Unable to Start / Boot VirtualBox VM. It Fails With Error "VT-x is being used by another hypervisor (VERR_VMX_IN_VMX_ROOT_MODE)" (Doc ID 2300689.1)

Last updated on AUGUST 29, 2017

Applies to:

Linux OS - Version Oracle Linux 5.0 and later
Linux x86

Symptoms

Attempts to start VirtualBox VMs on Oracle Linux server fails with following error:

VT-x is being used by another hypervisor (VERR_VMX_IN_VMX_ROOT_MODE).
VirtualBox can't operate in VMX root mode. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_VMX_IN_VMX_ROOT_MODE).

Cause

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