unregister_netdevice: waiting for lo to become free. Usage count = 1025
ref_tracker: lo@ffff88805dc64610 has 1024/1024 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4331 [inline]
     netdev_hold include/linux/netdevice.h:4360 [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:1666
     ip_mc_finish_output+0xb0/0x680 net/ipv4/ip_output.c:355
     NF_HOOK include/linux/netfilter.h:314 [inline]
     NF_HOOK include/linux/netfilter.h:308 [inline]
     ip_mc_output+0x5d5/0x6a0 net/ipv4/ip_output.c:399
     dst_output include/net/dst.h:459 [inline]
     dst_output include/net/dst.h:457 [inline]
     ip_local_out net/ipv4/ip_output.c:129 [inline]
     ip_send_skb+0x32c/0x560 net/ipv4/ip_output.c:1501
     udp_send_skb+0x71d/0x15b0 net/ipv4/udp.c:1195
     udp_sendmsg+0x18d6/0x29e0 net/ipv4/udp.c:1483
     inet_sendmsg+0x105/0x140 net/ipv4/af_inet.c:851
     sock_sendmsg_nosec net/socket.c:712 [inline]
     __sock_sendmsg net/socket.c:727 [inline]
     ____sys_sendmsg+0x973/0xc70 net/socket.c:2566
     ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
     __sys_sendmmsg+0x200/0x420 net/socket.c:2709
     __do_sys_sendmmsg net/socket.c:2736 [inline]
     __se_sys_sendmmsg net/socket.c:2733 [inline]
     __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2733
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f