unregister_netdevice: waiting for lo to become free. Usage count = 5
ref_tracker: netdev@ffff88807d0c2618 has 2/4 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]
     netdev_hold include/linux/netdevice.h:4429 [inline]
     dst_init+0xd9/0x450 net/core/dst.c:52
     dst_alloc+0x12a/0x170 net/core/dst.c:93
     ip6_dst_alloc net/ipv6/route.c:342 [inline]
     ip6_rt_pcpu_alloc net/ipv6/route.c:1418 [inline]
     rt6_make_pcpu_route net/ipv6/route.c:1467 [inline]
     ip6_pol_route+0xa21/0x1180 net/ipv6/route.c:2305
     pol_lookup_func include/net/ip6_fib.h:617 [inline]
     fib6_rule_lookup+0x348/0x6f0 net/ipv6/fib6_rules.c:125
     ip6_route_output_flags_noref net/ipv6/route.c:2684 [inline]
     ip6_route_output_flags+0x364/0x5d0 net/ipv6/route.c:2696
     ip6_route_output include/net/ip6_route.h:93 [inline]
     ip6_dst_lookup_tail+0x1ae/0x1510 net/ipv6/ip6_output.c:1141
     ip6_dst_lookup_flow+0x47/0xe0 net/ipv6/ip6_output.c:1272
     sctp_v6_get_dst+0x6c7/0x1c90 net/sctp/ipv6.c:327
     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+0x30a/0x690 net/sctp/socket.c:1100
     __sctp_connect+0x5b5/0xda0 net/sctp/socket.c:1198
     sctp_getsockopt_connectx3+0x1fa/0x320 net/sctp/socket.c:1422
     sctp_getsockopt+0x984/0xb90 net/sctp/socket.c:8174
     do_sock_getsockopt+0x2b4/0x3d0 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+0x1a5/0x250 net/socket.c:2416

ref_tracker: netdev@ffff88807d0c2618 has 1/4 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4412 [inline]
     netdev_get_by_index+0x79/0xb0 net/core/dev.c:1008
     fib6_nh_init+0x1cd/0x1ff0 net/ipv6/route.c:3590
     nh_create_ipv6 net/ipv4/nexthop.c:2875 [inline]
     nexthop_create net/ipv4/nexthop.c:2926 [inline]
     nexthop_add net/ipv4/nexthop.c:2963 [inline]
     rtm_new_nexthop+0x38d6/0x8130 net/ipv4/nexthop.c:3277
     rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
     netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
     netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
     netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
     sock_sendmsg_nosec net/socket.c:727 [inline]
     __sock_sendmsg+0x21c/0x270 net/socket.c:742
     ____sys_sendmsg+0x52d/0x820 net/socket.c:2592
     ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646
     __sys_sendmmsg+0x227/0x430 net/socket.c:2735
     __do_sys_sendmmsg net/socket.c:2762 [inline]
     __se_sys_sendmmsg net/socket.c:2759 [inline]
     __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2759
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: netdev@ffff88807d0c2618 has 1/4 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]
     netdev_hold include/linux/netdevice.h:4429 [inline]
     ipv6_add_dev+0x50f/0x13a0 net/ipv6/addrconf.c:411
     addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3650
     notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
     call_netdevice_notifiers net/core/dev.c:2282 [inline]
     register_netdevice+0x15bd/0x1a70 net/core/dev.c:11429
     register_netdev+0x40/0x60 net/core/dev.c:11507
     loopback_net_init+0x75/0x150 drivers/net/loopback.c:218
     ops_init+0x35c/0x5c0 net/core/net_namespace.c:137
     setup_net+0x110/0x330 net/core/net_namespace.c:446
     copy_net_ns+0x3e3/0x570 net/core/net_namespace.c:581
     create_new_namespaces+0x3e7/0x6a0 kernel/nsproxy.c:130
     unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:226
     ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3171
     __do_sys_unshare kernel/fork.c:3242 [inline]
     __se_sys_unshare kernel/fork.c:3240 [inline]
     __x64_sys_unshare+0x38/0x50 kernel/fork.c:3240
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f