Windows Driver Kit: Driver Development Tools
Bug Check 0x4E: PFN_LIST_CORRUPT
The PFN_LIST_CORRUPT bug check has a value of 0x0000004E. This indicates that the page frame number (PFN) list is corrupted.
Parameters
The following parameters are displayed on the blue screen. Parameter 1 indicates the type of violation. The meaning of the other parameters depends on the value of Parameter 1.
| Parameter 1 | Parameter 2 | Parameter 3 | Parameter 4 | Cause of Error |
|---|
| 0x01 | The ListHead value that was corrupted | The number of pages available | 0 | The list head was corrupt. |
| 0x02 | The entry in the list that is being removed | The highest physical page number | The reference count of the entry being removed | A list entry was corrupt. |
| 0x07 | The page frame number | The current share count | 0 | A driver has unlocked a certain page more times than it locked it. |
| 0x8F | New page number | Old page number | 0 | The free or zeroed page listhead is corrupt. |
| 0x99 | Page frame number | Current page state | 0 | A page table entry (PTE) or PFN is corrupt. |
| 0x9A | Page frame number | Current page state | The reference count of the entry that is being removed | A driver attempted to free a page that is still locked for IO. |
Cause
This error is typically caused by a driver passing a bad memory descriptor list. For example, the driver might have called MmUnlockPages twice with the same list.
If a kernel debugger is available, examine the stack trace.