unregister_netdevice: waiting for lo to become free. Usage count = 2
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4051 [inline]
 netdev_hold include/linux/netdevice.h:4080 [inline]
 dst_init+0xc8/0x3c4 net/core/dst.c:52
 dst_alloc+0x120/0x170 net/core/dst.c:92
 rt_dst_clone+0x68/0x638 net/ipv4/route.c:1686
 ip_mc_finish_output+0x10c/0x4a0 net/ipv4/ip_output.c:348
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ip_mc_output+0x384/0x6ec net/ipv4/ip_output.c:394
 dst_output include/net/dst.h:453 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 ip_send_skb+0x134/0x2b0 net/ipv4/ip_output.c:1600
 ip_push_pending_frames+0x6c/0x88 net/ipv4/ip_output.c:1620
 raw_sendmsg+0xfb4/0x14c0 net/ipv4/raw.c:653
 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:841
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5b8/0x918 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x25c/0x320 net/socket.c:2602
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg net/socket.c:2609 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637