func (m *UsernsManager) allocateOne(pod types.UID) (firstID uint32, length uint32, err error) {
	firstZero, found, err := m.used.AllocateNext()
	if err != nil {
		return 0, 0, err
	}
	if !found {
		return 0, 0, fmt.Errorf("could not find an empty slot to allocate a user namespace")
	}

	klog.V(5).InfoS("new pod user namespace allocation", "podUID", pod)

	firstID = uint32((firstZero + m.off) * userNsLength)

    Arg<Variadic<TF_Tensor>, [{A list of tensors to print out when op is evaluated.}]>:$data,

    DefaultValuedOptionalAttr<StrAttr, "\"\"">:$message,
    DefaultValuedOptionalAttr<I64Attr, "-1">:$first_n,
    DefaultValuedOptionalAttr<I64Attr, "3">:$summarize
  );

  let results = (outs
    Res<TF_Tensor, [{The unmodified `input` tensor}]>:$output
  );