Unexpected kernel mode trap

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UNEXPECTED_KERNEL_MODE_TRAP is a category of blue screen error for Microsoft Windows with a reason code of 0x7F.

Common Causes[edit]

A problem that typically originates from the computer's memory system.[1]


  1. Processor exception code
  2. 0 (zero)
  3. 0 (zero)
  4. 0 (zero)

Parameter 1[edit]

  • 0x00000000 means "Divide by Zero Error". This error can be caused by memory corruption, hardware problems, or software failures.
  • 0x00000004 means "Overflow", occurring when the processor calls an interrupt handler while the Overflow flag is set.
  • 0x00000005, or Bounds Check Fault
  • 0x00000006, or Invalid Opcode
  • 0x00000008, or Double Fault
  • 0x00000001 —A system-debugger call.
  • 0x00000003 —A debugger breakpoint.
  • 0x00000007— A hardware coprocessor instruction with no coprocessor present.
  • 0x0000000A —A corrupted Task State Segment.
  • 0x0000000B —An access to a memory segment that was not present.
  • 0x0000000C —An access to memory beyond the limits of a stack.
  • 0x0000000D —An exception not covered by some other exception; a protection fault that pertains to access violations for applications.


  1. ^ Microsoft TechNet, "Demystifying the 'Blue Screen of Death". http://technet.microsoft.com/en-us/library/cc750081.aspx#XSLTsection124121120120 Retrieved August 15, 2011.