Running PD & VB, PD Crashed

[blackautas]

Mac reboots when you attempt to launch Parallels Desktop 8 and Virtual Box simultaneously

APPLIES TO:
Parallels Desktop 9 for Mac
Parallels Desktop 8 for Mac
Parallels Server Bare Metal
Symptoms
Your Mac may experience occassional crashes while running Parallels Desktop 8 or Parallels Service Bare Metal at the same time as KVM or Virtual Box.
Cause
This issue is caused by incorrectly working third-party virtualization engines that do not ensure that the virtualization state remains consistent with the state of the actual CPU.
Resolution
For KVM:

Set the KVM module variable "vmm_exclusive" to 0.

for Virtual Box:

No workaround is available. Please try not to use Parallels Desktop and Virtual Box at the same time.

[loukingjr]

This has been true for at least two years. But thanks for typing it out again. You shouldn't run VMWare Fusion together with VirtualBox or Parallels either.

[rpmurray]

Mac reboots when you attempt to launch Parallels Desktop 8 and Virtual Box simultaneously

Yes, there's a warning about that in the manual 10.3. Hardware vs. software virtualization

Warning
Do not run other hypervisors (open-source or commercial virtualization products) together with VirtualBox! While several hypervisors can normally be installed in parallel, do not attempt to run several virtual machines from competing hypervisors at the same time. VirtualBox cannot track what another hypervisor is currently attempting to do on the same host, and especially if several products attempt to use hardware virtualization features such as VT-x, this can crash the entire host. Also, within VirtualBox, you can mix software and hardware virtualization when running multiple VMs. In certain cases a small performance penalty will be unavoidable when mixing VT-x and software virtualization VMs. We recommend not mixing virtualization modes if maximum performance and low overhead are essential. This does not apply to AMD-V.