unregister_netdevice: waiting for syz_tun to become free. Usage count = 7
ref_tracker: syz_tun@000000000d469e1d has 1/6 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4064 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4076 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:885
     fib6_nh_init+0x1ac/0x1c60 net/ipv6/route.c:3541
     ip6_route_info_create+0x794/0xf00 net/ipv6/route.c:3807
     ip6_route_add+0x38/0x194 net/ipv6/route.c:3851
     addrconf_prefix_route net/ipv6/addrconf.c:2484 [inline]
     addrconf_add_linklocal+0x4cc/0x8b4 net/ipv6/addrconf.c:3315
     addrconf_addr_gen+0x3d4/0x8f4 net/ipv6/addrconf.c:3444
     addrconf_init_auto_addrs+0x798/0xca0
     addrconf_notify+0x8d0/0xce8 net/ipv6/addrconf.c:3741
     notifier_call_chain+0x1bc/0x540 kernel/notifier.c:93
     raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:461
     __dev_notify_flags+0x2c4/0x550
     dev_change_flags+0xd0/0x15c net/core/dev.c:8763
     do_setlink+0xadc/0x377c net/core/rtnetlink.c:2884
     __rtnl_newlink net/core/rtnetlink.c:3680 [inline]
     rtnl_newlink+0x14c0/0x1bcc net/core/rtnetlink.c:3727
     rtnetlink_rcv_msg+0x724/0xdbc net/core/rtnetlink.c:6595
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2559

ref_tracker: syz_tun@000000000d469e1d has 1/6 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4064 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4076 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:885
     fib6_nh_init+0x1ac/0x1c60 net/ipv6/route.c:3541
     ip6_route_info_create+0x794/0xf00 net/ipv6/route.c:3807
     addrconf_f6i_alloc+0x2c4/0x5d0 net/ipv6/route.c:4583
     ipv6_add_addr+0x4b4/0xde8 net/ipv6/addrconf.c:1119
     addrconf_add_linklocal+0x2c4/0x8b4 net/ipv6/addrconf.c:3313
     addrconf_addr_gen+0x3d4/0x8f4 net/ipv6/addrconf.c:3444
     addrconf_init_auto_addrs+0x798/0xca0
     addrconf_notify+0x8d0/0xce8 net/ipv6/addrconf.c:3741
     notifier_call_chain+0x1bc/0x540 kernel/notifier.c:93
     raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:461
     __dev_notify_flags+0x2c4/0x550
     dev_change_flags+0xd0/0x15c net/core/dev.c:8763
     do_setlink+0xadc/0x377c net/core/rtnetlink.c:2884
     __rtnl_newlink net/core/rtnetlink.c:3680 [inline]
     rtnl_newlink+0x14c0/0x1bcc net/core/rtnetlink.c:3727
     rtnetlink_rcv_msg+0x724/0xdbc net/core/rtnetlink.c:6595

ref_tracker: syz_tun@000000000d469e1d has 1/6 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4064 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4076 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:885
     fib6_nh_init+0x1ac/0x1c60 net/ipv6/route.c:3541
     ip6_route_info_create+0x794/0xf00 net/ipv6/route.c:3807
     ip6_route_add+0x38/0x194 net/ipv6/route.c:3851
     addrconf_add_mroute net/ipv6/addrconf.c:2548 [inline]
     addrconf_add_dev+0x2b8/0x458 net/ipv6/addrconf.c:2566
     addrconf_dev_config net/ipv6/addrconf.c:3480 [inline]
     addrconf_init_auto_addrs+0x70c/0xca0 net/ipv6/addrconf.c:3568
     addrconf_notify+0x8d0/0xce8 net/ipv6/addrconf.c:3741
     notifier_call_chain+0x1bc/0x540 kernel/notifier.c:93
     raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:461
     __dev_notify_flags+0x2c4/0x550
     dev_change_flags+0xd0/0x15c net/core/dev.c:8763
     do_setlink+0xadc/0x377c net/core/rtnetlink.c:2884
     __rtnl_newlink net/core/rtnetlink.c:3680 [inline]
     rtnl_newlink+0x14c0/0x1bcc net/core/rtnetlink.c:3727
     rtnetlink_rcv_msg+0x724/0xdbc net/core/rtnetlink.c:6595
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2559
     rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6613

