unregister_netdevice: waiting for syz_tun to become free. Usage count = 10
ref_tracker: syz_tun@ffff888075db4620 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline]
     netdev_hold include/linux/netdevice.h:4076 [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:1612 [inline]
     __mkroute_output net/ipv4/route.c:2573 [inline]
     ip_route_output_key_hash_rcu+0x13cc/0x2390 net/ipv4/route.c:2795
     ip_route_output_key_hash+0x193/0x2b0 net/ipv4/route.c:2624
     __ip_route_output_key include/net/route.h:140 [inline]
     ip_route_output_flow+0x29/0x140 net/ipv4/route.c:2852
     ip_route_output_key include/net/route.h:150 [inline]
     geneve_link_config+0x1a7/0x640 drivers/net/geneve.c:1585
     geneve_newlink+0x139/0x1b0 drivers/net/geneve.c:1638
     rtnl_newlink_create net/core/rtnetlink.c:3510 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3730 [inline]
     rtnl_newlink+0x1591/0x20a0 net/core/rtnetlink.c:3743
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:745
     __sys_sendto+0x3a4/0x4f0 net/socket.c:2204
     __do_sys_sendto net/socket.c:2216 [inline]
     __se_sys_sendto net/socket.c:2212 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2212
     do_syscall_x64 arch/x86/entry/common.c:52 [inline]
     do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83

ref_tracker: syz_tun@ffff888075db4620 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4059 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:914
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3543
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3809
     ip6_route_add+0x28/0x160 net/ipv6/route.c:3853
     addrconf_prefix_route net/ipv6/addrconf.c:2486 [inline]
     addrconf_add_linklocal+0x61a/0xa30 net/ipv6/addrconf.c:3317
     addrconf_addr_gen+0x510/0xbb0
     addrconf_dev_config net/ipv6/addrconf.c:3492 [inline]
     addrconf_init_auto_addrs+0x96a/0xeb0 net/ipv6/addrconf.c:3570
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3743
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8915
     do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2900
     __rtnl_newlink net/core/rtnetlink.c:3696 [inline]
     rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3743
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357

ref_tracker: syz_tun@ffff888075db4620 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4059 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:914
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3543
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3809
     addrconf_f6i_alloc+0x3c2/0x7f0 net/ipv6/route.c:4588
     ipv6_add_addr+0x5b6/0x1090 net/ipv6/addrconf.c:1120
     addrconf_add_linklocal+0x36c/0xa30 net/ipv6/addrconf.c:3315
     addrconf_addr_gen+0x510/0xbb0
     addrconf_dev_config net/ipv6/addrconf.c:3492 [inline]
     addrconf_init_auto_addrs+0x96a/0xeb0 net/ipv6/addrconf.c:3570
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3743
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8915
     do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2900
     __rtnl_newlink net/core/rtnetlink.c:3696 [inline]
     rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3743
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550

ref_tracker: syz_tun@ffff888075db4620 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4059 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:914
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3543
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3809
     ip6_route_add+0x28/0x160 net/ipv6/route.c:3853
     addrconf_add_mroute net/ipv6/addrconf.c:2550 [inline]
     addrconf_add_dev+0x35b/0x540 net/ipv6/addrconf.c:2568
     addrconf_dev_config net/ipv6/addrconf.c:3482 [inline]
     addrconf_init_auto_addrs+0x85f/0xeb0 net/ipv6/addrconf.c:3570
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3743
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8915
     do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2900
     __rtnl_newlink net/core/rtnetlink.c:3696 [inline]
     rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3743
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901

ref_tracker: syz_tun@ffff888075db4620 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4059 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:914
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3543
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3809
     ip6_route_add+0x28/0x160 net/ipv6/route.c:3853
     addrconf_prefix_route net/ipv6/addrconf.c:2486 [inline]
     fixup_permanent_addr net/ipv6/addrconf.c:3601 [inline]
     addrconf_permanent_addr+0x7c7/0xc50 net/ipv6/addrconf.c:3625
     addrconf_notify+0x9f5/0x1020 net/ipv6/addrconf.c:3697
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8915
     do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2900
     __rtnl_newlink net/core/rtnetlink.c:3696 [inline]
     rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3743
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:745

