CMPXCHG16B

[LindaCarter]

Just upgraded from v5.32 to v6 here, but get this error on about half of the VM's I am trying to upgrade. I didnt see where a user can change this, please help! Occurs when I try to launch the VM's. Thank you.

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}

[LindaCarter]

I also tried removing the line

<ExtraDataItem name="VBoxInternal/CPUM/CMPXCHG16B" value="1"/>

From the .vbox file of a vm, but each time I run it places the line back in too.

[Socratis]

1. It's usually better and faster, if issues get first addressed in the ​VirtualBox forums, a lot more eyes there. More than 95% of the issues are resolved in the forums, which keeps the developers focusing on the bug fixes and enhancements, and there is no need for another ticket to keep track of. For example, yours is most probably not a bug and someone from the developers has to deal with it and close it as "Invalid".

2. If you have any VirtualBox related process running it will not work, as you noticed. What you need to do is get out of the mindset of fixing it manually. Did you notice the following in the beginning of the .VBOX file?

   <!--
   ** DO NOT EDIT THIS FILE.
   ** If you make changes to this file while any VirtualBox related application
   ** is running, your changes will be overwritten later, without taking effect.
   ** Use VBoxManage or the VirtualBox Manager GUI to make changes.
   -->
   

   Do it officially:

   VBoxManage setextradata "Win8 EMD - Dreamweaver Xampp HPT" "VBoxInternal/CPUM/CMPXCHG16B"
   

Oh BTW, you had to put this value manually in the .VBOX file, it didn't just ... grow! ;)

[LindaCarter]

Thank you, command line worked.

BTW - no I never put the value in the .vbox file! Can't explain how it got there or even what it did.

[Socratis]

Replying to LindaCarter:

Thank you, command line worked.

Good to know. I guess the ticket can be closed as [Invalid] or [WorksForMe].

BTW - no I never put the value in the .vbox file! Can't explain how it got there or even what it did.

Well, somebody/something did, things don't get added by divine intervention... :)
All is well that ends well.