Int 08  - CPU-generated (80286+) - Double Exception Detected               [C]

Desc:  called when multiple exceptions occur on one instruction, or an
     exception occurs in an exception handler

Notes: called in protected mode if an interrupt above the defined limit of
     the interrupt vector table occurs
   return address points at beginning of instruction with errors or the
     beginning of the instruction which was about to execute when the
     external interrupt caused the exception
   if an exception occurs in the double fault handler, the CPU goes into
     SHUTDOWN mode (which circuitry in the PC/AT converts to a reset);
     this "triple fault" is a faster way of returning to real mode on
     many 80286 machines than the standard keyboard controller reset