_output+0x10a/0x5f0
     ip_mc_output+0x25c/0x590
     ip_send_skb+0x74/0x100
     udp_send_skb+0xaf1/0x14c0
     udp_sendmsg+0x195b/0x2300
     __sock_sendmsg+0x19c/0x270
     sock_sendmsg+0x158/0x230
     splice_to_socket+0x8ff/0xf10
     do_splice+0xc79/0x1660
     __se_sys_splice+0x2e1/0x460
     do_syscall_64+0xfa/0x3b0
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

