[Solved] Can't run Windows VMs after upgrade to VB6

[BlanderSQL]

My Linux VMs run fine, but my Windows10 and Windows Server 2019 both error with:

Duplicate config values '/CPUM/CMPXCHG16B' and '/CPUM/IsaExts/CMPXCHG16B' - please remove the former! (VERR_DUPLICATE).

Result Code: E_FAIL (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}

Thanks

[socratis]

You must have either done something from the command line that you shouldn't, or you got this VM from somewhere else. Both of these are details that you should have told us about...

I'd like to see the "recipe" of the VM, the ".vbox" file:

1. Right-click on the VM in the VirtualBox Manager, select "Show in Explorer".
2. ZIP the selected ".vbox" file and attach it in your response.

[BlanderSQL]

The VM was created in version 5.x on the same host- a Windows 7 64-bit machine. I have not done anything on a command line to the VM, nor anything Virtualbox related ever.

Thanks

[BillG]

Did you try doing what the message told you to do - remove the duplicate entry?

[BlanderSQL]

Did you try doing what the message told you to do - remove the duplicate entry?

Thanks, that worked. I had to manually comment this line out in VirtualBox.xml
<ExtraDataItem name="VBoxInternal/CPUM/CMPXCHG16B" value="1"/>

not sure how or when that was added, i have never edited that file before, nor used the command line tool.

[socratis]

I thought you made a mistake when you said "VirtualBox.xml", but apparently not, it was indeed there and not in the "Win2019.vbox". It was a global setting!

not sure how or when that was added, i have never edited that file before, nor used the command line tool.

Yet you knew which file to edit, and when to edit it (with all VBox processes closed)? Impressive...

[BlanderSQL]

Yep, I had to google for where it was located since nothing in the .vbox file had the CPUM setting.
Google pointed me to: https://www.virtualbox.org/pipermail/vb ... 14161.html
I went to %USERPROFILE% and in the .VirtualBox folder and looked for files not with Log in the name, there's a bunch.
Then in the config file the header notes specifically says to not make changes with anything virtualbox running since "your changes will be overwritten later, without taking effect."

[socratis]

As I said... impressive! Hats off to you!
Marking as [Solved].

[burkecabaniss]

I have exact same problem but cannot find file to "just do it". I have naive simple W10 on Linux host that worked before upgrade. I do find VirtualBox.xml files. I find no files containing value "CHG16B" anywhere in my file system except in sources (/opt/VirtualBox/src). I believe I have read all above. Please advise.

[andyp73]

It will either be in the VirtualBox.xml file or in the .vbox file for the Windows 10 guest. You are going to have to search around as we aren't sat in front of your computer. 10.1. Where Oracle VM VirtualBox Stores its Files should tell you where to go looking.

-Andy.