Bug Check 0x9C: MACHINE_CHECK_EXCEPTION

The MACHINE_CHECK_EXCEPTION bug check has a value of 0x0000009C. This bug check indicates that a fatal machine check exception has occurred.

Important

This article is for programmers. If you're a customer who has received a blue screen error code while using your computer, see Troubleshoot blue screen errors.

MACHINE_CHECK_EXCEPTION Parameters

The four parameters that are listed in the message have different meanings, depending on the processor type.

If the processor is based on an older x86-based architecture and has the Machine Check Exception (MCE) feature but not the Machine Check Architecture (MCA) feature (for example, the Intel Pentium processor), the parameters have the following meaning.

Parameter	Description
1	The low 32 bits of P5_MC_TYPE Machine Service Report (MSR)
2	The address of the MCA_EXCEPTION structure
3	The high 32 bits of P5_MC_ADDR MSR
4	The low 32 bits of P5_MC_ADDR MSR

If the processor is based on a newer x86-based architecture and has the MCA feature and the MCE feature (for example, any Intel Processor of family 6 or higher, such as Pentium Pro, Pentium IV, or Xeon), or if the processor is an x64-based processor, the parameters have the following meaning.

Parameter	Description
1	The bank number
2	The address of the MCA_EXCEPTION structure
3	The high 32 bits of MCi_STATUS MSR for the MCA bank that had the error
4	The low 32 bits of MCi_STATUS MSR for the MCA bank that had the error

Remarks

This bug check occurs only in the following circumstances.

• WHEA is not fully initialized.
• All processors that rendezvous have no errors in their registers.

For other circumstances, this bug check has been replaced with bug Check 0x124: WHEA_UNCORRECTABLE_ERROR in Windows Vista and later operating systems.

For more information about Machine Check Architecture (MCA), see the Intel or AMD Web sites.