unregister_netdevice: waiting for lo to become free. Usage count = 3
ref_tracker: lo@ffff88805f1ca5b8 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_ootb_pkt_new+0x28b/0x3c0 net/sctp/sm_statefuns.c:6436
     sctp_sf_tabort_8_4_8+0x30/0x3e0 net/sctp/sm_statefuns.c:3492
     sctp_sf_do_5_1B_init+0x48e/0xe30 net/sctp/sm_statefuns.c:-1
     sctp_do_sm+0x23a/0x5a60 net/sctp/sm_sideeffect.c:1166
     sctp_endpoint_bh_rcv+0x59b/0x7e0 net/sctp/endpointola.c:407
     sctp_rcv+0x10dd/0x1770 net/sctp/input.c:243
     ip_protocol_deliver_rcu+0x20e/0x3f0 net/ipv4/ip_input.c:205
     ip_local_deliver_finish+0x2ca/0x510 net/ipv4/ip_input.c:233
     NF_HOOK+0x32d/0x3b0 include/linux/netfilter.h:304

ref_tracker: lo@ffff88805f1ca5b8 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_setsockopt_connectx net/sctp/socket.c:1336 [inline]
     sctp_getsockopt_connectx3+0x2f5/0x480 net/sctp/socket.c:1421
     sctp_getsockopt+0x986/0xb60 net/sctp/socket.c:8129
     do_sock_getsockopt+0x379/0x450 net/socket.c:2383
     __sys_getsockopt net/socket.c:2412 [inline]
     __do_sys_getsockopt net/socket.c:2422 [inline]
     __se_sys_getsockopt net/socket.c:2419 [inline]
     __x64_sys_getsockopt+0x1d6/0x280 net/socket.c:2419
     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