unregister_netdevice: waiting for syz_tun to become free. Usage count = 3
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4046 [inline]
 netdev_tracker_alloc include/linux/netdevice.h:4058 [inline]
 fib6_nh_init+0x604/0x1a08 net/ipv6/route.c:3667
 ip6_route_info_create+0x7d0/0xf9c net/ipv6/route.c:3848
 addrconf_f6i_alloc+0x1a8/0x36c net/ipv6/route.c:4623
 fixup_permanent_addr net/ipv6/addrconf.c:3535 [inline]
 addrconf_permanent_addr+0x208/0x870 net/ipv6/addrconf.c:3574
 addrconf_notify+0x7b8/0xc98 net/ipv6/addrconf.c:3646
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xd8/0x168 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:2014 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline]
 call_netdevice_notifiers net/core/dev.c:2066 [inline]
 __dev_notify_flags+0x260/0x490 net/core/dev.c:8715
 dev_change_flags+0xd0/0x15c net/core/dev.c:8753
 do_setlink+0x9d0/0x2158 net/core/rtnetlink.c:2845
 __rtnl_newlink net/core/rtnetlink.c:3622 [inline]
 rtnl_newlink+0x142c/0x1af0 net/core/rtnetlink.c:3669
 rtnetlink_rcv_msg+0x694/0xcc4 net/core/rtnetlink.c:6166
 netlink_rcv_skb+0x220/0x3ec net/netlink/af_netlink.c:2516
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6184
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x5fc/0x80c net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6f0/0x9d8 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 __sys_sendto+0x324/0x440 net/socket.c:2153
leaked reference.
 __netdev_tracker_alloc include/linux/netdevice.h:4046 [inline]
 netdev_hold include/linux/netdevice.h:4075 [inline]
 ipv6_add_dev+0x334/0xeec net/ipv6/addrconf.c:402
 addrconf_notify+0x504/0xc98 net/ipv6/addrconf.c:3602
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xd8/0x168 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:2014 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline]
 call_netdevice_notifiers+0x110/0x198 net/core/dev.c:2066
 register_netdevice+0x11c4/0x1650 net/core/dev.c:10276
 tun_set_iff+0x624/0xb84 drivers/net/tun.c:2865
 __tun_chr_ioctl+0x780/0x1dac drivers/net/tun.c:3128
 tun_chr_ioctl+0x38/0x4c drivers/net/tun.c:3415
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585