unregister_netdevice: waiting for syz_tun to become free. Usage count = 11
ref_tracker: syz_tun@ffff88806c084608 has 2/10 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]
     netdev_hold include/linux/netdevice.h:4311 [inline]
     dst_init+0xee/0x490 net/core/dst.c:52
     dst_alloc+0x14f/0x190 net/core/dst.c:93
     rt_dst_alloc net/ipv4/route.c:1638 [inline]
     __mkroute_output net/ipv4/route.c:2632 [inline]
     ip_route_output_key_hash_rcu+0x1378/0x2290 net/ipv4/route.c:2854
     ip_route_output_key_hash+0x193/0x2b0 net/ipv4/route.c:2683
     __ip_route_output_key include/net/route.h:169 [inline]
     ip_route_connect include/net/route.h:345 [inline]
     __ip4_datagram_connect+0x8b8/0x1260 net/ipv4/datagram.c:49
     udp_connect+0x33/0x200 net/ipv4/udp.c:2147
     __sys_connect_file net/socket.c:2045 [inline]
     __sys_connect+0x288/0x2d0 net/socket.c:2064
     __do_sys_connect net/socket.c:2070 [inline]
     __se_sys_connect net/socket.c:2067 [inline]
     __x64_sys_connect+0x7a/0x90 net/socket.c:2067
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: syz_tun@ffff88806c084608 has 1/10 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4294 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:990
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3548
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3814
     ip6_route_add+0x28/0x160 net/ipv6/route.c:3858
     addrconf_prefix_route net/ipv6/addrconf.c:2485 [inline]
     addrconf_add_linklocal+0x61a/0xa30 net/ipv6/addrconf.c:3310
     addrconf_addr_gen+0x510/0xbb0
     addrconf_dev_config net/ipv6/addrconf.c:3485 [inline]
     addrconf_init_auto_addrs+0x96a/0xeb0 net/ipv6/addrconf.c:3563
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3736
     notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:9337
     do_setlink+0xcca/0x4300 net/core/rtnetlink.c:3118
     rtnl_changelink net/core/rtnetlink.c:3733 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3885 [inline]
     rtnl_newlink+0x1704/0x1d30 net/core/rtnetlink.c:4022
     rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6912
     netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
     netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348

ref_tracker: syz_tun@ffff88806c084608 has 1/10 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4294 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:990
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3548
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3814
     addrconf_f6i_alloc+0x3c2/0x7f0 net/ipv6/route.c:4593
     ipv6_add_addr+0x5b6/0x1090 net/ipv6/addrconf.c:1119
     addrconf_add_linklocal+0x36c/0xa30 net/ipv6/addrconf.c:3308
     addrconf_addr_gen+0x510/0xbb0
     addrconf_dev_config net/ipv6/addrconf.c:3485 [inline]
     addrconf_init_auto_addrs+0x96a/0xeb0 net/ipv6/addrconf.c:3563
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3736
     notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:9337
     do_setlink+0xcca/0x4300 net/core/rtnetlink.c:3118
     rtnl_changelink net/core/rtnetlink.c:3733 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3885 [inline]
     rtnl_newlink+0x1704/0x1d30 net/core/rtnetlink.c:4022
     rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6912
     netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543

ref_tracker: syz_tun@ffff88806c084608 has 1/10 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4294 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:990
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3548
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3814
     ip6_route_add+0x28/0x160 net/ipv6/route.c:3858
     addrconf_add_mroute net/ipv6/addrconf.c:2549 [inline]
     addrconf_add_dev+0x35b/0x540 net/ipv6/addrconf.c:2567
     addrconf_dev_config net/ipv6/addrconf.c:3475 [inline]
     addrconf_init_auto_addrs+0x85f/0xeb0 net/ipv6/addrconf.c:3563
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3736
     notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:9337
     do_setlink+0xcca/0x4300 net/core/rtnetlink.c:3118
     rtnl_changelink net/core/rtnetlink.c:3733 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3885 [inline]
     rtnl_newlink+0x1704/0x1d30 net/core/rtnetlink.c:4022
     rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6912
     netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
     netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348
     netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892

ref_tracker: syz_tun@ffff88806c084608 has 1/10 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4294 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:990
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3548
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3814
     ip6_route_add+0x28/0x160 net/ipv6/route.c:3858
     addrconf_prefix_route net/ipv6/addrconf.c:2485 [inline]
     fixup_permanent_addr net/ipv6/addrconf.c:3594 [inline]
     addrconf_permanent_addr+0x7c7/0xc50 net/ipv6/addrconf.c:3618
     addrconf_notify+0x9f5/0x1020 net/ipv6/addrconf.c:3690
     notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:9337
     do_setlink+0xcca/0x4300 net/core/rtnetlink.c:3118
     rtnl_changelink net/core/rtnetlink.c:3733 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3885 [inline]
     rtnl_newlink+0x1704/0x1d30 net/core/rtnetlink.c:4022
     rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6912
     netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
     netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348
     netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892
     sock_sendmsg_nosec net/socket.c:718 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:733

