The Pentium F00F Bug

By Robert R. Collins

Dr. Dobb's Journal May 1998

Sequence  Address   Data      Mnemonic                        Timestamp
-------------------------------------------------------------------------
  429135  00060FF8  0008049A    ( LOCKED MEM READ )              330 ns
         00060FFC  00008E00    ( LOCKED MEM READ )
  429136  0001E8B8  BFF0FFFF    ( LOCKED MEM READ )              170 ns
          0001E8BC  00009B01    ( LOCKED MEM READ )
  429137  0001EE9C  00000008    ( LOCKED MEM WRITE )             140 ns
  429138  0001EE98  000003F2    ( MEM WRITE )                     50 ns

Example 3: F00F bug on page write-through.

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