unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: lo@ffff88805ac9a608 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4136 [inline]
     netdev_hold include/linux/netdevice.h:4165 [inline]
     dst_init+0xda/0x580 net/core/dst.c:52
     dst_alloc+0xbb/0x1a0 net/core/dst.c:93
     rt_dst_clone+0x5a/0x860 net/ipv4/route.c:1653
     ip_mc_finish_output+0xaf/0x680 net/ipv4/ip_output.c:356
     NF_HOOK include/linux/netfilter.h:314 [inline]
     NF_HOOK include/linux/netfilter.h:308 [inline]
     ip_mc_output+0x5e1/0x6a0 net/ipv4/ip_output.c:400
     dst_output include/net/dst.h:450 [inline]
     dst_output include/net/dst.h:448 [inline]
     ip_local_out net/ipv4/ip_output.c:130 [inline]
     ip_send_skb+0x329/0x560 net/ipv4/ip_output.c:1505
     udp_send_skb+0x6f1/0x1510 net/ipv4/udp.c:1142
     udp_sendmsg+0x18c5/0x29e0 net/ipv4/udp.c:1430
     inet_sendmsg+0x105/0x140 net/ipv4/af_inet.c:851
     sock_sendmsg_nosec net/socket.c:711 [inline]
     __sock_sendmsg net/socket.c:726 [inline]
     __sys_sendto+0x42a/0x4f0 net/socket.c:2197
     __do_sys_sendto net/socket.c:2204 [inline]
     __se_sys_sendto net/socket.c:2200 [inline]
     __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2200
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f