unregister_netdevice: waiting for syz_tun to become free. Usage count = 1393 ref_tracker: netdev@ffff88807749c620 has 346/1392 users at __netdev_tracker_alloc include/linux/netdevice.h:4435 [inline] netdev_tracker_alloc include/linux/netdevice.h:4447 [inline] netdev_get_by_index+0x79/0xb0 net/core/dev.c:1027 fib6_nh_init+0x202/0x1f90 net/ipv6/route.c:3600 ip6_route_info_create_nh+0x16a/0xad0 net/ipv6/route.c:3899 ip6_route_add+0x6e/0x1b0 net/ipv6/route.c:3951 addrconf_prefix_route+0x3a2/0x480 net/ipv6/addrconf.c:2487 addrconf_add_linklocal+0x266/0x460 net/ipv6/addrconf.c:3312 addrconf_addr_gen+0x2f8/0x360 net/ipv6/addrconf.c:3446 addrconf_notify+0xb1e/0x1050 net/ipv6/addrconf.c:3744 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9803 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9832 do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3158 rtnl_group_changelink net/core/rtnetlink.c:3790 [inline] __rtnl_newlink net/core/rtnetlink.c:3944 [inline] rtnl_newlink+0x147a/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 ref_tracker: netdev@ffff88807749c620 has 346/1392 users at __netdev_tracker_alloc include/linux/netdevice.h:4435 [inline] netdev_tracker_alloc include/linux/netdevice.h:4447 [inline] netdev_get_by_index+0x79/0xb0 net/core/dev.c:1027 fib6_nh_init+0x202/0x1f90 net/ipv6/route.c:3600 ip6_route_info_create_nh+0x16a/0xad0 net/ipv6/route.c:3899 ip6_route_add+0x6e/0x1b0 net/ipv6/route.c:3951 addrconf_add_mroute+0x2d1/0x370 net/ipv6/addrconf.c:2551 addrconf_add_dev net/ipv6/addrconf.c:2569 [inline] addrconf_dev_config net/ipv6/addrconf.c:3483 [inline] addrconf_init_auto_addrs+0x4d7/0xa50 net/ipv6/addrconf.c:3571 addrconf_notify+0xb1e/0x1050 net/ipv6/addrconf.c:3744 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9803 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9832 do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3158 rtnl_group_changelink net/core/rtnetlink.c:3790 [inline] __rtnl_newlink net/core/rtnetlink.c:3944 [inline] rtnl_newlink+0x147a/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 ref_tracker: netdev@ffff88807749c620 has 346/1392 users at __netdev_tracker_alloc include/linux/netdevice.h:4435 [inline] netdev_hold include/linux/netdevice.h:4464 [inline] fib_check_nh_nongw net/ipv4/fib_semantics.c:1262 [inline] fib_check_nh+0xd64/0x1b40 net/ipv4/fib_semantics.c:1282 fib_create_info+0x208c/0x31f0 net/ipv4/fib_semantics.c:1502 fib_table_insert+0xc8/0x1b50 net/ipv4/fib_trie.c:1212 fib_magic+0x434/0x510 net/ipv4/fib_frontend.c:1134 fib_add_ifaddr+0x3fb/0x5f0 net/ipv4/fib_frontend.c:1178 fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1516 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9803 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9832 do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3158 rtnl_group_changelink net/core/rtnetlink.c:3790 [inline] __rtnl_newlink net/core/rtnetlink.c:3944 [inline] rtnl_newlink+0x147a/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x972/0x9f0 net/socket.c:2592 ref_tracker: netdev@ffff88807749c620 has 346/1392 users at __netdev_tracker_alloc include/linux/netdevice.h:4435 [inline] netdev_hold include/linux/netdevice.h:4464 [inline] fib_check_nh_nongw net/ipv4/fib_semantics.c:1262 [inline] fib_check_nh+0xd64/0x1b40 net/ipv4/fib_semantics.c:1282 fib_create_info+0x208c/0x31f0 net/ipv4/fib_semantics.c:1502 fib_table_insert+0xc8/0x1b50 net/ipv4/fib_trie.c:1212 fib_magic+0x434/0x510 net/ipv4/fib_frontend.c:1134 fib_add_ifaddr+0x38d/0x5f0 net/ipv4/fib_frontend.c:1171 fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1516 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9803 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9832 do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3158 rtnl_group_changelink net/core/rtnetlink.c:3790 [inline] __rtnl_newlink net/core/rtnetlink.c:3944 [inline] rtnl_newlink+0x147a/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0x972/0x9f0 net/socket.c:2592 ref_tracker: netdev@ffff88807749c620 has 7/1392 users at __netdev_tracker_alloc include/linux/netdevice.h:4435 [inline] netdev_tracker_alloc include/linux/netdevice.h:4447 [inline] netdev_get_by_index+0x79/0xb0 net/core/dev.c:1027 fib6_nh_init+0x202/0x1f90 net/ipv6/route.c:3600 ip6_route_info_create_nh+0x16a/0xad0 net/ipv6/route.c:3899 addrconf_f6i_alloc+0x3b7/0x630 net/ipv6/route.c:4691 ipv6_add_addr+0x59c/0x1100 net/ipv6/addrconf.c:1125 addrconf_add_linklocal+0x20c/0x460 net/ipv6/addrconf.c:3310 addrconf_addr_gen+0x2f8/0x360 net/ipv6/addrconf.c:3446 addrconf_notify+0xb1e/0x1050 net/ipv6/addrconf.c:3744 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x1a9/0x310 net/core/dev.c:9803 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9832 do_setlink+0xf82/0x4590 net/core/rtnetlink.c:3158 rtnl_group_changelink net/core/rtnetlink.c:3790 [inline] __rtnl_newlink net/core/rtnetlink.c:3944 [inline] rtnl_newlink+0x147a/0x1be0 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 ref_tracker: netdev@ffff88807749c620 has 1/1392 users at fib_create_info+0x22e0/0x31f0 net/ipv4/fib_semantics.c:1496 fib_table_insert+0xc8/0x1b50 net/ipv4/fib_trie.c:1212 fib_magic+0x434/0x510 net/ipv4/fib_frontend.c:1134 fib_add_ifaddr+0x144/0x5f0 net/ipv4/fib_frontend.c:1156 fib_inetaddr_event+0x12e/0x190 net/ipv4/fib_frontend.c:1470 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85 blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:380 __inet_insert_ifa+0x9e9/0xbc0 net/ipv4/devinet.c:566 inet_rtm_newaddr+0x10d8/0x1ad0 net/ipv4/devinet.c:1001 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] __sys_sendto+0x672/0x710 net/socket.c:2206 __do_sys_sendto net/socket.c:2213 [inline] __se_sys_sendto net/socket.c:2209 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2209 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94