PFN_LIST_CORRUPT

Source
The PFN_LIST_CORRUPT bug check has a value of 0x0000004E. This indicates that the page frame number (PFN) list is corrupted.

Important Info If You Have Received a STOP Code

If you received a blue screen error, or stop code, the computer has shut down abruptly to protect itself from data loss. A hardware device, its driver, or related software might have caused this error. If your copy of Windows came with your computer, call the manufacturer of your computer. If you purchased Windows separately from your computer, Microsoft provides support. To find contact info for Microsoft or your computer manufacturer, Contact Support.
If you have experience with computers and want to try to recover from this error, follow the steps provided in the Microsoft article Resolving STOP (Blue Screen) Errors in Windows.
These actions might prevent an error like this from happening again:

1. Download and install updates and device drivers for your computer from Windows Update.
2. Scan your computer for computer viruses.
3. Check your hard disk for errors.

PFN_LIST_CORRUPT 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 corrupted.
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 corrupted.
0x07	The page frame number	The current share count	0	A driver has unlocked a certain page more times than it locked it.
0x8D	The page frame number whose state is inconsistent	0	0	The page-free list is corrupted. This error code most likely indicates a hardware issue.
0x8F	New page number	Old page number	0	The free or zeroed page listhead is corrupted.
0x99	Page frame number	Current page state	0	A page table entry (PTE) or PFN is corrupted.
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.