unregister_netdevice: waiting for dvmrp1 to become free. Usage count = 2
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4070 [inline]
 netdev_tracker_alloc include/linux/netdevice.h:4082 [inline]
 fib6_nh_init+0x664/0x1c84 net/ipv6/route.c:3613
 ip6_route_info_create+0x7ac/0xf14 net/ipv6/route.c:3791
 addrconf_f6i_alloc+0x2c0/0x5cc net/ipv6/route.c:4563
 ipv6_add_addr+0x3d0/0xc9c net/ipv6/addrconf.c:1105
 addrconf_add_linklocal+0x264/0x854 net/ipv6/addrconf.c:3215
 addrconf_addr_gen+0x3d4/0x8f0 net/ipv6/addrconf.c:3346
 addrconf_init_auto_addrs+0x794/0xc9c
 addrconf_notify+0x7e8/0xcb4 net/ipv6/addrconf.c:3642
 notifier_call_chain+0x1a4/0x510 kernel/notifier.c:93
 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:461
 call_netdevice_notifiers_info net/core/dev.c:1935 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1973 [inline]
 call_netdevice_notifiers net/core/dev.c:1987 [inline]
 dev_open+0x1ac/0x244 net/core/dev.c:1456
 ipmr_new_tunnel net/ipv4/ipmr.c:472 [inline]
 vif_add+0x5a8/0x127c net/ipv4/ipmr.c:844
 ip_mroute_setsockopt+0xc18/0xe88 net/ipv4/ipmr.c:1439
 do_ip_setsockopt+0x680/0x2fd8 net/ipv4/ip_sockglue.c:944
 ip_setsockopt+0x80/0x128 net/ipv4/ip_sockglue.c:1448
 raw_setsockopt+0x100/0x294 net/ipv4/raw.c:834