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Date: Thu, 11 Jul 2013 06:37:45 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Eduardo Morras <emorrasg@yahoo.es>
Subject: Re: [Bulk] FreeBSD upgrade woes (8.3 -> 8.4)
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 (wonkity.com [127.0.0.1]); Thu, 11 Jul 2013 06:37:46 -0600 (MDT)
Cc: freebsd-questions@freebsd.org, David.I.Noel@gmail.com
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On Thu, 11 Jul 2013, Eduardo Morras wrote:

> On Thu, 11 Jul 2013 04:40:38 -0500
> David Noel <david.i.noel@gmail.com> wrote:
>>
>> I didn't include the make buildworld or make buildkernel for the sake
>> of brevity but yes, I executed them prior to installworld and
>> installkernel.
>
> Perhaps make buildkernel was compiled with -j >1, it's known to create a buggy kernel. Check your make configuration. Adding a -B, like make -B -j N buildkernel may work and is fast if -j is set to number or processors, but it's safer do a make -j 1 buildkernel, same for buildworld.

Is this version-specific?  I've been using -j4 or -j8 for years for 
buildworld and kernel (buildkernel + installkernel) on FreeBSD 8 and 9 
with no problems.  Probably on FreeBSD 7 also, but I don't recall.

installworld is a different matter, always do that with a single job.