unregister_netdevice: waiting for syz_tun to become free. Usage count = 3
ref_tracker: netdev@ffff8880340b8700 has 1/2 users at
     netdev_get_by_index+0x79/0xb0
     fib6_nh_init+0x285/0x1e40
     ip6_route_info_create_nh+0x16a/0xad0
     addrconf_f6i_alloc+0x3b7/0x630
     ipv6_add_addr+0x59c/0x1110
     inet6_addr_add+0x43c/0xb50
     inet6_rtm_newaddr+0x9fc/0xe00
     rtnetlink_rcv_msg+0x802/0xc00
     netlink_rcv_skb+0x226/0x4a0
     netlink_unicast+0x7bd/0x940
     netlink_sendmsg+0x813/0xb40
     sock_sendmsg_nosec+0x13a/0x180
     __sys_sendto+0x408/0x5a0
     __x64_sys_sendto+0xde/0x100
     do_syscall_64+0x166/0x520
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: netdev@ffff8880340b8700 has 1/2 users at
     ipv6_add_dev+0x50f/0x13a0
     addrconf_notify+0x771/0x1050
     notifier_call_chain+0x1a5/0x3d0
     register_netdevice+0x18a4/0x1eb0
     tun_set_iff+0x82b/0xf20
     __tun_chr_ioctl+0x7e5/0x1e70
     __se_sys_ioctl+0xfc/0x170
     do_syscall_64+0x166/0x520
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

