unregister_netdevice: waiting for syz_tun to become free. Usage count = 3
ref_tracker: netdev@ffff888038260658 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline]
     netdev_hold include/linux/netdevice.h:4500 [inline]
     dst_init+0xda/0x5b0 net/core/dst.c:52
     dst_alloc+0xbb/0x1a0 net/core/dst.c:94
     rt_dst_alloc+0x35/0x3a0 net/ipv4/route.c:1651
     __mkroute_output net/ipv4/route.c:2655 [inline]
     ip_route_output_key_hash_rcu+0x87a/0x2870 net/ipv4/route.c:2875
     ip_route_output_key_hash+0x118/0x2b0 net/ipv4/route.c:2705
     __ip_route_output_key include/net/route.h:169 [inline]
     ip_route_output_flow+0x27/0x150 net/ipv4/route.c:2932
     ip_route_output_key include/net/route.h:179 [inline]
     geneve_link_config.part.0+0x23e/0x5b0 drivers/net/geneve.c:2105
     geneve_link_config include/net/rtnetlink.h:95 [inline]
     geneve_newlink+0x334/0x390 drivers/net/geneve.c:2163
     rtnl_newlink_create net/core/rtnetlink.c:3864 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3995 [inline]
     rtnl_newlink+0x1499/0x2380 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
     netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1344
     netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894
     sock_sendmsg_nosec net/socket.c:787 [inline]
     __sock_sendmsg net/socket.c:802 [inline]
     __sys_sendto+0x468/0x4b0 net/socket.c:2265
     __do_sys_sendto net/socket.c:2272 [inline]
     __se_sys_sendto net/socket.c:2268 [inline]
     __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2268
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94

ref_tracker: netdev@ffff888038260658 has 1/2 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline]
     netdev_hold include/linux/netdevice.h:4500 [inline]
     netdev_hold include/linux/netdevice.h:4495 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1261 [inline]
     fib_check_nh+0x271/0x620 net/ipv4/fib_semantics.c:1281
     fib_create_info+0x218e/0x4640 net/ipv4/fib_semantics.c:1501
     fib_table_insert+0x169/0x1c70 net/ipv4/fib_trie.c:1212
     fib_magic+0x4d4/0x5c0 net/ipv4/fib_frontend.c:1134
     fib_add_ifaddr+0x3a1/0x560 net/ipv4/fib_frontend.c:1171
     fib_netdev_event+0x3d6/0x710 net/ipv4/fib_frontend.c:1516
     notifier_call_chain+0x99/0x400 kernel/notifier.c:85
     call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2249
     call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
     call_netdevice_notifiers net/core/dev.c:2301 [inline]
     __dev_notify_flags+0x12c/0x2e0 net/core/dev.c:9794
     netif_change_flags+0x108/0x160 net/core/dev.c:9823
     do_setlink.isra.0+0x1ac4/0x3e60 net/core/rtnetlink.c:3181
     rtnl_changelink net/core/rtnetlink.c:3800 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3973 [inline]
     rtnl_newlink+0x11c2/0x2380 net/core/rtnetlink.c:4110
     rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6996
     netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
     netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1344
     netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1894