unregister_netdevice: waiting for syz_tun to become free. Usage count = 16063
ref_tracker: syz_tun@ffff88803101c610 has 3213/16062 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4341 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4353 [inline]
     netdev_get_by_index+0x79/0xb0 net/core/dev.c:1008
     fib6_nh_init+0x1cd/0x1ff0 net/ipv6/route.c:3592
     ip6_route_info_create_nh+0x16a/0xab0 net/ipv6/route.c:3845
     addrconf_f6i_alloc+0x203/0x450 net/ipv6/route.c:4683
     ipv6_add_addr+0x56e/0x1090 net/ipv6/addrconf.c:1121
     addrconf_add_linklocal+0x28c/0x6c0 net/ipv6/addrconf.c:3310
     addrconf_addr_gen+0x490/0x580 net/ipv6/addrconf.c:3441
     addrconf_init_auto_addrs+0x711/0xb50 net/ipv6/addrconf.c:-1
     addrconf_notify+0xacc/0x1010 net/ipv6/addrconf.c:3744
     notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
     call_netdevice_notifiers net/core/dev.c:2282 [inline]
     __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9526
     do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3141
     rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3927 [inline]
     rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4055
     rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944
     netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534

ref_tracker: syz_tun@ffff88803101c610 has 3212/16062 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4341 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4353 [inline]
     netdev_get_by_index+0x79/0xb0 net/core/dev.c:1008
     fib6_nh_init+0x1cd/0x1ff0 net/ipv6/route.c:3592
     ip6_route_info_create_nh+0x16a/0xab0 net/ipv6/route.c:3845
     ip6_route_add+0x4d/0x190 net/ipv6/route.c:3893
     addrconf_prefix_route net/ipv6/addrconf.c:2487 [inline]
     addrconf_add_linklocal+0x45f/0x6c0 net/ipv6/addrconf.c:3312
     addrconf_addr_gen+0x490/0x580 net/ipv6/addrconf.c:3441
     addrconf_init_auto_addrs+0x711/0xb50 net/ipv6/addrconf.c:-1
     addrconf_notify+0xacc/0x1010 net/ipv6/addrconf.c:3744
     notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
     call_netdevice_notifiers net/core/dev.c:2282 [inline]
     __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9526
     do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3141
     rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3927 [inline]
     rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4055
     rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944
     netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534
     netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
     netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339

ref_tracker: syz_tun@ffff88803101c610 has 3212/16062 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4341 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4353 [inline]
     netdev_get_by_index+0x79/0xb0 net/core/dev.c:1008
     fib6_nh_init+0x1cd/0x1ff0 net/ipv6/route.c:3592
     ip6_route_info_create_nh+0x16a/0xab0 net/ipv6/route.c:3845
     ip6_route_add+0x4d/0x190 net/ipv6/route.c:3893
     addrconf_add_mroute net/ipv6/addrconf.c:2551 [inline]
     addrconf_add_dev+0x24f/0x340 net/ipv6/addrconf.c:2569
     addrconf_dev_config net/ipv6/addrconf.c:3477 [inline]
     addrconf_init_auto_addrs+0x5cf/0xb50 net/ipv6/addrconf.c:3571
     addrconf_notify+0xacc/0x1010 net/ipv6/addrconf.c:3744
     notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
     call_netdevice_notifiers net/core/dev.c:2282 [inline]
     __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9526
     do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3141
     rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3927 [inline]
     rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4055
     rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944
     netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534
     netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
     netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339
     netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883

ref_tracker: syz_tun@ffff88803101c610 has 3212/16062 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4341 [inline]
     netdev_hold include/linux/netdevice.h:4370 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1268 [inline]
     fib_check_nh+0xc46/0x1910 net/ipv4/fib_semantics.c:1288
     fib_create_info+0x209d/0x3210 net/ipv4/fib_semantics.c:1508
     fib_table_insert+0xc6/0x1b50 net/ipv4/fib_trie.c:1212
     fib_magic+0x2c4/0x390 net/ipv4/fib_frontend.c:1133
     fib_add_ifaddr+0x3fb/0x5f0 net/ipv4/fib_frontend.c:1177
     fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1515
     notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
     call_netdevice_notifiers net/core/dev.c:2282 [inline]
     __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9526
     do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3141
     rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3927 [inline]
     rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4055
     rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944
     netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534
     netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
     netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339
     netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
     sock_sendmsg_nosec net/socket.c:712 [inline]
     __sock_sendmsg+0x219/0x270 net/socket.c:727

ref_tracker: syz_tun@ffff88803101c610 has 3212/16062 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4341 [inline]
     netdev_hold include/linux/netdevice.h:4370 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1268 [inline]
     fib_check_nh+0xc46/0x1910 net/ipv4/fib_semantics.c:1288
     fib_create_info+0x209d/0x3210 net/ipv4/fib_semantics.c:1508
     fib_table_insert+0xc6/0x1b50 net/ipv4/fib_trie.c:1212
     fib_magic+0x2c4/0x390 net/ipv4/fib_frontend.c:1133
     fib_add_ifaddr+0x38d/0x5f0 net/ipv4/fib_frontend.c:1170
     fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1515
     notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
     call_netdevice_notifiers net/core/dev.c:2282 [inline]
     __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9526
     do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3141
     rtnl_group_changelink net/core/rtnetlink.c:3773 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3927 [inline]
     rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4055
     rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944
     netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534
     netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
     netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339
     netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
     sock_sendmsg_nosec net/socket.c:712 [inline]
     __sock_sendmsg+0x219/0x270 net/socket.c:727

ref_tracker: syz_tun@ffff88803101c610 has 1/16062 users at
     fib_create_info+0x22f1/0x3210 net/ipv4/fib_semantics.c:1502
     fib_table_insert+0xc6/0x1b50 net/ipv4/fib_trie.c:1212
     fib_magic+0x2c4/0x390 net/ipv4/fib_frontend.c:1133
     fib_add_ifaddr+0x144/0x5f0 net/ipv4/fib_frontend.c:1155
     fib_inetaddr_event+0x12e/0x190 net/ipv4/fib_frontend.c:1469
     notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
     blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:380
     __inet_insert_ifa+0xa13/0xbf0 net/ipv4/devinet.c:567
     inet_rtm_newaddr+0xf3a/0x18b0 net/ipv4/devinet.c:1002
     rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944
     netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2534
     netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
     netlink_unicast+0x75b/0x8d0 net/netlink/af_netlink.c:1339
     netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
     sock_sendmsg_nosec net/socket.c:712 [inline]
     __sock_sendmsg+0x219/0x270 net/socket.c:727
     __sys_sendto+0x3bd/0x520 net/socket.c:2180
     __do_sys_sendto net/socket.c:2187 [inline]
     __se_sys_sendto net/socket.c:2183 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2183