| Debugging Tools for Windows |
The QUOTA_UNDERFLOW bug check has a value of 0x00000021. This indicates that quota charges have been mishandled by returning more quota to a particular block than was previously charged.
The following parameters are displayed on the blue screen.
| Parameter | Description |
|---|---|
| 1 | The process that was initially charged, if available. |
| 2 | The quota type. For the list of all possible quota type values, see the header file Ps.h in the Windows Driver Kit (WDK). |
| 3 | The initial charged amount of quota to return. |
| 4 | The remaining amount of quota that was not returned. |