unregister_netdevice: waiting for syz_tun to become free. Usage count = 8
ref_tracker: syz_tun@00000000e03523b9 has 1/7 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4074 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:916
     fib6_nh_init+0x1ac/0x1c58 net/ipv6/route.c:3543
     ip6_route_info_create+0x790/0xefc net/ipv6/route.c:3809
     ip6_route_add+0x38/0x194 net/ipv6/route.c:3853
     addrconf_prefix_route net/ipv6/addrconf.c:2486 [inline]
     addrconf_add_linklocal+0x4cc/0x8b4 net/ipv6/addrconf.c:3319
     addrconf_addr_gen+0x3d4/0x8f4 net/ipv6/addrconf.c:3448
     addrconf_init_auto_addrs+0x798/0xca0
     addrconf_notify+0x8d0/0xce8 net/ipv6/addrconf.c:3745
     notifier_call_chain+0x1b4/0x538 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:8922
     do_setlink+0xadc/0x3778 net/core/rtnetlink.c:2929
     __rtnl_newlink net/core/rtnetlink.c:3725 [inline]
     rtnl_newlink+0x14c4/0x1bd0 net/core/rtnetlink.c:3772
     rtnetlink_rcv_msg+0x630/0xa9c net/core/rtnetlink.c:6675
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2551

ref_tracker: syz_tun@00000000e03523b9 has 1/7 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4074 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:916
     fib6_nh_init+0x1ac/0x1c58 net/ipv6/route.c:3543
     ip6_route_info_create+0x790/0xefc net/ipv6/route.c:3809
     addrconf_f6i_alloc+0x2c4/0x5d0 net/ipv6/route.c:4588
     ipv6_add_addr+0x4b4/0xde8 net/ipv6/addrconf.c:1120
     addrconf_add_linklocal+0x2c4/0x8b4 net/ipv6/addrconf.c:3317
     addrconf_addr_gen+0x3d4/0x8f4 net/ipv6/addrconf.c:3448
     addrconf_init_auto_addrs+0x798/0xca0
     addrconf_notify+0x8d0/0xce8 net/ipv6/addrconf.c:3745
     notifier_call_chain+0x1b4/0x538 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:8922
     do_setlink+0xadc/0x3778 net/core/rtnetlink.c:2929
     __rtnl_newlink net/core/rtnetlink.c:3725 [inline]
     rtnl_newlink+0x14c4/0x1bd0 net/core/rtnetlink.c:3772
     rtnetlink_rcv_msg+0x630/0xa9c net/core/rtnetlink.c:6675

ref_tracker: syz_tun@00000000e03523b9 has 1/7 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4074 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:916
     fib6_nh_init+0x1ac/0x1c58 net/ipv6/route.c:3543
     ip6_route_info_create+0x790/0xefc net/ipv6/route.c:3809
     ip6_route_add+0x38/0x194 net/ipv6/route.c:3853
     addrconf_add_mroute net/ipv6/addrconf.c:2550 [inline]
     addrconf_add_dev+0x2b8/0x458 net/ipv6/addrconf.c:2568
     addrconf_dev_config net/ipv6/addrconf.c:3484 [inline]
     addrconf_init_auto_addrs+0x70c/0xca0 net/ipv6/addrconf.c:3572
     addrconf_notify+0x8d0/0xce8 net/ipv6/addrconf.c:3745
     notifier_call_chain+0x1b4/0x538 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:8922
     do_setlink+0xadc/0x3778 net/core/rtnetlink.c:2929
     __rtnl_newlink net/core/rtnetlink.c:3725 [inline]
     rtnl_newlink+0x14c4/0x1bd0 net/core/rtnetlink.c:3772
     rtnetlink_rcv_msg+0x630/0xa9c net/core/rtnetlink.c:6675
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2551
     rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6693

