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Date: Wed, 15 Dec 2010 15:00:57 +0200
From: Andriy Gapon <avg@freebsd.org>
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To: "Vladislav V. Prodan" <universite@ukr.net>
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Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org
Subject: Re: Low speed disk subsystem after the upgrade 8.1-STABLE-201011
 --> 9-CURRENT
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on 15/12/2010 14:18 Vladislav V. Prodan said the following:
> The kernel of the standard, GENERIC
> Similar problems after attempting to install from the disk
> FreeBSD-9.0-CURRENT-201011-amd64-dvd1.iso
> In the latter case, there were cases of complete system lockup.
> 
> The upgrade process:
> cd /usr/src
> make clean
> rm -r /usr/obj
> make buildworld
> make buildkernel KERNCONF=GENERIC
> make installkernel KERNCONF=GENERIC
> make installworld
> 
> 
> What am I doing wrong?
> 

Just a guess - have you looked at UPDATING in CURRENT sources?
But the lock up is totally unexpected, try to debug it.

-- 
Andriy Gapon