An IPR message indicates that the program is about to read from memory that is not a valid, addressable memory region.
For example, this message can occur when you access an address that:
§ Does not exist in the address space
§ Is within the red zone of a previously-freed block of memory
§ Is within the first 64K of the address space
§ Is within memory Purify owns
§ Is uncommitted virtual memory
The addressable regions include:
§ Program code and data sections
§ The stack for each valid thread
§ Any heaps
§ Any VirtualAlloc or MapViewOfFile space
§ The thread local data storage
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