ref_tracker: syz_tun@ffff88806c084608 has 1/10 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]
     netdev_hold include/linux/netdevice.h:4311 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1217 [inline]
     fib_check_nh+0xd17/0x1bd0 net/ipv4/fib_semantics.c:1237
     fib_create_info+0x1573/0x25b0 net/ipv4/fib_semantics.c:1533
     fib_table_insert+0x1f6/0x1f20 net/ipv4/fib_trie.c:1231
     fib_magic+0x3d8/0x620 net/ipv4/fib_frontend.c:1112
     fib_add_ifaddr+0x40c/0x5e0 net/ipv4/fib_frontend.c:1156
     fib_netdev_event+0x375/0x490 net/ipv4/fib_frontend.c:1494
     notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:9337
     do_setlink+0xcca/0x4300 net/core/rtnetlink.c:3118
     rtnl_changelink net/core/rtnetlink.c:3733 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3885 [inline]
     rtnl_newlink+0x1704/0x1d30 net/core/rtnetlink.c:4022
     rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6912
     netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
     netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348
     netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892
     sock_sendmsg_nosec net/socket.c:718 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:733

ref_tracker: syz_tun@ffff88806c084608 has 1/10 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]
     netdev_hold include/linux/netdevice.h:4311 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1217 [inline]
     fib_check_nh+0xd17/0x1bd0 net/ipv4/fib_semantics.c:1237
     fib_create_info+0x1573/0x25b0 net/ipv4/fib_semantics.c:1533
     fib_table_insert+0x1f6/0x1f20 net/ipv4/fib_trie.c:1231
     fib_magic+0x3d8/0x620 net/ipv4/fib_frontend.c:1112
     fib_add_ifaddr+0x398/0x5e0 net/ipv4/fib_frontend.c:1149
     fib_netdev_event+0x375/0x490 net/ipv4/fib_frontend.c:1494
     notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:9337
     do_setlink+0xcca/0x4300 net/core/rtnetlink.c:3118
     rtnl_changelink net/core/rtnetlink.c:3733 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3885 [inline]
     rtnl_newlink+0x1704/0x1d30 net/core/rtnetlink.c:4022
     rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6912
     netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
     netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348
     netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892
     sock_sendmsg_nosec net/socket.c:718 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:733

ref_tracker: syz_tun@ffff88806c084608 has 1/10 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4282 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4294 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:990
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3548
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3814
     addrconf_f6i_alloc+0x3c2/0x7f0 net/ipv6/route.c:4593
     ipv6_add_addr+0x5b6/0x1090 net/ipv6/addrconf.c:1119
     inet6_addr_add+0x3ae/0xe30 net/ipv6/addrconf.c:3047
     inet6_rtm_newaddr+0xa89/0xf10 net/ipv6/addrconf.c:5054
     rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6912
     netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
     netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348
     netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892
     sock_sendmsg_nosec net/socket.c:718 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:733
     __sys_sendto+0x363/0x4c0 net/socket.c:2187
     __do_sys_sendto net/socket.c:2194 [inline]
     __se_sys_sendto net/socket.c:2190 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2190
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

ref_tracker: syz_tun@ffff88806c084608 has 1/10 users at
     fib_create_info+0x17c5/0x25b0 net/ipv4/fib_semantics.c:1527
     fib_table_insert+0x1f6/0x1f20 net/ipv4/fib_trie.c:1231
     fib_magic+0x3d8/0x620 net/ipv4/fib_frontend.c:1112
     fib_add_ifaddr+0x14c/0x5e0 net/ipv4/fib_frontend.c:1134
     fib_inetaddr_event+0x167/0x1f0 net/ipv4/fib_frontend.c:1448
     notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
     blocking_notifier_call_chain+0x69/0x90 kernel/notifier.c:380
     __inet_insert_ifa+0xa68/0xc90 net/ipv4/devinet.c:575
     inet_rtm_newaddr+0x1220/0x1bc0 net/ipv4/devinet.c:1010
     rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6912
     netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2543
     netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1348
     netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892
     sock_sendmsg_nosec net/socket.c:718 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:733
     __sys_sendto+0x363/0x4c0 net/socket.c:2187
     __do_sys_sendto net/socket.c:2194 [inline]
     __se_sys_sendto net/socket.c:2190 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2190