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Page Fault in Nonpaged Area, ClassPNP.SYS BSOD, Windows 10

This is a discussion on Page Fault in Nonpaged Area, ClassPNP.SYS BSOD, Windows 10 within the BSOD, App Crashes And Hangs forums, part of the Tech Support Forum category. I've been noticing that I've been playing Overwatch recently and my game is crashing, and I got this BSOD a

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Old 06-20-2016, 08:16 PM   #1
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Join Date: Jun 2016
Posts: 1
OS: Windows 10

I've been noticing that I've been playing Overwatch recently and my game is crashing, and I got this BSOD a couple of times. I've recently installed some new memory and have noticed that anywhere from 4-6GB of it is always in use by something at all times, even when idle. I'm not sure what's causing this.

ท OS - Windows 10, 8.1, 8, 7 or Vista? Windows 10
ท x86 (32-bit) or x64 ? x64
ท What was the original installed OS on the system? Windows 10
ท Is the OS an OEM version (came pre-installed on system) or full retail version (YOU purchased it from retailer)? Full retail
ท Approximate age of system (hardware): Frankenstein computer, some parts 6+ years old, some parts new
ท Approximate age of OS installation (if you know): Brand new on SSD
ท Have you re-installed the OS? No

Operating System
Windows 10 Pro 64-bit
Intel Core 2 Quad Q9650 @ 3.00GHz 46 ฐC
Yorkfield 45nm Technology
8.00GB Dual-Channel DDR3 @ 666MHz (9-8-8-20)
ASUSTeK Computer INC. P5KC (LGA775) 44 ฐC
LCD TV ([email protected])
3072MB ATI AMD Radeon R9 200 Series (Sapphire/PCPartner) 42 ฐC
931GB Western Digital WDC WD1001FALS-00Y6A0 (SATA) 47 ฐC
931GB Samsung SSD 850 EVO 1TB (SSD) 42 ฐC
14GB TOSHIBA TransMemory USB Device (USB)
Optical Drives
DTSOFT Virtual CdRom Device
Realtek High Definition Audio
Operating System
Windows 10 Pro 64-bit
Computer type: Desktop

Laptop or Desktop? Desktop, custom

On Tue 6/21/2016 1:34:58 AM GMT your computer crashed
crash dump file: C:\Windows\Minidump\062016-18890-01.dmp
This was probably caused by the following module: classpnp.sys (CLASSPNP!ClassReadWrite+0x4)
Bugcheck code: 0x50 (0xFFFFD0025449E425, 0x2, 0xFFFFF8011CD26EE4, 0x2)
file path: C:\Windows\system32\drivers\classpnp.sys
product: Microsoftฎ Windowsฎ Operating System
company: Microsoft Corporation
description: SCSI Class System Dll
Bug check description: This indicates that invalid system memory has been referenced.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in a standard Microsoft module. Your system configuration may be incorrect. Possibly this problem is caused by another driver on your system that cannot be identified at this time.
Attached Files
File Type: zip SysnativeFileCollectionApp.zip (2.19 MB, 103 views)
File Type: zip Perfmon.zip (156.6 KB, 58 views)
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Old 06-22-2016, 06:44 PM   #2
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Join Date: Sep 2007
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Posts: 34,338
OS: Windows 10, 8.1 + Windbg :)

Hi. . .

Neither of the 2 dumps listed classpnp.sys (listed in your thread title) as the probable cause. Where exactly did you see it?


One dump named the Microsoft Partition Management driver partmgr.sys as the probable cause; the other named ntkrnlmp.exe, which is the Windows kernel and was named merely as a default and definitely is not the cause. Same with partmgr.sys - named as a default.


One dump had a bugcheck = 0x50 - invalid memory referenced

For info, the 0x50 bugcheck = "PAGE_FAULT_IN_NONPAGED_AREA", included in your thread title.

The other dump's bugcheck = 0xc000021 - system process terminated unexpectedly

I usually see 0xc000021 bugchecks when there is a hard drive issue.

Run HDD diagnostics - SeaTools for DOS, LONG test - https://www.sysnative.com/forums/har...agnostics.html

Be sure to run it on all drives -- internal drives (the system files you provided shows drives c:, d: and g: -- but may span only 2 physical drives) + the one external drive.

The reports also show a 15 GB TOSHIBA TransMemory USB Device connected at the time the Sysnative app was run.

Also, since both dumps gave us default drivers, see if Driver Verifier flags any 3rd party drivers - https://www.techsupportforum.com/foru...ed-473665.html

Run Driver Verifier after all runs of SeaTools are completed.

Regards. . .



NOTE: I am recovering from major surgery (double hip replacement) and may not be able to promptly reply to your thread. Thank you for your patience and understanding.


Loading Dump File [C:\Users\PalmDesert\_jcgriff2_\dbug\__Kernel__\062016-18890-01.dmp]
Built by: 10586.420.amd64fre.th2_release_sec.160527-1834
Debug session time: Mon Jun 20 21:34:58.789 2016 (UTC - 4:00)
System Uptime: 1 days 6:43:22.503
Probably caused by : partmgr.sys ( partmgr!PartitionIo+1c6 )
PROCESS_NAME:  Overwatch.exe
Bugcheck code 00000050
Arguments ffffd002`5449e425 00000000`00000002 fffff801`1cd26ee4 00000000`00000002
BiosVersion = 1203   
BiosReleaseDate = 06/25/2008
SystemManufacturer = System manufacturer
SystemProductName = P5KC
MaxSpeed:     3000
CurrentSpeed: 3000
Loading Dump File [C:\Users\PalmDesert\_jcgriff2_\dbug\__Kernel__\061316-21562-01.dmp]
Built by: 10586.306.amd64fre.th2_release_sec.160422-1850
Debug session time: Mon Jun 13 17:01:12.110 2016 (UTC - 4:00)
System Uptime: 0 days 0:01:50.811
Probably caused by : ntkrnlmp.exe ( nt! ?? ::OKHAJAOM::`string'+74d )
PROCESS_NAME:  smss.exe
BUGCHECK_STR:  0xc000021a_SmpDestroyControlBlock_smss.exe_Terminated_c0000428
FAILURE_BUCKET_ID:  0xc000021a_SmpDestroyControlBlock_smss.exe_Terminated_c0000428_nt!_??_::OKHAJAOM::_string_
Bugcheck code C000021A
Arguments ffffc001`947b8260 ffffffff`c0000428 00000000`00000000 00000202`7d7f0000
BiosVersion = 1203   
BiosReleaseDate = 06/25/2008
SystemManufacturer = System manufacturer
SystemProductName = P5KC
MaxSpeed:     3000
CurrentSpeed: 3000
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