| Debugging Tools for Windows |
The MUTEX_ALREADY_OWNED bug check has a value of 0x000000BF. This indicates that a thread attempted to acquire ownership of a mutex it already owned.
The following parameters are displayed on the blue screen.
| Parameter | Description |
|---|---|
| 1 | The address of the mutex |
| 2 | The thread that caused the error |
| 3 | 0 |
| 4 | Reserved |