unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: lo@ffff88804c412620 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_hold include/linux/netdevice.h:4091 [inline]
     dst_init+0xee/0x490 net/core/dst.c:52
     dst_alloc+0x14f/0x190 net/core/dst.c:93
     rt_dst_clone+0x52/0x650 net/ipv4/route.c:1640
     ip_mc_finish_output+0x102/0x570 net/ipv4/ip_output.c:356
     NF_HOOK include/linux/netfilter.h:314 [inline]
     ip_mc_output+0x279/0x5c0 net/ipv4/ip_output.c:400
     ip_local_out net/ipv4/ip_output.c:130 [inline]
     ip_send_skb net/ipv4/ip_output.c:1496 [inline]
     ip_push_pending_frames+0xbf/0x150 net/ipv4/ip_output.c:1516
     raw_sendmsg+0x1ac5/0x2490 net/ipv4/raw.c:657
     sock_sendmsg_nosec net/socket.c:729 [inline]
     __sock_sendmsg+0x1a6/0x270 net/socket.c:744
     ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2607
     ___sys_sendmsg net/socket.c:2661 [inline]
     __sys_sendmsg+0x292/0x380 net/socket.c:2690
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f