unregister_netdevice: waiting for syz_tun to become free. Usage count = 10
ref_tracker: syz_tun@ffff88807d504610 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4119 [inline]
     netdev_hold include/linux/netdevice.h:4148 [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:2571 [inline]
     ip_route_output_key_hash_rcu+0x13cc/0x2390 net/ipv4/route.c:2793
     ip_route_output_key_hash+0x193/0x2b0 net/ipv4/route.c:2622
     __ip_route_output_key include/net/route.h:141 [inline]
     ip_route_output_flow+0x29/0x140 net/ipv4/route.c:2850
     ip_route_output_key include/net/route.h:151 [inline]
     geneve_link_config+0x1a7/0x640 drivers/net/geneve.c:1585
     geneve_newlink+0x139/0x1b0 drivers/net/geneve.c:1638
     rtnl_newlink_create+0x2df/0xa30 net/core/rtnetlink.c:3703
     __rtnl_newlink net/core/rtnetlink.c:3789 [inline]
     rtnl_newlink+0xfa9/0x1550 net/core/rtnetlink.c:3887
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6799
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551
     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:729 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:744
     __sys_sendto+0x39b/0x4f0 net/socket.c:2216
     __do_sys_sendto net/socket.c:2228 [inline]
     __se_sys_sendto net/socket.c:2224 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2224

ref_tracker: syz_tun@ffff88807d504610 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4119 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4131 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:916
     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:3319
     addrconf_addr_gen+0x510/0xbb0
     addrconf_dev_config net/ipv6/addrconf.c:3494 [inline]
     addrconf_init_auto_addrs+0x96a/0xeb0 net/ipv6/addrconf.c:3572
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3745
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8981
     do_setlink+0xc90/0x4210 net/core/rtnetlink.c:3043
     rtnl_changelink net/core/rtnetlink.c:3646 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3767 [inline]
     rtnl_newlink+0xeec/0x1550 net/core/rtnetlink.c:3887
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6799
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551
     netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
     netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357

ref_tracker: syz_tun@ffff88807d504610 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4119 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4131 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:916
     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:3317
     addrconf_addr_gen+0x510/0xbb0
     addrconf_dev_config net/ipv6/addrconf.c:3494 [inline]
     addrconf_init_auto_addrs+0x96a/0xeb0 net/ipv6/addrconf.c:3572
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3745
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8981
     do_setlink+0xc90/0x4210 net/core/rtnetlink.c:3043
     rtnl_changelink net/core/rtnetlink.c:3646 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3767 [inline]
     rtnl_newlink+0xeec/0x1550 net/core/rtnetlink.c:3887
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6799
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551

ref_tracker: syz_tun@ffff88807d504610 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4119 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4131 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:916
     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:3484 [inline]
     addrconf_init_auto_addrs+0x85f/0xeb0 net/ipv6/addrconf.c:3572
     addrconf_notify+0xaff/0x1020 net/ipv6/addrconf.c:3745
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8981
     do_setlink+0xc90/0x4210 net/core/rtnetlink.c:3043
     rtnl_changelink net/core/rtnetlink.c:3646 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3767 [inline]
     rtnl_newlink+0xeec/0x1550 net/core/rtnetlink.c:3887
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6799
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551
     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@ffff88807d504610 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4119 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4131 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:916
     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:3603 [inline]
     addrconf_permanent_addr+0x7c7/0xc50 net/ipv6/addrconf.c:3627
     addrconf_notify+0x9f5/0x1020 net/ipv6/addrconf.c:3699
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8981
     do_setlink+0xc90/0x4210 net/core/rtnetlink.c:3043
     rtnl_changelink net/core/rtnetlink.c:3646 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3767 [inline]
     rtnl_newlink+0xeec/0x1550 net/core/rtnetlink.c:3887
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6799
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551
     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:729 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:744

ref_tracker: syz_tun@ffff88807d504610 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4119 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4131 [inline]
     netdev_get_by_index+0x7a/0xb0 net/core/dev.c:916
     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
     fixup_permanent_addr net/ipv6/addrconf.c:3588 [inline]
     addrconf_permanent_addr+0x2c8/0xc50 net/ipv6/addrconf.c:3627
     addrconf_notify+0x9f5/0x1020 net/ipv6/addrconf.c:3699
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8981
     do_setlink+0xc90/0x4210 net/core/rtnetlink.c:3043
     rtnl_changelink net/core/rtnetlink.c:3646 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3767 [inline]
     rtnl_newlink+0xeec/0x1550 net/core/rtnetlink.c:3887
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6799
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551
     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:729 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:744

ref_tracker: syz_tun@ffff88807d504610 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4119 [inline]
     netdev_hold include/linux/netdevice.h:4148 [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:1105
     fib_add_ifaddr+0x40c/0x5e0 net/ipv4/fib_frontend.c:1149
     fib_netdev_event+0x375/0x490 net/ipv4/fib_frontend.c:1487
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8981
     do_setlink+0xc90/0x4210 net/core/rtnetlink.c:3043
     rtnl_changelink net/core/rtnetlink.c:3646 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3767 [inline]
     rtnl_newlink+0xeec/0x1550 net/core/rtnetlink.c:3887
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6799
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551
     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:729 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:744

ref_tracker: syz_tun@ffff88807d504610 has 1/9 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4119 [inline]
     netdev_hold include/linux/netdevice.h:4148 [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:1105
     fib_add_ifaddr+0x398/0x5e0 net/ipv4/fib_frontend.c:1142
     fib_netdev_event+0x375/0x490 net/ipv4/fib_frontend.c:1487
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     __dev_notify_flags+0x207/0x400
     dev_change_flags+0xf0/0x1a0 net/core/dev.c:8981
     do_setlink+0xc90/0x4210 net/core/rtnetlink.c:3043
     rtnl_changelink net/core/rtnetlink.c:3646 [inline]
     __rtnl_newlink net/core/rtnetlink.c:3767 [inline]
     rtnl_newlink+0xeec/0x1550 net/core/rtnetlink.c:3887
     rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6799
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551
     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:729 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:744

ref_tracker: syz_tun@ffff88807d504610 has 1/9 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:1105
     fib_add_ifaddr+0x14c/0x5e0 net/ipv4/fib_frontend.c:1127
     fib_inetaddr_event+0x167/0x1f0 net/ipv4/fib_frontend.c:1441
     notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
     blocking_notifier_call_chain+0x69/0x90 kernel/notifier.c:388
     __inet_insert_ifa+0xa68/0xc90 net/ipv4/devinet.c:575
     inet_rtm_newaddr+0x121b/0x1bc0 net/ipv4/devinet.c:1011
     rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6790
     netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2551
     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:729 [inline]
     __sock_sendmsg+0x221/0x270 net/socket.c:744
     __sys_sendto+0x39b/0x4f0 net/socket.c:2216
     __do_sys_sendto net/socket.c:2228 [inline]
     __se_sys_sendto net/socket.c:2224 [inline]
     __x64_sys_sendto+0xde/0x100 net/socket.c:2224