unregister_netdevice: waiting for lo to become free. Usage count = 3
ref_tracker: netdev@ffff88807cd6a620 has 2/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4403 [inline]
     netdev_hold include/linux/netdevice.h:4432 [inline]
     dst_init+0xd9/0x480 net/core/dst.c:52
     dst_alloc+0x12a/0x170 net/core/dst.c:94
     rt_dst_alloc net/ipv4/route.c:1651 [inline]
     __mkroute_output net/ipv4/route.c:2655 [inline]
     ip_route_output_key_hash_rcu+0x14d0/0x25d0 net/ipv4/route.c:2875
     ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2705
     __ip_route_output_key include/net/route.h:169 [inline]
     ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2932
     ip_route_output_key include/net/route.h:179 [inline]
     sctp_v4_get_dst+0x3f8/0x12b0 net/sctp/protocol.c:455
     sctp_transport_route+0x118/0x2f0 net/sctp/transport.c:448
     sctp_assoc_add_peer+0x650/0x13b0 net/sctp/associola.c:663
     sctp_connect_new_asoc+0x329/0x6b0 net/sctp/socket.c:1100
     __sctp_connect+0x5cb/0xdc0 net/sctp/socket.c:1198
     sctp_getsockopt_connectx3+0x227/0x360 net/sctp/socket.c:1422
     sctp_getsockopt+0x984/0xb90 net/sctp/socket.c:8174
     do_sock_getsockopt+0x2d3/0x3f0 net/socket.c:2383
     __sys_getsockopt net/socket.c:2412 [inline]
     __do_sys_getsockopt net/socket.c:2419 [inline]
     __se_sys_getsockopt net/socket.c:2416 [inline]
     __x64_sys_getsockopt+0x1a4/0x240 net/socket.c:2416
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f