unregister_netdevice: waiting for syz_tun to become free. Usage count = 2006 ref_tracker: syz_tun@ffff888035498620 has 493/2005 users at __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline] netdev_tracker_alloc include/linux/netdevice.h:4074 [inline] netdev_get_by_index+0x7c/0xb0 net/core/dev.c:916 fib6_nh_init+0x792/0x1da0 net/ipv6/route.c:3543 ip6_route_info_create+0x1073/0x1910 net/ipv6/route.c:3809 ip6_route_add+0x26/0x1c0 net/ipv6/route.c:3853 addrconf_prefix_route+0x2fe/0x510 net/ipv6/addrconf.c:2486 addrconf_add_linklocal+0x32a/0x620 net/ipv6/addrconf.c:3319 addrconf_addr_gen+0x36f/0x3c0 net/ipv6/addrconf.c:3448 addrconf_dev_config net/ipv6/addrconf.c:3494 [inline] addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3572 addrconf_notify+0xe91/0x19c0 net/ipv6/addrconf.c:3745 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] __dev_notify_flags+0x12d/0x2e0 net/core/dev.c:8884 dev_change_flags+0x10c/0x160 net/core/dev.c:8922 do_setlink+0x1b0e/0x41c0 net/core/rtnetlink.c:2929 rtnl_group_changelink net/core/rtnetlink.c:3476 [inline] __rtnl_newlink+0xe11/0x1920 net/core/rtnetlink.c:3735 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3772 ref_tracker: syz_tun@ffff888035498620 has 493/2005 users at __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline] netdev_tracker_alloc include/linux/netdevice.h:4074 [inline] netdev_get_by_index+0x7c/0xb0 net/core/dev.c:916 fib6_nh_init+0x792/0x1da0 net/ipv6/route.c:3543 ip6_route_info_create+0x1073/0x1910 net/ipv6/route.c:3809 ip6_route_add+0x26/0x1c0 net/ipv6/route.c:3853 addrconf_add_mroute+0x1de/0x350 net/ipv6/addrconf.c:2550 addrconf_add_dev+0x14e/0x1c0 net/ipv6/addrconf.c:2568 addrconf_dev_config net/ipv6/addrconf.c:3484 [inline] addrconf_init_auto_addrs+0x380/0x820 net/ipv6/addrconf.c:3572 addrconf_notify+0xe91/0x19c0 net/ipv6/addrconf.c:3745 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] __dev_notify_flags+0x12d/0x2e0 net/core/dev.c:8884 dev_change_flags+0x10c/0x160 net/core/dev.c:8922 do_setlink+0x1b0e/0x41c0 net/core/rtnetlink.c:2929 rtnl_group_changelink net/core/rtnetlink.c:3476 [inline] __rtnl_newlink+0xe11/0x1920 net/core/rtnetlink.c:3735 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3772 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6675 ref_tracker: syz_tun@ffff888035498620 has 493/2005 users at __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline] netdev_hold include/linux/netdevice.h:4091 [inline] netdev_hold include/linux/netdevice.h:4086 [inline] fib_check_nh_nongw net/ipv4/fib_semantics.c:1238 [inline] fib_check_nh+0x271/0x620 net/ipv4/fib_semantics.c:1258 fib_create_info+0x23c9/0x4d10 net/ipv4/fib_semantics.c:1556 fib_table_insert+0x1d7/0x1d70 net/ipv4/fib_trie.c:1237 fib_magic+0x4d6/0x5c0 net/ipv4/fib_frontend.c:1104 fib_add_ifaddr+0x4c0/0x560 net/ipv4/fib_frontend.c:1148 fib_netdev_event+0x38a/0x710 net/ipv4/fib_frontend.c:1486 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] __dev_notify_flags+0x12d/0x2e0 net/core/dev.c:8884 dev_change_flags+0x10c/0x160 net/core/dev.c:8922 do_setlink+0x1b0e/0x41c0 net/core/rtnetlink.c:2929 rtnl_group_changelink net/core/rtnetlink.c:3476 [inline] __rtnl_newlink+0xe11/0x1920 net/core/rtnetlink.c:3735 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3772 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6675 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2541 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 