On my Centos7 box, after an update I lost the kernel sources. Virtualbox would no longer start a VM due to updates requiring a recompile.
Running usr/sbin/rcvboxdrv setup
showed some errors in cat /var/log/vbox-install.log
After removing & reinstalling kernel sources and running above command again, Virtualbox recompiled the kernel.
yum remove kernel-devel gcc
yum install kernel-devel gcc
Unfortunately this may remove some dependencies also, backup your environment!
Then had to reboot to avoid the "Creating a process..." message for VirtualBox.
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