<processor> A fatal failure in the execution of a machine
language instruction resulting from the processor detecting
an anomalous condition on its bus. Such conditions include
invalid address alignment (accessing a multi-byte number at an
odd address), accessing a physical address that does not
correspond to any device, or some other device-specific
hardware error. A bus error triggers a processor-level
exception which Unix translates into a "SIGBUS" signal
which, if not caught, will terminate the current process.
(2000-04-04)
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