Many times I pointed out the importance of testing technical previews, latest releases of other OS using VirtualBox as the early releases are prone to have frustrating bugs, which are many time specific to a particular hardware or distro. I was playing around with Oracle linux 7, which is a forked version of Red Hat Linux 7, named Unbrekable Linux by Oracle. Relatively I hardly had many issues with guest OS in recent times while tested over VirtualBox and with OEL 7 guest, all of a sudden I started getting memory read errors like the one you can find with below image,
once after the guest addons were installed. Although the change log of VirtualBox for 4.3.28 states the 3D bugs fix, 3D acceleration is the main culprit for the guest crashing once after a login attempt.
VirtualBox change log: https://www.virtualbox.org/wiki/Changelog
So, all you need to do is to disable the 3D acceleration for the guest using the settings panel. Well, unless you are going to use your VM for some “gaming” ;) I think this temporary fix should get you online with your CentOS/OEL 7.1 VM box!
Additional reading: https://www.virtualbox.org/ticket/13332