unregister_netdevice: waiting for syz_tun to become free. Usage count = 3
ref_tracker: netdev@ffff8880217ac620 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4403 [inline]
     netdev_hold include/linux/netdevice.h:4432 [inline]
     dst_init+0xd9/0x480 net/core/dst.c:52
     dst_alloc+0x12a/0x170 net/core/dst.c:94
     rt_dst_alloc net/ipv4/route.c:1651 [inline]
     __mkroute_output net/ipv4/route.c:2655 [inline]
     ip_route_output_key_hash_rcu+0x14d0/0x25d0 net/ipv4/route.c:2875
     ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2705
     __ip_route_output_key include/net/route.h:169 [inline]
     ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2932
     ip_route_output_key include/net/route.h:179 [inline]
     geneve_link_config+0x1a5/0x660 drivers/net/geneve.c:2106
     geneve_newlink+0x1ed/0x260 drivers/net/geneve.c:2164
     rtnl_newlink_create+0x329/0xb70 net/core/rtnetlink.c:3840
     __rtnl_newlink net/core/rtnetlink.c:3957 [inline]
     rtnl_newlink+0x1666/0x1be0 net/core/rtnetlink.c:4072
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
     netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
     sock_sendmsg_nosec net/socket.c:727 [inline]
     __sock_sendmsg net/socket.c:742 [inline]
     __sys_sendto+0x709/0x7a0 net/socket.c:2206
     __do_sys_sendto net/socket.c:2213 [inline]
     __se_sys_sendto net/socket.c:2209 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2209
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94

ref_tracker: netdev@ffff8880217ac620 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4403 [inline]
     netdev_hold include/linux/netdevice.h:4432 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1263 [inline]
     fib_check_nh+0xd64/0x1b40 net/ipv4/fib_semantics.c:1283
     fib_create_info+0x2085/0x31f0 net/ipv4/fib_semantics.c:1503
     fib_table_insert+0xc8/0x1b50 net/ipv4/fib_trie.c:1212
     fib_magic+0x434/0x510 net/ipv4/fib_frontend.c:1134
     fib_add_ifaddr+0x38d/0x5f0 net/ipv4/fib_frontend.c:1171
     fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1516
     notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
     call_netdevice_notifiers_extack net/core/dev.c:2280 [inline]
     call_netdevice_notifiers net/core/dev.c:2294 [inline]
     __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9787
     netif_change_flags+0xe8/0x1a0 net/core/dev.c:9816
     do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3158
     rtnl_changelink net/core/rtnetlink.c:3776 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3935 [inline]
     rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4072
     rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958
     netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
     netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344
     netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894
     sock_sendmsg_nosec net/socket.c:727 [inline]
     __sock_sendmsg net/socket.c:742 [inline]
     __sys_sendto+0x709/0x7a0 net/socket.c:2206