unregister_netdevice: waiting for lo to become free. Usage count = 3
ref_tracker: netdev@ffff888125544610 has 1/2 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_push_pending_frames+0xbe/0x150
     raw_sendmsg+0x1440/0x18b0
     __sock_sendmsg+0x19c/0x270
     ____sys_sendmsg+0x505/0x830
     ___sys_sendmsg+0x21f/0x2a0
     __x64_sys_sendmsg+0x19b/0x260
     do_syscall_64+0xfa/0x3b0
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: netdev@ffff888125544610 has 1/2 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+0x505/0x830
     ___sys_sendmsg+0x21f/0x2a0
     __x64_sys_sendmsg+0x19b/0x260
     do_syscall_64+0xfa/0x3b0
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

