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From: Antony Uspensky <uspensky@x-art.ru>
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To: Tim Daneliuk <tundra@tundraware.com>
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Subject: Re: Swap Questions
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On Sat, 15 Aug 2015, Tim Daneliuk wrote:

> So -L does fix the problem - sort of.  The machine picks up the file as
> additional swap on boot just fine.  HWOEVER, when I try to reboot or shut
> down the host, I get a panic telling me some noise about not being able
> to shutdown swap for some reason.

Try to swapoff (by hands) before shutdown.
Shutdown sequence, I think, unmounts carrying disk before swapping off 
a carried file. If I am right, -L should be processed on shutdown also.
Just a guess.