[an error occurred while processing this directive] Frequently Asked Questions for FreeBSD 2.X : System Administration : Why do I get a ``CMAP busy panic during boot just after installing a new kernel?
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9.5. Why do I get a ``CMAP busy panic during boot just after installing 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

Frequently Asked Questions for FreeBSD 2.X : System Administration : Why do I get a ``CMAP busy panic during boot just after installing a new kernel?
Previous: My keyboard mappings are wrong for my system. How can I fix them?
Next: I'm trying to use quotas for my users and it keeps bombing... [an error occurred while processing this directive]