unregister_netdevice: waiting for syz_tun to become free. Usage count = 3
ref_tracker: syz_tun@0000000080f3519b has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4136 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4148 [inline]
     netdev_get_by_index+0x5c/0xa4 net/core/dev.c:916
     fib6_nh_init+0x4b0/0x1470 net/ipv6/route.c:3543
     ip6_route_info_create+0xbc0/0x1230 net/ipv6/route.c:3809
     ip6_route_add+0x20/0x180 net/ipv6/route.c:3853
     addrconf_add_mroute+0x184/0x260 net/ipv6/addrconf.c:2550
     addrconf_add_dev+0xd8/0x130 net/ipv6/addrconf.c:2568
     addrconf_dev_config net/ipv6/addrconf.c:3503 [inline]
     addrconf_init_auto_addrs+0x15c/0x568 net/ipv6/addrconf.c:3591
     addrconf_notify+0x980/0x1144 net/ipv6/addrconf.c:3764
     notifier_call_chain+0x118/0x49c kernel/notifier.c:85
     raw_notifier_call_chain+0x18/0x24 kernel/notifier.c:453
     call_netdevice_notifiers_info+0x88/0xe8 net/core/dev.c:1996
     call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
     call_netdevice_notifiers net/core/dev.c:2048 [inline]
     __dev_notify_flags+0xbc/0x20c net/core/dev.c:8988
     dev_change_flags+0xe0/0x150 net/core/dev.c:9026
     do_setlink.constprop.0+0x6fc/0x2ccc net/core/rtnetlink.c:3109
     rtnl_changelink net/core/rtnetlink.c:3723 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3875 [inline]
     rtnl_newlink+0xd08/0x15b4 net/core/rtnetlink.c:4012
     rtnetlink_rcv_msg+0x65c/0x8d4 net/core/rtnetlink.c:6922

ref_tracker: syz_tun@0000000080f3519b has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4136 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4148 [inline]
     fib_create_info+0x290c/0x3ef8 net/ipv4/fib_semantics.c:1527
     fib_table_insert+0x148/0x1c3c net/ipv4/fib_trie.c:1231
     fib_magic+0x380/0x44c net/ipv4/fib_frontend.c:1112
     fib_add_ifaddr+0x14c/0x43c net/ipv4/fib_frontend.c:1134
     fib_inetaddr_event+0xbc/0x264 net/ipv4/fib_frontend.c:1448
     notifier_call_chain+0x118/0x49c kernel/notifier.c:85
     blocking_notifier_call_chain kernel/notifier.c:380 [inline]
     blocking_notifier_call_chain+0x68/0x9c kernel/notifier.c:368
     __inet_insert_ifa+0x684/0x954 net/ipv4/devinet.c:575
     inet_rtm_newaddr+0xba4/0x10c0 net/ipv4/devinet.c:1010
     rtnetlink_rcv_msg+0x65c/0x8d4 net/core/rtnetlink.c:6922
     netlink_rcv_skb+0x190/0x334 net/netlink/af_netlink.c:2542
     rtnetlink_rcv+0x18/0x24 net/core/rtnetlink.c:6949
     netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
     netlink_unicast+0x3c4/0x674 net/netlink/af_netlink.c:1347
     netlink_sendmsg+0x654/0xa4c net/netlink/af_netlink.c:1891
     sock_sendmsg_nosec net/socket.c:711 [inline]
     __sock_sendmsg+0xc8/0x168 net/socket.c:726
     __sys_sendto+0x1d8/0x26c net/socket.c:2197