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===Non-present segment (x86)=== On [[x86]] there exists an older memory management mechanism known as [[X86 memory segmentation|segmentation]]. If the application loads a segment register with the selector of a non-present segment (which under POSIX-compliant OSes can only be done with [[assembly language]]), the exception is generated. Some OSes used that for swapping, but under Linux this generates SIGBUS.
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