unregister_netdevice: waiting for netdevsim2 to become free. Usage count = 2
ref_tracker: eth%d@0000000072e9fb51 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4059 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:914
     fib6_nh_init+0x1ac/0x1c58 net/ipv6/route.c:3543
     ip6_route_info_create+0x790/0xefc net/ipv6/route.c:3809
     addrconf_f6i_alloc+0x2c4/0x5d0 net/ipv6/route.c:4588
     ipv6_add_addr+0x4b4/0xde8 net/ipv6/addrconf.c:1120
     addrconf_add_linklocal+0x2c4/0x8b4 net/ipv6/addrconf.c:3315
     addrconf_addr_gen+0x3d4/0x8f4 net/ipv6/addrconf.c:3446
     addrconf_init_auto_addrs+0x798/0xca0
     addrconf_notify+0x8d0/0xce8 net/ipv6/addrconf.c:3743
     notifier_call_chain+0x1b4/0x538 kernel/notifier.c:93
     raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:461
     __dev_notify_flags+0x2c4/0x550
     dev_change_flags+0xd0/0x15c net/core/dev.c:8915
     do_setlink+0xadc/0x3778 net/core/rtnetlink.c:2900
     __rtnl_newlink net/core/rtnetlink.c:3696 [inline]
     rtnl_newlink+0x14c4/0x1bd0 net/core/rtnetlink.c:3743
     rtnetlink_rcv_msg+0x630/0xa9c net/core/rtnetlink.c:6647

netdevsim netdevsim3 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim3 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0