unregister_netdevice: waiting for syz_tun to become free. Usage count = 4
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4051 [inline]
 netdev_hold include/linux/netdevice.h:4080 [inline]
 dst_init+0xda/0x410 net/core/dst.c:52
 dst_alloc+0x12a/0x160 net/core/dst.c:92
 ip6_dst_alloc net/ipv6/route.c:345 [inline]
 ip6_rt_pcpu_alloc net/ipv6/route.c:1412 [inline]
 rt6_make_pcpu_route net/ipv6/route.c:1461 [inline]
 ip6_pol_route+0x94d/0x1260 net/ipv6/route.c:2295
 pol_lookup_func include/net/ip6_fib.h:579 [inline]
 fib6_rule_lookup+0x2fc/0x570 net/ipv6/fib6_rules.c:121
 ip6_route_output_flags+0xe3/0x330 net/ipv6/route.c:2679
 ip6_route_output include/net/ip6_route.h:98 [inline]
 rxrpc_assess_MTU_size net/rxrpc/peer_object.c:189 [inline]
 rxrpc_init_peer+0x187/0x6d0 net/rxrpc/peer_object.c:250
 rxrpc_create_peer net/rxrpc/peer_object.c:295 [inline]
 rxrpc_lookup_peer+0x42b/0x800 net/rxrpc/peer_object.c:352
 rxrpc_prep_call net/rxrpc/conn_client.c:366 [inline]
 rxrpc_connect_call+0x121/0x1540 net/rxrpc/conn_client.c:716
 rxrpc_new_client_call+0x85f/0xd30 net/rxrpc/call_object.c:352
 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:632 [inline]
 rxrpc_do_sendmsg+0xa9a/0x1090 net/rxrpc/sendmsg.c:686
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x59b/0x970 net/socket.c:2519
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x19e/0x270 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4051 [inline]
 netdev_tracker_alloc include/linux/netdevice.h:4063 [inline]
 fib6_nh_init+0x7b2/0x1e90 net/ipv6/route.c:3665
 ip6_route_info_create+0x952/0x1210 net/ipv6/route.c:3846
 ip6_route_add+0x24/0x130 net/ipv6/route.c:3890
 addrconf_prefix_route net/ipv6/addrconf.c:2442 [inline]
 fixup_permanent_addr net/ipv6/addrconf.c:3543 [inline]
 addrconf_permanent_addr+0x652/0x980 net/ipv6/addrconf.c:3567
 addrconf_notify+0x986/0xf40 net/ipv6/addrconf.c:3639
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 __dev_notify_flags+0x178/0x2d0 net/core/dev.c:-1
 dev_change_flags+0xe3/0x1a0 net/core/dev.c:8714
 do_setlink+0xc31/0x3c40 net/core/rtnetlink.c:2833
 __rtnl_newlink net/core/rtnetlink.c:3608 [inline]
 rtnl_newlink+0x17d6/0x1ff0 net/core/rtnetlink.c:3655
 rtnetlink_rcv_msg+0x79b/0xed0 net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x1de/0x420 net/netlink/af_netlink.c:2511
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x89e/0xbc0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 __sys_sendto+0x44f/0x5c0 net/socket.c:2153
 __do_sys_sendto net/socket.c:2165 [inline]
 __se_sys_sendto net/socket.c:2161 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2161
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4051 [inline]
 netdev_hold include/linux/netdevice.h:4080 [inline]
 ipv6_add_dev+0x3e4/0x1120 net/ipv6/addrconf.c:402
 addrconf_notify+0x634/0xf40 net/ipv6/addrconf.c:3595
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
 call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
 call_netdevice_notifiers net/core/dev.c:2053 [inline]
 register_netdevice+0x1600/0x1aa0 net/core/dev.c:10237
 tun_set_iff+0x848/0xed0 drivers/net/tun.c:2851
 __tun_chr_ioctl+0x730/0x1e10 drivers/net/tun.c:3114
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2