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Crash everynight caused by mwac.sys driver

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My PC is crashing once a night and Blue Screen iewer is showing MWAC.sys as driver causing it. Running Window 10 Pro and Malwarebytes Pro all up to date.

122119-11734-01.dmp    12/21/2019 6:55:48 AM    DRIVER_IRQL_NOT_LESS_OR_EQUAL    0x000000d1    00000000`00000008    00000000`00000002    00000000`00000000    fffff801`461c2cc3    mwac.sys    mwac.sys+2cc3                    x64    ntoskrnl.exe+1c14e0                    C:\WINDOWS\Minidump\122119-11734-01.dmp    8    15    18362    1,347,336    12/21/2019 6:56:28 AM    

Showing a hardware driver, Been having problems with my mobo LAN driver last 2 weeks. It is a MSI
Model    Z270 GAMING M5 (MS-7A78) (U3E1). I already uninstalled and reinstalled Killer drivers. If any more dump info is needed for any suggestions please let me know. Thank You

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Hello @Scott_M and @Jackietools:

Please locate the Windows dump (.dmp) file that resulted from the reported BSoD.  That location is likely within the Windows sub-directory at:


The .dmp file is likely much too large to attach to a forum topic reply.  Instead, please upload to the free file hosting WeTransfer web site.  Once successfully uploaded to WeTransfer, please reply to this topic with the storage access' unique URL.  When received, that information will be forwarded to the appropriate Malwarebytes staffer/developer team for a thorough analysis.

Note: If the above filesize exceeds 2 GB, you will need to zip (compress) the .dmp file into a smaller archive before uploading.

Thank you for your patience and understanding.

cc: @nikhils

Edited by 1PW
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Hello @Jackietools

Our developers have identified the cause of the BSOD and we are working to get a fix in as soon as possible.

For now I would recommend keeping the Web Protection off .

Another option is to uninstall MB 4.0.4 and revert back to the older 3.8.3 build. 

I will give you a heads up when we have a build with the fix available.

Thank you.

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3 hours ago, Jackietools said:

Prompting me to update. Not sure if you applied fix to this latest version. Thanks

Do not think the fix is out yet. You can stop the notifications to update see the following 2 links.

The current KB articles will help you to set version 3.x from updating to 4.x for now

Constant upgrade notifications in Malwarebytes for Windows v3

Turn off upgrade notifications in Malwarebytes for Windows v3


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On 1/13/2020 at 6:10 PM, nikhils said:

Hello @Jackietools

The fix has not yet been applied to the latest version which you can download.

We are planning to release the fix in an upcoming release soon.

Thank you.

This problem also affects me, causing constant random BSOD, and occasionally disabling my Ethernet connection. I installed version 3.8 per suggestion and disabled the update notifications. Please post a message here when the fix is applied to an update.

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