VirtualBox GUI "Aborts" VMs without GPU

[mustafacan]

Steps to reproduce:

1. Create a VM with any configuration.
2. Remove VM's GPU with this command "VBoxManage modifyvm VM --graphicscontroller none"
3. Start the VM with this command "VBoxManage.exe startvm VM --type headless"

At this point the VM will work without problems. You can connect to it with Serial or SSH to start working on it.

However, if you start the VirtualBox GUI at this point you'll receive an Application Error.

The instruction at 0x71105837 referenced memory at 0x00000010. The memory could not be read.

Click on OK to terminate the program

Then, GUI will Power off the VM instantly and show "Aborted" as VM's status.

(Note: I flagged this as critical, since powering off a VM without shutting down the Guest OS can result corruption of Guest OS.)

[Frank Mehnert]

Fixed in VBox 5.0.26. Fix will also be available in the next 5.1.x maintenance release.