AMD Provides Fix for AMD64 Processors’ Erratum@ 2004/06/25
The erratum that was recently discovered in AMD64 processors may lead to incorrect results in certain situations when a REP MOVS instruction is executed. An incorrect address size, data size or source operand segment may be used or a succeeding instruction may be skipped. This may occur only under certain conditions and may lead to production of incorrect results or system’s freeze, AMD said.
It is not clear whether any real systems have been affected by the erratum after the AMD Opteron processor has been in the market for more than a year.