[Bug 203820] kernel panic when trying to unload vmm(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203820

--- Comment #2 from martin ilavsky <ilavsky.martin at gmail.com> ---
I neglected to mention this machine is using VirtualBox; it hosts several VMs
(here all VMs are VirtualBox's VMs). 

I did following tests:

0) fresh boot without any VirtualBox kernel modules
1) fresh boot with VirtualBox modules loaded but no VM running
2) same as 1) but with at least one VM running

During kldunload kernel crashed only when VM was running. Any other time unload
was successful. Also if I started the VM, suspended it and then removed the vmm
everything was ok. 

Crash occurs in the same function (step) as mentioned above. I was able to
reproduce it every time when VM was running.

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