Powering off Guest without Graphics Controller causes Unresponsive Behavior -> fixed in 6.0.8 and 5.2.30

[TurtAlgo]

I have set the following options on Virtual Machine(s):

---

Graphics Controller: None
Graphics Memory: 0 MB

---

Powering off a machine will cause VirtualBox 6.0.6 to behave erratically and unresponsively. Configuring the guest with 5MB Video Memory and a Graphics Controller will allow proper function.

VirtualBox starts the guest again, and reports a memory error, where I have to end the process to fix this issue. I attempted to power off a couple dozen Headless Virtual Machines at once and my Host hung from attempting to restart the Virtual Machines. They also opened up the interface.

I am also having an issue where clicking "Show" on a guest without a Graphics Controller causes issues.

---

Downgraded to VirtualBox 6.0.4 to fix this issue on a production server. Multiple Virtual Machines power off as expected.

Perhaps configuring a guest with "invalid settings" may be the issue, but I have had no issues with running a guest without a graphics controller. I am running a full box with 200+ machines where I believe there may be unnecessary overhead with a Graphics Adapter.

[Sage Pointer]

Log file

[Sage Pointer]

Have the same issue. When i set graphics controller to None, it crashes on stopping virtual machine. Any other graphics controller doesn't cause access violation. In my test case, i created even a blank machine, unchecked almost everything to make minimal, and it still crashed if graphics controller is set to None and doesn't if graphic controller is set to anything else.

[sunlover]

Thanks for reporting the problem. It will be fixed in the next release. Also the fix will be in testbuilds 6.0.x revision 130321 or newer (when they will be available). See https://www.virtualbox.org/wiki/Testbuilds