Random BSODs win32k.sys 0x3b


Bought a new computer and installed Win7 64. I'm getting about one BSOD a week and it seems to be totally random when it happens. So far I have tested with memtest86, Furmark and chkdsk with no errors.

You can find 3 dump files here:


I have updated the Video drivers (to Beta, nothing newer), chipset drivers and installet SP1 to no effect.

Let me know if more information is needed.

Much appreciated!



All of the attached DMP files are of the SYSTEM_SERVICE_EXCEPTION (3b) bug check.

This indicates that an exception happened while executing a routine that transitions from non-privileged code to privileged code.

This error has been linked to excessive paged pool usage and may occur due to user-mode graphics drivers crossing over and passing bad data to the kernel code.

BugCheck 3B, {c0000005, fffff96000144283, fffff8800b1a0020, 0}

5: kd> ln fffff96000144283
(fffff960`001441e0)   win32k!HmgLockEx+0xa3   |  (fffff960`0014432c)   win32k!RGNOBJ::vSet

The exception occurred in win32k!HmgLockEx.


1. AsIO.sys is listed and loaded which is Asus PC Probe/AI Suite. Please uninstall any and all Asus software/bloatware ASAP.

2. Ensure you have the latest video card drivers. If you are already on the latest video card drivers, uninstall and install a version or a few versions behind the latest to ensure it's not a latest driver only issue. If you have already experimented with the latest video card driver and many previous versions, please give the beta driver for your card a try.

3. If you're still crashing after all of the above, please run Memtest for NO LESS than ~8 passes (several hours):


Download Memtest86+ here:


Which should I download?

You can either download the pre-compiled ISO that you would burn to a CD and then boot from the CD, or you can download the auto-installer for the USB key. What this will do is format your USB drive, make it a bootable device, and then install the necessary files. Both do the same job, it's just up to you which you choose, or which you have available (whether it's CD or USB).

Do note that some older generation motherboards do not support USB-based booting, therefore your only option is CD (or Floppy if you really wanted to).

How Memtest works:

Memtest86 writes a series of test patterns to most memory addresses, reads back the data written, and compares it for errors.

The default pass does 9 different tests, varying in access patterns and test data. A tenth test, bit fade, is selectable from the menu. It writes all memory with zeroes, then sleeps for 90 minutes before checking to see if bits have changed (perhaps because of refresh problems). This is repeated with all ones for a total time of 3 hours per pass.

Many chipsets can report RAM speeds and timings via SPD (Serial Presence Detect) or EPP (Enhanced Performance Profiles), and some even support changing the expected memory speed. If the expected memory speed is overclocked, Memtest86 can test that memory performance is error-free with these faster settings.

Some hardware is able to report the "PAT status" (PAT: enabled or PAT: disabled). This is a reference to Intel Performance acceleration technology; there may be BIOS settings which affect this aspect of memory timing.

This information, if available to the program, can be displayed via a menu option.

Any other questions, they can most likely be answered by reading this great guide here:




Debugger/Reverse Engineer.

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Question Info

Last updated March 14, 2018 Views 2,473 Applies to: