| Debugging Tools for Windows |
The IRQL_GT_ZERO_AT_SYSTEM_SERVICE bug check has a value of 0x0000004A. This indicates that a thread is returning to user mode from a system call when its IRQL is still above PASSIVE_LEVEL.
The following parameters are displayed on the blue screen.
| Parameter | Description |
|---|---|
| 1 | The address of the system function (system call routine) |
| 2 | The current IRQL |
| 3 | 0 |
| 4 | 0 |