fun fact: When you dereference an unmapped address on X86-64, there are three different ways the CPU can tell you that!
#PF: the classic
#GP: that address *CAN'T* even be mapped
#SS: like #GP but also your compiler happened to place the pointer in RBP
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(with a message that hedges a bit, saying "probably" if the address is non-canonical or "maybe" if it is canonical)
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