While trying to determine whether or not a particular processor has completed the task for which it was awakened, PDC was unable to access the CPU's Forward Progress State (i.e. PST state) for the target processor. A processor should always be able to access this data in PDH memory for any processor on its own cell and for any processor on a cell that is alive in the partition. Therefore, PDC is either going to halt the cell or reset the partition because of this problem. The data field contains the PDC error return status from CpuFpSet().