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Date: Tue, 29 Jan 2008 20:13:26 -0800
From: "David O'Brien" <obrien@freebsd.org>
To: Dennis Glatting <freebsd@penx.com>
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X-Operating-System: FreeBSD 8.0-CURRENT
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Cc: freebsd-amd64@freebsd.org
Subject: Re: Multi processor locking problem under 7.0
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On Sat, Jan 26, 2008 at 03:58:19PM -0700, Dennis Glatting wrote:
> I have several systems of two different types running 7.0. One is an IBM
> 3550 and the other a Dell 2950. The IBMs more than the Dells
> consistently seem to have a kernel locking problem during dump.
> Specifically, if I execute this command:
> 
> 	dump 0uaLCf 64 /dev/null /usr
> 
> Dump consistently stops in Phase IV.

This isn't an amd64-specific problem.  You should ask in
freebsd-current@.  It affect all MP.