unregister_netdevice: waiting for syz_tun to become free. Usage count = 4
ref_tracker: netdev@847dc39c has 1/3 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4499 [inline]
     netdev_hold include/linux/netdevice.h:4528 [inline]
     dst_init+0x70/0x124 net/core/dst.c:52
     dst_alloc+0x5c/0x88 net/core/dst.c:94
     rt_dst_alloc+0x2c/0x84 net/ipv4/route.c:1649
     __mkroute_output net/ipv4/route.c:2652 [inline]
     ip_route_output_key_hash_rcu+0x45c/0x894 net/ipv4/route.c:2872
     ip_route_output_key_hash net/ipv4/route.c:2702 [inline]
     __ip_route_output_key include/net/route.h:169 [inline]
     ip_route_output_flow+0x5c/0xd0 net/ipv4/route.c:2929
     ip_route_output_key include/net/route.h:179 [inline]
     geneve_link_config.part.0+0xa8/0x120 drivers/net/geneve.c:2280
     geneve_link_config drivers/net/geneve.c:2274 [inline]
     geneve_newlink+0x104/0x10c drivers/net/geneve.c:2339
     rtnl_newlink_create net/core/rtnetlink.c:3913 [inline]
     __rtnl_newlink net/core/rtnetlink.c:4044 [inline]
     rtnl_newlink+0x470/0xad8 net/core/rtnetlink.c:4159
     rtnetlink_rcv_msg+0x2dc/0x340 net/core/rtnetlink.c:7076
     netlink_rcv_skb+0xc0/0x120 net/netlink/af_netlink.c:2556
     rtnetlink_rcv+0x18/0x1c net/core/rtnetlink.c:7103
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x270/0x380 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x1c8/0x444 net/netlink/af_netlink.c:1900
     sock_sendmsg_nosec net/socket.c:775 [inline]
     __sock_sendmsg+0x44/0x78 net/socket.c:790
     __sys_sendto+0x110/0x160 net/socket.c:2252
     __do_sys_sendto net/socket.c:2259 [inline]
     sys_sendto+0x1c/0x24 net/socket.c:2255

ref_tracker: netdev@847dc39c has 1/3 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4499 [inline]
     netdev_hold include/linux/netdevice.h:4528 [inline]
     netdev_hold include/linux/netdevice.h:4523 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1259 [inline]
     fib_check_nh+0xcc/0x4fc net/ipv4/fib_semantics.c:1279
     fib_create_info+0x83c/0xdf8 net/ipv4/fib_semantics.c:1499
     fib_table_insert+0x68/0x698 net/ipv4/fib_trie.c:1212
     fib_magic+0x120/0x148 net/ipv4/fib_frontend.c:1128
     fib_add_ifaddr+0x160/0x18c net/ipv4/fib_frontend.c:1172
     fib_netdev_event+0xb4/0x198 net/ipv4/fib_frontend.c:1510
     notifier_call_chain+0x8c/0x218 kernel/notifier.c:85
     raw_notifier_call_chain+0x20/0x28 kernel/notifier.c:453
     call_netdevice_notifiers_info+0x54/0xa0 net/core/dev.c:2250
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     __dev_notify_flags+0x60/0xe0 net/core/dev.c:9801
     netif_change_flags+0x54/0x60 net/core/dev.c:9828
     do_setlink+0x308/0x10d0 net/core/rtnetlink.c:3215
     rtnl_changelink net/core/rtnetlink.c:3849 [inline]
     __rtnl_newlink net/core/rtnetlink.c:4022 [inline]
     rtnl_newlink+0x780/0xad8 net/core/rtnetlink.c:4159
     rtnetlink_rcv_msg+0x2dc/0x340 net/core/rtnetlink.c:7076
     netlink_rcv_skb+0xc0/0x120 net/netlink/af_netlink.c:2556
     rtnetlink_rcv+0x18/0x1c net/core/rtnetlink.c:7103

ref_tracker: netdev@847dc39c has 1/3 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4499 [inline]
     netdev_hold include/linux/netdevice.h:4528 [inline]
     netdev_hold include/linux/netdevice.h:4523 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1259 [inline]
     fib_check_nh+0xcc/0x4fc net/ipv4/fib_semantics.c:1279
     fib_create_info+0x83c/0xdf8 net/ipv4/fib_semantics.c:1499
     fib_table_insert+0x68/0x698 net/ipv4/fib_trie.c:1212
     fib_magic+0x120/0x148 net/ipv4/fib_frontend.c:1128
     fib_add_ifaddr+0xe0/0x18c net/ipv4/fib_frontend.c:1165
     fib_netdev_event+0xb4/0x198 net/ipv4/fib_frontend.c:1510
     notifier_call_chain+0x8c/0x218 kernel/notifier.c:85
     raw_notifier_call_chain+0x20/0x28 kernel/notifier.c:453
     call_netdevice_notifiers_info+0x54/0xa0 net/core/dev.c:2250
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     __dev_notify_flags+0x60/0xe0 net/core/dev.c:9801
     netif_change_flags+0x54/0x60 net/core/dev.c:9828
     do_setlink+0x308/0x10d0 net/core/rtnetlink.c:3215
     rtnl_changelink net/core/rtnetlink.c:3849 [inline]
     __rtnl_newlink net/core/rtnetlink.c:4022 [inline]
     rtnl_newlink+0x780/0xad8 net/core/rtnetlink.c:4159
     rtnetlink_rcv_msg+0x2dc/0x340 net/core/rtnetlink.c:7076
     netlink_rcv_skb+0xc0/0x120 net/netlink/af_netlink.c:2556
     rtnetlink_rcv+0x18/0x1c net/core/rtnetlink.c:7103