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Date: Tue, 01 Jan 2008 14:52:20 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Mikhail Teterin <mi@bonkers.video-collage.com>
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Cc: efinleywork@efinley.com, current@FreeBSD.org
Subject: Re: a new way to hang 7.0
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Mikhail Teterin wrote:
>>> After correcting the destination path and REBOOTING, the dump
>>> is proceeding. I removed the L-flag too, just in case :(
>>>
>>> Is this really a new way, or is it well known already? Thanks!
>> -L has been hanging systems ever since it existed.  Don't use it.
> 
> Why does `dump' implore me to use it, then?

Because the previous poster is being uncharitable with the facts :) 
There are a history of problems with -L (more generally, UFS snapshots), 
but these are believed to have been fixed over the past 2 years.  Since 
you are claiming to have found a new one, please follow up with the 
usual kernel debugging so someone can try and study it.

 > I wonder, if this is also
> a problem on DragonFlyBSD...

Since Dragonfly is FreeBSD 4 + some stuff it is unlikely that it even 
supports UFS snapshots.

Kris