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.