Error “Cannot unregister the machine” on Jenkins, ‘kitchen test’ command

Ok, it’s a hack… so don’t use it unless you need it, and on your own risk.
For some reason, although the Windows vagrant box is updated using Matt Wrock’s packer templates from here, and everything goes well, and also on the first manual kitchen test on the Jenkins server everything goes ok, when run from Jenkin’s pipeline mechanism, the box is not destroyed.
Three VirtualBox processes remain hanged in the system.
It’s not a clean solution, but having this error over and over again:

STDERR: There was an error while executing `VBoxManage`, a CLI used by Vagrant for controlling VirtualBox. The command and stderr is shown below.
Command: [“unregistervm”, “some GUID here”, “–delete”]
Stderr: VBoxManage.exe: error: Cannot unregister the machine ‘kitchen-your_cookbook-default-windows2012r2_default_some_numbers’ while it is locked
VBoxManage.exe: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component MachineWrap, interface IMachine, callee IUnknown

it’s really annoying, so until the final solution will reveal itself, this might also be a way:

$cookbook = ‘your_cookbook_name’
gwmi -Query “select * from win32_process where name = ‘virtualbox.exe'” | `
? { $_.CommandLine.Contains(“kitchen-$cookbook”)} | `
Select CommandLine, Handle | `
% { Get-Process -Id $_.Handle } | `
Stop-Process -Force -ErrorAction Continue

You’ll need to execute it from Groovy with the bat command, something like

bat “powershell -File \”../killVBoxes.ps1\” ${cookbookName}”

For the path of the PowerShell script you’ll need to provide the correct path.

Note: Be aware that when copy-pasting, the quotes and possibly other characters get messed up by WordPress, you’ll have to replace them.


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