unregister_netdevice: waiting for lo to become free. Usage count = 5
ref_tracker: netdev@ffff8881b6d44618 has 1/4 users at
     dst_init+0xd9/0x450
     dst_alloc+0x12a/0x170
     ip6_pol_route+0xa3e/0x11a0
     fib6_rule_action+0x206/0x7d0
     fib_rules_lookup+0x768/0xea0
     fib6_rule_lookup+0x1a0/0x730
     ip6_route_output_flags+0x364/0x5d0
     ip6_dst_lookup_tail+0x1c3/0x15a0
     ip6_dst_lookup_flow+0x47/0xe0
     sctp_v6_get_dst+0x6fb/0x1ce0
     sctp_transport_route+0x118/0x2f0
     sctp_assoc_add_peer+0x650/0x13b0
     sctp_connect_new_asoc+0x329/0x6b0
     __sctp_connect+0x5cb/0xdc0
     sctp_getsockopt_connectx3+0x227/0x360
     sctp_getsockopt+0x984/0xb90

ref_tracker: netdev@ffff8881b6d44618 has 1/4 users at
     dst_init+0xd9/0x450
     dst_alloc+0x12a/0x170
     ip6_pol_route+0xa3e/0x11a0
     fib6_rule_action+0x206/0x7d0
     fib_rules_lookup+0x768/0xea0
     fib6_rule_lookup+0x1a0/0x730
     ip6_route_output_flags+0x364/0x5d0
     ip6_dst_lookup_tail+0x1c3/0x15a0
     ip6_dst_lookup_flow+0x47/0xe0
     sctp_v6_get_dst+0x6fb/0x1ce0
     sctp_transport_route+0x118/0x2f0
     sctp_assoc_add_peer+0x650/0x13b0
     sctp_connect_new_asoc+0x329/0x6b0
     __sctp_connect+0x5cb/0xdc0
     sctp_inet_connect+0x12e/0x210
     __sys_connect+0x312/0x450

ref_tracker: netdev@ffff8881b6d44618 has 1/4 users at
     netdev_get_by_index+0x79/0xb0
     fib6_nh_init+0x1f7/0x2060
     rtm_new_nexthop+0x3b24/0x8620
     rtnetlink_rcv_msg+0x7d5/0xbe0
     netlink_rcv_skb+0x232/0x4b0
     netlink_unicast+0x80f/0x9b0
     netlink_sendmsg+0x813/0xb40
     __sock_sendmsg+0x21c/0x270
     ____sys_sendmsg+0x4d7/0x810
     ___sys_sendmsg+0x2a5/0x360
     __x64_sys_sendmsg+0x1bd/0x2a0
     do_syscall_64+0xf0/0xf80
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: netdev@ffff8881b6d44618 has 1/4 users at
     ipv6_add_dev+0x50f/0x13a0
     addrconf_notify+0x771/0x1050
     notifier_call_chain+0x19d/0x3a0
     register_netdevice+0x15e8/0x1a90
     register_netdev+0x40/0x60
     loopback_net_init+0x75/0x150
     ops_init+0x35c/0x5c0
     setup_net+0x118/0x340
     copy_net_ns+0x3e2/0x570
     create_new_namespaces+0x3e7/0x6a0
     unshare_nsproxy_namespaces+0x11a/0x160
     ksys_unshare+0x4f4/0x900
     __x64_sys_unshare+0x38/0x50
     do_syscall_64+0xf0/0xf80
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

