Recently I've been having issues with the host machine becoming non-responsive and requiring a full power down to get up and running again. I investigated my normal workflow from KDE plasma 5 and Gnome desktops and found the same problem. I then stopped using various applications one at a time and found that when I have VirtualBox running (version 5.1.
I've attached the VBox.log file from the most recent crash. I don't see anything in particular that raises suspicion, but then I don't know what to look for.
Any help is greatly appreciated.