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Windows 10 MUP.SYS BSOD with Catalina using Fusion 11.5.x Shared Drives

Running into a very frustrating issue using Shared Drives in Fusion 11.5.x.  

Consistently, when manipulating files, attributes, etc in WIN10 on a VMWare Fusion Share Drive, I get a BSOD with the mup.sys driver indicating SYSTEM SERVICE EXCEPTION.  

This issue can be easily reproduced.  

I have removed and reinstalled VMWare tools -- removed and recreated the drives and still the issue remains.  

My setup:

  • Model Name: MacBook Pro
  • Model Identifier: MacBookPro16,1
  • Processor Name: 8-Core Intel Core i9
  • Processor Speed: 2.3 GHz
  • Number of Processors: 1
  • Total Number of Cores: 8

 

  • System Version: macOS 10.15.7 (19H2)

 

  • VMWare Fusion 11.5.7

 

I did some digging into the issue and found no matching issues or resolutions.   

What I learned and helped to isolate the issue:  

Mup.sys is a file associated with the Windows Multiple Universal Naming Convention Provider process and is responsible for handling queries for remote file I/O operations.

When an application tries to access a shared resource using a UNC path, the request first goes to the I/O Manager, which forwards it to the Multiple UNC Provider (MUP). The MUP then queries the installed redirectors to determine which one can access the shared resource. It then passes the request to the redirector.

So I am not sure if the issue is Windows or Fusion.... 

Any help would be appreciated.

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Hi,

Hallock27 said:
"Consistently, when manipulating files, attributes, etc in WIN10 on a VMWare Fusion Share Drive, I get a BSOD with the mup.sys driver indicating SYSTEM SERVICE EXCEPTION.  

This issue can be easily reproduced. "

I'm not vmware, but if I would like to see if I can reproduce this, can you get me some more specific details?

- exact version of Windows used (type: winver from a command line and list the version, windows home/windows professional and language)
- "when manipulating files/attribute".. please provide steps and what to expect? Eg. change 10x hidden attribute and boom, or change 40x ...
- what kind of files? Does it matter? .ico/.txt/...
- how are you manipulating those files.. I take it that you are using Windows explorer, but are you going via the mapped drive or via "\\vmware-host\Shared Folders", are the files you manipulate in a subfolder? 1 level deep, multiple levels deep..
- what kind of antivirus/antimalware product are you using in your Windows 10?
- are you using an antivirus/antimalware product on your host?

Just some questions I have when I read your report...

Also one thing to try is to see if it still happens after you run Microsoft's System File Checker tool:
https://support.microsoft.com/en-us/help/929833/use-the-system-file-checker-tool-to-repair-missing-o...


--

Wil

| Author of Vimalin. The virtual machine Backup app for VMware Fusion, VMware Workstation and Player |
| More info at vimalin.com | Twitter @wilva
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Thanks for your response --- So to answer your questions....

1) exact version of Windows used (type: winver from a command line and list the version, windows home/windows professional and language)

  • Windows Enterprise 10 Version 1809 (OS Build 17763.1577)

2) "when manipulating files/attribute".. please provide steps and what to expect? Eg. change 10x hidden attribute and boom, or change 40x ...

  • Usually happens within the 1st 2-3 file copies, file renames or if I am editing a file for some period of time (it does var)

3) what kind of files? Does it matter? .ico/.txt/...

  • Nope - doesn't matter

4) how are you manipulating those files.. I take it that you are using Windows explorer, but are you going via the mapped drive or via "\\vmware-host\Shared Folders"

  • Usually a mapped drive, but could happen to either.  

4a) are the files you manipulate in a subfolder? 1 level deep, multiple levels deep..

  • usually multiple levels deep

5) what kind of antivirus/antimalware product are you using in your Windows 10?

  • Symantec
  • But could be other other management spyware (Tanium, CrowdStrike Falcon) -- Who knows??

6) are you using an antivirus/antimalware product on your host?

  • Yes

Also one thing to try is to see if it still happens after you run Microsoft's System File Checker tool:

  • Thanks - I have tried this before, but will try again.  

 

This all started happening when I moved my VM from my 2017 MB Pro to the 2019 MB Pro.  I let Fusion update the VM to be compatible with 11.5 Fusion on the new machine. Hate to do it, but may have to build a new VM and see if it happens again.   

Just can't figure out if it is an underlying VMware Fusion Issue or a Windows issue.    

Wish I had more.  

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Anyone else have any thoughts?

Appreciate it.  

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Hi,

I tested it here with more recent version of Windows 10, but don't see the problem. Don't really have the time to go install an old Win10 version from 2018. Never had the problem when I was still running that version either, nor do I recall others reporting the same.

One side note though is that I have customized my shared folder behavior on my main Win10 VMs with the following option:

isolation.tools.hgfs.notify.enable = "FALSE"

What this does is that it does no longer notify the shared folder to see changes made.
As a result you will have to refresh (press F5) in order to see changes made at host level.

FWIW, here's another post about troubleshooting shared folder issues:
https://communities.vmware.com/t5/VMware-Fusion-Discussions/Shared-Folders-and-Windows-10-November-U...

--
Wil

| Author of Vimalin. The virtual machine Backup app for VMware Fusion, VMware Workstation and Player |
| More info at vimalin.com | Twitter @wilva
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Just wanted to add to this thread that I am seeing this as well. Ran older Windows 10 on a MacBookPro with Fusion 11.x for 2 years and never had a problem. Updated Mac to 11 and Fusion 12.1 a couple weeks ago and now get the mup.sys BSOD multiple times a week.  When it happens, there was some update occurring with a shared folder I use to transfer files between my VM and my Mac.   I wish I could back out of the updates now, but that's not possible for me.

My VMWare:  Fusion Profession Version 12.1.0 (17195230)

My Windows: MS Windows 10 Enterprise, 10.0.18363 Build 18363

My Mac: MacBookPro15,1, macOS 11.0.1

Again, 2 years of operation and never a peep.  Used the shared drive constantly between MacOS and W10. Refresh everything and now W10 VM crashes at least once a day.  I now just use a folder under the vm C: for Windows saving, and then do periodic transfers to the shared drive (to limit the pain). 

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This has been happening to me for a while as well. On VMware Fusion 12.1 now, and Win10 (with most if not all the updates applied). Tried the system file checker and it did nothing. Sorry I can't offer anything more than a "me too," post but here it is 🙂 

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