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Bug Check 0xC8: IRQL_UNEXPECTED_VALUE

The IRQL_UNEXPECTED_VALUE bug check has a value of 0x000000C8. This indicates that the processor's IRQL is not what it should be at this time.

Important Info If You Have Received a STOP Code

bsod

If you received a blue screen error, or stop code, the computer has shut down abruptly to protect itself from data loss.

For information about how to recover from this error, see Resolving Blue Screen errors in Windows.

IRQL_UNEXPECTED_VALUE Parameters

The following parameters are displayed on the blue screen.

ParameterDescription

1

The value of the following bit computation:

(Current IRQL << 16) | (Expected IRQL << 8) | UniqueValue

2

Zero, or APC->KernelRoutine

3

Zero, or APC

4

Zero, or APC->NormalRoutine

 

You can determine "UniqueValue" by computing (Parameter 1 AND 0xFF). If "UniqueValue" is either zero or one, Parameter 2, Parameter 3, and Parameter 4 will equal the indicated APC pointers. Otherwise, these parameters will equal zero.

Cause

This error is usually caused by a device driver or another lower-level program that changed the IRQL for some period and did not restore the original IRQL at the end of that period. For example, the routine may have acquired a spin lock and failed to release it.

 

 

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