ref_tracker: syz_tun@00000000e03523b9 has 1/7 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4074 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:916
     fib6_nh_init+0x1ac/0x1c58 net/ipv6/route.c:3543
     ip6_route_info_create+0x790/0xefc net/ipv6/route.c:3809
     ip6_route_add+0x38/0x194 net/ipv6/route.c:3853
     addrconf_prefix_route net/ipv6/addrconf.c:2486 [inline]
     fixup_permanent_addr net/ipv6/addrconf.c:3603 [inline]
     addrconf_permanent_addr+0x670/0xaf0 net/ipv6/addrconf.c:3627
     addrconf_notify+0x7bc/0xce8 net/ipv6/addrconf.c:3699
     notifier_call_chain+0x1b4/0x538 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:8922
     do_setlink+0xadc/0x3778 net/core/rtnetlink.c:2929
     __rtnl_newlink net/core/rtnetlink.c:3725 [inline]
     rtnl_newlink+0x14c4/0x1bd0 net/core/rtnetlink.c:3772
     rtnetlink_rcv_msg+0x630/0xa9c net/core/rtnetlink.c:6675
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2551
     rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6693
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x668/0x8a4 net/netlink/af_netlink.c:1357

ref_tracker: syz_tun@00000000e03523b9 has 1/7 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4074 [inline]
     netdev_get_by_index+0x88/0xe4 net/core/dev.c:916
     fib6_nh_init+0x1ac/0x1c58 net/ipv6/route.c:3543
     ip6_route_info_create+0x790/0xefc net/ipv6/route.c:3809
     addrconf_f6i_alloc+0x2c4/0x5d0 net/ipv6/route.c:4588
     fixup_permanent_addr net/ipv6/addrconf.c:3588 [inline]
     addrconf_permanent_addr+0x244/0xaf0 net/ipv6/addrconf.c:3627
     addrconf_notify+0x7bc/0xce8 net/ipv6/addrconf.c:3699
     notifier_call_chain+0x1b4/0x538 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:8922
     do_setlink+0xadc/0x3778 net/core/rtnetlink.c:2929
     __rtnl_newlink net/core/rtnetlink.c:3725 [inline]
     rtnl_newlink+0x14c4/0x1bd0 net/core/rtnetlink.c:3772
     rtnetlink_rcv_msg+0x630/0xa9c net/core/rtnetlink.c:6675
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2551
     rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6693
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x668/0x8a4 net/netlink/af_netlink.c:1357

ref_tracker: syz_tun@00000000e03523b9 has 1/7 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_hold include/linux/netdevice.h:4091 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1238 [inline]
     fib_check_nh+0xa84/0x17a4 net/ipv4/fib_semantics.c:1258
     fib_create_info+0x105c/0x1e04 net/ipv4/fib_semantics.c:1556
     fib_table_insert+0x1a4/0x1574 net/ipv4/fib_trie.c:1237
     fib_magic+0x300/0x4b8 net/ipv4/fib_frontend.c:1104
     fib_add_ifaddr+0x33c/0x4ec net/ipv4/fib_frontend.c:1148
     fib_netdev_event+0x368/0x4ac net/ipv4/fib_frontend.c:1486
     notifier_call_chain+0x1b4/0x538 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:8922
     do_setlink+0xadc/0x3778 net/core/rtnetlink.c:2929
     __rtnl_newlink net/core/rtnetlink.c:3725 [inline]
     rtnl_newlink+0x14c4/0x1bd0 net/core/rtnetlink.c:3772
     rtnetlink_rcv_msg+0x630/0xa9c net/core/rtnetlink.c:6675
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2551
     rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6693
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x668/0x8a4 net/netlink/af_netlink.c:1357

ref_tracker: syz_tun@00000000e03523b9 has 1/7 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline]
     netdev_tracker_alloc+0x68/0xb4 include/linux/netdevice.h:4074
     fib_create_info+0x1214/0x1e04 net/ipv4/fib_semantics.c:1550
     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+0x1b4/0x538 kernel/notifier.c:93
     blocking_notifier_call_chain+0x70/0xa0 kernel/notifier.c:388
     __inet_insert_ifa+0x8b0/0xac8 net/ipv4/devinet.c:586
     inet_rtm_newaddr+0xf90/0x18e4 net/ipv4/devinet.c:997
     rtnetlink_rcv_msg+0x630/0xa9c net/core/rtnetlink.c:6675
     netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2551
     rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6693
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x668/0x8a4 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x7a4/0xa8c net/netlink/af_netlink.c:1901
     sock_sendmsg_nosec net/socket.c:729 [inline]
     __sock_sendmsg net/socket.c:744 [inline]
     __sys_sendto+0x374/0x4f4 net/socket.c:2214