unregister_netdevice: waiting for lo to become free. Usage count = 202
ref_tracker: netdev@ffff88810ac22610 has 191/201 users at
     dst_init+0xd9/0x450
     dst_alloc+0x12a/0x170
     rt_dst_clone+0x52/0x680
     ip_mc_finish_output+0xec/0x250
     ip_mc_output+0x3a3/0x590
     iptunnel_xmit+0x592/0xa40
     udp_tunnel_xmit_skb+0x26e/0x3c0
     tipc_udp_xmit+0x7bd/0xaa0
     tipc_udp_send_msg+0x27f/0x3f0
     tipc_bearer_xmit_skb+0x2b3/0x400
     tipc_disc_timeout+0x580/0x6d0
     call_timer_fn+0x17e/0x5f0
     __run_timer_base+0x61a/0x860
     run_timer_softirq+0xb7/0x180
     handle_softirqs+0x286/0x870
     __irq_exit_rcu+0xca/0x1f0

ref_tracker: netdev@ffff88810ac22610 has 1/201 users at
     dst_init+0xd9/0x450
     dst_alloc+0x12a/0x170
     rt_dst_clone+0x52/0x680
     ip_mc_finish_output+0xec/0x250
     ip_mc_output+0x3a3/0x590
     iptunnel_xmit+0x592/0xa40
     udp_tunnel_xmit_skb+0x26e/0x3c0
     tipc_udp_xmit+0x7bd/0xaa0
     tipc_udp_send_msg+0x27f/0x3f0
     tipc_bearer_xmit_skb+0x2b3/0x400
     tipc_disc_timeout+0x580/0x6d0
     call_timer_fn+0x17e/0x5f0
     __run_timer_base+0x61a/0x860
     run_timer_softirq+0xb7/0x180
     handle_softirqs+0x286/0x870
     run_ksoftirqd+0x9b/0x100

ref_tracker: netdev@ffff88810ac22610 has 7/201 users at
     dst_init+0xd9/0x450
     dst_alloc+0x12a/0x170
     rt_dst_clone+0x52/0x680
     ip_mc_finish_output+0xec/0x250
     ip_mc_output+0x3a3/0x590
     iptunnel_xmit+0x592/0xa40
     udp_tunnel_xmit_skb+0x26e/0x3c0
     tipc_udp_xmit+0x7bd/0xaa0
     tipc_udp_send_msg+0x27f/0x3f0
     tipc_bearer_xmit_skb+0x2b3/0x400
     tipc_disc_timeout+0x580/0x6d0
     call_timer_fn+0x17e/0x5f0
     __run_timer_base+0x61a/0x860
     run_timer_softirq+0xb7/0x180
     handle_softirqs+0x286/0x870
     do_softirq+0xec/0x180

ref_tracker: netdev@ffff88810ac22610 has 1/201 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_queue_xmit+0x1106/0x1b00
     l2tp_xmit_skb+0x100f/0x17b0
     pppol2tp_sendmsg+0x40a/0x5f0
     __sock_sendmsg+0x21c/0x270
     sock_write_iter+0x258/0x330
     vfs_write+0x54b/0xa90
     ksys_write+0x145/0x250
     do_syscall_64+0xfa/0x3b0
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: netdev@ffff88810ac22610 has 1/201 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+0x195a/0x2170
     udpv6_sendmsg+0xbf0/0x24b0
     __sock_sendmsg+0xe5/0x270
     ____sys_sendmsg+0x52d/0x830
     ___sys_sendmsg+0x21f/0x2a0
     __sys_sendmmsg+0x227/0x430
     __x64_sys_sendmmsg+0xa0/0xc0
     do_syscall_64+0xfa/0x3b0
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

