[Bug 206005] KDB should give a more helpful error message for encrypted swap

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206005

            Bug ID: 206005
           Summary: KDB should give a more helpful error message for
                    encrypted swap
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tony at git-pull.com

On two systems running 11-CURRENT, I configured encrypted swap (both manually
through shell and through the installer front end).  Both dumps I switched on
the setting for dumping to dev, which added:

dumpdev="AUTO"

to /etc/rc.conf as expected.

However, when panics occur and dropped into KDB, 'dump' would not work:

   Cannot dump: no dump device specified

I ended up going around in circles for a while, until eventually I was
explained it worked by dumping to swap, and I volunteered that my swap was an
eli drive.

So since then, I reconfigured my system to use a swap drive without eli and now
dump works.

I think KDB should give a more helpful message for encrypted swaps. KDB doesn't
support dumping to encrypted swap. This confused me for quite a while, since
there isn't much in handbooks / forums / lists about this shortcoming.

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