Why doesn't the OS crash if I dereference a null pointer?

Question

Dereferencing a null pointer results in undefined behavior. In practice it usually means that my program will crash. But why doesn\'t the OS crash? Because if my progra

Answer 1

First of all, UB means "anything can happen". In practice however modern OSes offer memory protection - when a program tries to dereference a null pointer that attempt triggers an interrupt inside the CPU which is caught and handled by the OS and the OS then stops the program and then continues running as if nothing bad happened.