``CMAP busy panic'' when rebooting with a new kernel.

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``CMAP busy panic'' when rebooting with a new kernel. Frequently Asked Questions for FreeBSD 2.X : System Administration : ``CMAP busy panic'' when rebooting with a new kernel.
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9.5. ``CMAP busy panic'' when rebooting with a new kernel.

The logic that attempts to detect an out of data /var/db/kvm_*.db files sometimes fails and using a mismatched file can sometimes lead to panics.

If this happens, reboot single-user and do:

            rm /var/db/kvm_*.db