unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: netdev@ffff88807cc38620 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4403 [inline]
     netdev_hold include/linux/netdevice.h:4432 [inline]
     dst_init+0xda/0x5b0 net/core/dst.c:52
     dst_alloc+0xbb/0x1a0 net/core/dst.c:94
     rt_dst_alloc+0x35/0x3a0 net/ipv4/route.c:1651
     __mkroute_output net/ipv4/route.c:2655 [inline]
     ip_route_output_key_hash_rcu+0x87a/0x2870 net/ipv4/route.c:2875
     ip_route_output_key_hash+0x118/0x2b0 net/ipv4/route.c:2705
     __ip_route_output_key include/net/route.h:169 [inline]
     ip_route_output_flow+0x27/0x150 net/ipv4/route.c:2932
     ip_route_output_key include/net/route.h:179 [inline]
     sctp_v4_get_dst+0x3c4/0x1220 net/sctp/protocol.c:455
     sctp_transport_route+0x131/0x360 net/sctp/transport.c:448
     sctp_assoc_add_peer+0x765/0x14f0 net/sctp/associola.c:663
     sctp_connect_new_asoc+0x1f8/0x770 net/sctp/socket.c:1100
     sctp_sendmsg_new_asoc net/sctp/socket.c:1692 [inline]
     sctp_sendmsg+0x171a/0x22b0 net/sctp/socket.c:2003
     inet_sendmsg+0x11c/0x140 net/ipv4/af_inet.c:859
     sock_sendmsg_nosec net/socket.c:727 [inline]
     __sock_sendmsg net/socket.c:742 [inline]
     __sys_sendto+0x467/0x520 net/socket.c:2206
     __do_sys_sendto net/socket.c:2213 [inline]
     __se_sys_sendto net/socket.c:2209 [inline]
     __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2209
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f