unregister_netdevice: waiting for veth1_to_bridge to become free. Usage count = 2
ref_tracker: netdev@ffff88811c3e0610 has 1/1 users at
     netdev_get_by_index+0x79/0xb0
     fib6_nh_init+0x1cd/0x1ff0
     ip6_route_info_create_nh+0x16a/0xab0
     ip6_route_add+0x6e/0x1b0
     ipv6_route_ioctl+0x35c/0x480
     inet6_ioctl+0x219/0x280
     sock_do_ioctl+0xdc/0x300
     sock_ioctl+0x576/0x790
     __se_sys_ioctl+0xfc/0x170
     do_syscall_64+0xfa/0x3b0
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