ref_tracker: syz_tun@000000000d469e1d has 1/6 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4064 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4076 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:885
     fib6_nh_init+0x1ac/0x1c60 net/ipv6/route.c:3541
     ip6_route_info_create+0x794/0xf00 net/ipv6/route.c:3807
     ip6_route_add+0x38/0x194 net/ipv6/route.c:3851
     addrconf_prefix_route net/ipv6/addrconf.c:2484 [inline]
     fixup_permanent_addr net/ipv6/addrconf.c:3599 [inline]
     addrconf_permanent_addr+0x674/0xaf4 net/ipv6/addrconf.c:3623
     addrconf_notify+0x7bc/0xce8 net/ipv6/addrconf.c:3695
     notifier_call_chain+0x1bc/0x540 kernel/notifier.c:93
     raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:461
     __dev_notify_flags+0x2c4/0x550
     dev_change_flags+0xd0/0x15c net/core/dev.c:8763
     do_setlink+0xadc/0x377c net/core/rtnetlink.c:2884
     __rtnl_newlink net/core/rtnetlink.c:3680 [inline]
     rtnl_newlink+0x14c0/0x1bcc net/core/rtnetlink.c:3727
     rtnetlink_rcv_msg+0x724/0xdbc net/core/rtnetlink.c:6595
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2559
     rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6613
     netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
     netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1361

ref_tracker: syz_tun@000000000d469e1d has 1/6 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4064 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4076 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:885
     fib6_nh_init+0x1ac/0x1c60 net/ipv6/route.c:3541
     ip6_route_info_create+0x794/0xf00 net/ipv6/route.c:3807
     addrconf_f6i_alloc+0x2c4/0x5d0 net/ipv6/route.c:4583
     ipv6_add_addr+0x4b4/0xde8 net/ipv6/addrconf.c:1119
     inet6_addr_add+0x460/0x914 net/ipv6/addrconf.c:3058
     inet6_rtm_newaddr+0x68c/0xa4c net/ipv6/addrconf.c:5046
     rtnetlink_rcv_msg+0x724/0xdbc net/core/rtnetlink.c:6595
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2559
     rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6613
     netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
     netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1361
     netlink_sendmsg+0x7a0/0xa84 net/netlink/af_netlink.c:1905
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg net/socket.c:745 [inline]
     __sys_sendto+0x374/0x4f4 net/socket.c:2191
     __do_sys_sendto net/socket.c:2203 [inline]
     __se_sys_sendto net/socket.c:2199 [inline]
     __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2199
     __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
     invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
     el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133

ref_tracker: syz_tun@000000000d469e1d has 1/6 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4064 [inline]
     netdev_tracker_alloc+0x68/0xb4 include/linux/netdevice.h:4076
     fib_create_info+0x126c/0x1e64 net/ipv4/fib_semantics.c:1552
     fib_table_insert+0x1a4/0x1574 net/ipv4/fib_trie.c:1237
     fib_magic+0x300/0x4b8 net/ipv4/fib_frontend.c:1104
     fib_add_ifaddr+0x118/0x4ec net/ipv4/fib_frontend.c:1126
     fib_inetaddr_event+0x12c/0x200 net/ipv4/fib_frontend.c:1440
     notifier_call_chain+0x1bc/0x540 kernel/notifier.c:93
     blocking_notifier_call_chain+0x70/0xa0 kernel/notifier.c:388
     __inet_insert_ifa+0x8b0/0xac8 net/ipv4/devinet.c:556
     inet_rtm_newaddr+0xf90/0x18e4 net/ipv4/devinet.c:981
     rtnetlink_rcv_msg+0x724/0xdbc net/core/rtnetlink.c:6595
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2559
     rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6613
     netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
     netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1361
     netlink_sendmsg+0x7a0/0xa84 net/netlink/af_netlink.c:1905
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg net/socket.c:745 [inline]
     __sys_sendto+0x374/0x4f4 net/socket.c:2191