| Debugging Tools for Windows |
The APC_INDEX_MISMATCH bug check has a value of 0x00000001. This indicates that there has been a mismatch in the APC state index.
The following parameters are displayed on the blue screen.
| Parameter | Description |
|---|---|
| 1 | The address of the system function (system call) |
| 2 | The value of the following bit computation: Thread->ApcStateIndex << 8 | Previous ApcStateIndex |
| 3 | The value of Thread->KernelApcDisable |
| 4 | The value of the previous KernelApcDisable |
The most common cause of this bug check is when a file system has a mismatched sequence of KeEnterCriticalRegion calls and KeLeaveCriticalRegion calls.
This is a kernel internal error which can occur only on a checked build. This error occurs on exit from a system call.