ref_tracker: syz_tun@ffff888035498620 has 493/2005 users at __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline] netdev_hold include/linux/netdevice.h:4091 [inline] netdev_hold include/linux/netdevice.h:4086 [inline] fib_check_nh_nongw net/ipv4/fib_semantics.c:1238 [inline] fib_check_nh+0x271/0x620 net/ipv4/fib_semantics.c:1258 fib_create_info+0x23c9/0x4d10 net/ipv4/fib_semantics.c:1556 fib_table_insert+0x1d7/0x1d70 net/ipv4/fib_trie.c:1237 fib_magic+0x4d6/0x5c0 net/ipv4/fib_frontend.c:1104 fib_add_ifaddr+0x393/0x560 net/ipv4/fib_frontend.c:1141 fib_netdev_event+0x38a/0x710 net/ipv4/fib_frontend.c:1486 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] __dev_notify_flags+0x12d/0x2e0 net/core/dev.c:8884 dev_change_flags+0x10c/0x160 net/core/dev.c:8922 do_setlink+0x1b0e/0x41c0 net/core/rtnetlink.c:2929 rtnl_group_changelink net/core/rtnetlink.c:3476 [inline] __rtnl_newlink+0xe11/0x1920 net/core/rtnetlink.c:3735 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3772 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6675 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2541 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 ref_tracker: syz_tun@ffff888035498620 has 32/2005 users at __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline] netdev_tracker_alloc include/linux/netdevice.h:4074 [inline] netdev_get_by_index+0x7c/0xb0 net/core/dev.c:916 fib6_nh_init+0x792/0x1da0 net/ipv6/route.c:3543 ip6_route_info_create+0x1073/0x1910 net/ipv6/route.c:3809 addrconf_f6i_alloc+0x393/0x670 net/ipv6/route.c:4588 ipv6_add_addr+0x538/0x2060 net/ipv6/addrconf.c:1120 addrconf_add_linklocal+0x2a6/0x620 net/ipv6/addrconf.c:3317 addrconf_addr_gen+0x36f/0x3c0 net/ipv6/addrconf.c:3448 addrconf_dev_config net/ipv6/addrconf.c:3494 [inline] addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3572 addrconf_notify+0xe91/0x19c0 net/ipv6/addrconf.c:3745 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] __dev_notify_flags+0x12d/0x2e0 net/core/dev.c:8884 dev_change_flags+0x10c/0x160 net/core/dev.c:8922 do_setlink+0x1b0e/0x41c0 net/core/rtnetlink.c:2929 rtnl_group_changelink net/core/rtnetlink.c:3476 [inline] __rtnl_newlink+0xe11/0x1920 net/core/rtnetlink.c:3735 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3772 ref_tracker: syz_tun@ffff888035498620 has 1/2005 users at __netdev_tracker_alloc include/linux/netdevice.h:4062 [inline] netdev_tracker_alloc include/linux/netdevice.h:4074 [inline] fib_create_info+0x3290/0x4d10 net/ipv4/fib_semantics.c:1550 fib_table_insert+0x1d7/0x1d70 net/ipv4/fib_trie.c:1237 fib_magic+0x4d6/0x5c0 net/ipv4/fib_frontend.c:1104 fib_add_ifaddr+0x174/0x560 net/ipv4/fib_frontend.c:1126 fib_inetaddr_event+0x174/0x2c0 net/ipv4/fib_frontend.c:1440 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 blocking_notifier_call_chain kernel/notifier.c:388 [inline] blocking_notifier_call_chain+0x69/0xa0 kernel/notifier.c:376 __inet_insert_ifa+0x93f/0xc30 net/ipv4/devinet.c:586 inet_rtm_newaddr+0x565/0xae0 net/ipv4/devinet.c:997 rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6675 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2541 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] __sys_sendto+0x488/0x4f0 net/socket.c:2195 __do_sys_sendto net/socket.c:2202 [inline] __se_sys_sendto net/socket.c:2198 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2198 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83