1. A method for testing loss of lock step among a plurality of processors operable in lock step and executing identical code sequences, the identical code sequences comprising identical code subsequences, the method comprising: generating at least a one-bit difference between at least two of the processors, comprising: seeding a difference between the at least two processors, wherein the difference comprises a processor-unique value, and executing the identical code sequences by the at least two processors, comprising: in each of the at least two processors, reading the processor-unique value, and conditionally executing one or more of the identical code subsequences, wherein a seeded difference is propagated through the at least two processors; reading outputs of the at least two processors; and when two or more outputs differ, signaling a loss of lock step.