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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Wed, 25 Jul 2012 16:13:04 +0200
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Cc: Erich Dollansky <erichfreebsdlist@ovitrap.com>
Subject: Re: machine freezes when using USB disk and X
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On Wednesday 25 July 2012 14:54:08 Erich Dollansky wrote:
> Hi,
> 
> I have strange problem which I can reproduce.
> 
> When I copy some 100GB to a disk via USB when X is not active, it works
> without any problems.
> 
> When I copy some 100GB to a disk via USB when X is running, the machine
> freezes. It does not react to keyboard, mouse and network actions.
> 
> When I use only X on the same machine and do the same copy via network,
> the machine behaves as expected.
> 
> What could I do to locate the problem?
> 
> Erich
> 
> PS
> 
> uname says:
> 
> FreeBSD AMD620.ovitrap.com 10.0-CURRENT FreeBSD 10.0-CURRENT #38: Sat
> Jul 21 06:58:49 WIT 2012

You might want to check what interrupts are shared. Might be an IRQ problem.

--HPS