unregister_netdevice: waiting for lo to become free. Usage count = 3
ref_tracker: lo@ffff88807aef25b8 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4110 [inline]
     netdev_hold include/linux/netdevice.h:4139 [inline]
     dst_init+0xd9/0x460 net/core/dst.c:52
     dst_alloc+0x12e/0x170 net/core/dst.c:93
     rt_dst_alloc net/ipv4/route.c:1662 [inline]
     __mkroute_output net/ipv4/route.c:2626 [inline]
     ip_route_output_key_hash_rcu+0x14f0/0x2360 net/ipv4/route.c:2848
     ip_route_output_key_hash+0x1f3/0x330 net/ipv4/route.c:2677
     __ip_route_output_key include/net/route.h:134 [inline]
     ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2905
     ip_route_output_key include/net/route.h:150 [inline]
     sctp_v4_get_dst+0x400/0x1230 net/sctp/protocol.c:452
     sctp_transport_route+0x10b/0x2c0 net/sctp/transport.c:457
     sctp_assoc_add_peer+0x650/0x1390 net/sctp/associola.c:663
     sctp_connect_new_asoc+0x323/0x6a0 net/sctp/socket.c:1099
     __sctp_connect+0x5b7/0xd80 net/sctp/socket.c:1197
     sctp_connect net/sctp/socket.c:4817 [inline]
     sctp_inet_connect+0x12e/0x1e0 net/sctp/socket.c:4832
     __sys_connect_file net/socket.c:2056 [inline]
     __sys_connect+0x3da/0x470 net/socket.c:2073
     __do_sys_connect net/socket.c:2083 [inline]
     __se_sys_connect net/socket.c:2080 [inline]
     __x64_sys_connect+0x7a/0x90 net/socket.c:2080
     do_syscall_x64 arch/x86/entry/common.c:46 [inline]
     do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
     entry_SYSCALL_64_after_hwframe+0x68/0xd2

ref_tracker: lo@ffff88807aef25b8 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4110 [inline]
     netdev_hold include/linux/netdevice.h:4139 [inline]
     dst_init+0xd9/0x460 net/core/dst.c:52
     dst_alloc+0x12e/0x170 net/core/dst.c:93
     rt_dst_alloc net/ipv4/route.c:1662 [inline]
     __mkroute_output net/ipv4/route.c:2626 [inline]
     ip_route_output_key_hash_rcu+0x14f0/0x2360 net/ipv4/route.c:2848
     ip_route_output_key_hash+0x1f3/0x330 net/ipv4/route.c:2677
     __ip_route_output_key include/net/route.h:134 [inline]
     ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2905
     ip_route_output_key include/net/route.h:150 [inline]
     sctp_v4_get_dst+0x400/0x1230 net/sctp/protocol.c:452
     sctp_transport_route+0x10b/0x2c0 net/sctp/transport.c:457
     sctp_assoc_add_peer+0x650/0x1390 net/sctp/associola.c:663
     sctp_connect_new_asoc+0x323/0x6a0 net/sctp/socket.c:1099
     sctp_sendmsg_new_asoc net/sctp/socket.c:1691 [inline]
     sctp_sendmsg+0x1575/0x28c0 net/sctp/socket.c:2002
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg net/socket.c:745 [inline]
     __sys_sendto+0x4a9/0x6b0 net/socket.c:2200
     __do_sys_sendto net/socket.c:2212 [inline]
     __se_sys_sendto net/socket.c:2208 [inline]
     __x64_sys_sendto+0xde/0xf0 net/socket.c:2208
     do_syscall_x64 arch/x86/entry/common.c:46 [inline]
     do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
     entry_SYSCALL_64_after_hwframe+0x68/0xd2