ref_tracker: syz_tun@ffff888075db4620 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline]
     netdev_hold include/linux/netdevice.h:4076 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1239 [inline]
     fib_check_nh+0xd17/0x1bd0 net/ipv4/fib_semantics.c:1259
     fib_create_info+0x1467/0x24e0 net/ipv4/fib_semantics.c:1557
     fib_table_insert+0x1f6/0x1f30 net/ipv4/fib_trie.c:1237
     fib_magic+0x3d8/0x620 net/ipv4/fib_frontend.c:1104
     fib_add_ifaddr+0x40c/0x5e0 net/ipv4/fib_frontend.c:1148
     fib_netdev_event+0x375/0x490 net/ipv4/fib_frontend.c:1486
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8915
     do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2900
     __rtnl_newlink net/core/rtnetlink.c:3696 [inline]
     rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3743
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:745

ref_tracker: syz_tun@ffff888075db4620 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline]
     netdev_hold include/linux/netdevice.h:4076 [inline]
     fib_check_nh_nongw net/ipv4/fib_semantics.c:1239 [inline]
     fib_check_nh+0xd17/0x1bd0 net/ipv4/fib_semantics.c:1259
     fib_create_info+0x1467/0x24e0 net/ipv4/fib_semantics.c:1557
     fib_table_insert+0x1f6/0x1f30 net/ipv4/fib_trie.c:1237
     fib_magic+0x3d8/0x620 net/ipv4/fib_frontend.c:1104
     fib_add_ifaddr+0x398/0x5e0 net/ipv4/fib_frontend.c:1141
     fib_netdev_event+0x375/0x490 net/ipv4/fib_frontend.c:1486
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8915
     do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2900
     __rtnl_newlink net/core/rtnetlink.c:3696 [inline]
     rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3743
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:745

ref_tracker: syz_tun@ffff888075db4620 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4047 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4059 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:914
     fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3543
     ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3809
     addrconf_f6i_alloc+0x3c2/0x7f0 net/ipv6/route.c:4588
     ipv6_add_addr+0x5b6/0x1090 net/ipv6/addrconf.c:1120
     inet6_addr_add+0x563/0xb00 net/ipv6/addrconf.c:3060
     inet6_rtm_newaddr+0x8a3/0xc90 net/ipv6/addrconf.c:5048
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:745
     __sys_sendto+0x3a4/0x4f0 net/socket.c:2204
     __do_sys_sendto net/socket.c:2216 [inline]
     __se_sys_sendto net/socket.c:2212 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2212
     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@ffff888075db4620 has 1/9 users at
     fib_create_info+0x1f7a/0x24e0 net/ipv4/fib_semantics.c:1551
     fib_table_insert+0x1f6/0x1f30 net/ipv4/fib_trie.c:1237
     fib_magic+0x3d8/0x620 net/ipv4/fib_frontend.c:1104
     fib_add_ifaddr+0x14c/0x5e0 net/ipv4/fib_frontend.c:1126
     fib_inetaddr_event+0x167/0x1f0 net/ipv4/fib_frontend.c:1440
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     blocking_notifier_call_chain+0x69/0x90 kernel/notifier.c:388
     __inet_insert_ifa+0x9d4/0xc30 net/ipv4/devinet.c:561
     inet_rtm_newaddr+0xbda/0x1af0 net/ipv4/devinet.c:986
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357
     netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901
     sock_sendmsg_nosec net/socket.c:730 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:745
     __sys_sendto+0x3a4/0x4f0 net/socket.c:2204
     __do_sys_sendto net/socket.c:2216 [inline]
     __se_sys_sendto net/socket.c:2212 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2212