1. A system comprising: a memory structure containing a memory region; a bus coupled to the memory structure; and a memory controller apparatus coupled to the bus, the memory controller apparatus including: a read monitor to detect that a read operation is directed to the memory region while the memory region is in a poisoned state, and a state manager to clear the poisoned state if volatile data stored in the memory region does not correspond to a known data pattern and maintain the memory region in the poisoned state if the volatile data stored in the memory region corresponds to the known data pattern.