1. A logically partitioned data processing system, comprising: a plurality of operating systems, each assigned to a separate one of a plurality of logical partitions; a plurality of processors, each assigned to one of the plurality of logical partitions; and a hypervisor for creating and maintaining separation of the plurality of logical partitions, said hypervisor having a plurality of data structure areas; wherein a fatal data fetch error occurring in a data structure within the plurality of data structure areas results in the hypervisor rebooting only data processing system components associated with a logical partition within the plurality of logical partitions in which the data structure is located within the logically partitioned data processing system.