unregister_netdevice: waiting for syzkaller0 to become free. Usage count = 2
ref_tracker: netdev@000000009c686db7 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4499 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4511 [inline]
     netdev_get_by_index+0x50/0xa0 net/core/dev.c:1027
     fib6_nh_init+0x1cc/0x934 net/ipv6/route.c:3615
     ip6_route_info_create_nh+0x114/0x360 net/ipv6/route.c:3914
     addrconf_f6i_alloc+0x100/0x19c net/ipv6/route.c:4706
     ipv6_add_addr+0x130/0x668 net/ipv6/addrconf.c:1132
     addrconf_add_linklocal+0xa0/0x284 net/ipv6/addrconf.c:3334
     addrconf_addr_gen+0x118/0x134 net/ipv6/addrconf.c:3458
     addrconf_dev_config net/ipv6/addrconf.c:3517 [inline]
     addrconf_init_auto_addrs+0xb4/0x2c4 net/ipv6/addrconf.c:3595
     addrconf_notify+0x664/0x814 net/ipv6/addrconf.c:3775
     notifier_call_chain kernel/notifier.c:85 [inline]
     raw_notifier_call_chain+0x54/0x80 kernel/notifier.c:453
     call_netdevice_notifiers_info+0x58/0xa4 net/core/dev.c:2250
     call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
     call_netdevice_notifiers net/core/dev.c:2302 [inline]
     __dev_notify_flags+0x4c/0xe4 net/core/dev.c:9799
     netif_change_flags+0x54/0x6c net/core/dev.c:9828
     dev_change_flags+0x88/0xc4 net/core/dev_api.c:68
     devinet_ioctl+0x354/0x5fc net/ipv4/devinet.c:1199
     inet_ioctl+0x214/0x260 net/ipv4/af_inet.c:1009