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Date: Fri, 10 Jul 2009 11:24:57 +0200
From: Ruben de Groot <mail25@bzerk.org>
To: Jim <stapleton.41@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: jail/system crash with mount_unionfs
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On Thu, Jul 09, 2009 at 10:37:40AM -0400, Jim typed:
> 
> As you can see, there is a work around, so I'm not that /bothered/ by
> this, but it'd be nice to know what's up. Am I doing something wrong?
> If not, can anyone replicate this? Should I file a bug report?

according to the manpage, unionfs is still buggy in 7.2:

BUGS
     THIS FILE SYSTEM TYPE IS NOT YET FULLY SUPPORTED (READ: IT DOESN'T WORK)
     AND USING IT MAY, IN FACT, DESTROY DATA ON YOUR SYSTEM.  USE AT YOUR OWN
     RISK.  BEWARE OF DOG.  SLIPPERY WHEN WET.

I'm using nullfs to do what you're trying and it just works.

regards,
Ruben