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From: John Baldwin <jhb@freebsd.org>
To: freebsd-stable@freebsd.org
Subject: Re: Recent 10-STABLE powers off during boot if SMP is enabled
Date: Tue, 12 Aug 2014 16:17:13 -0400
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 (bigwig.baldwin.cx); Tue, 12 Aug 2014 16:20:27 -0400 (EDT)
Cc: Nikolay Denev <ndenev@gmail.com>
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On Monday, July 28, 2014 4:02:36 pm Nikolay Denev wrote:
> Hi,
> 
> I've just upgraded from a few months old 10-STABLE to today's
> 10-STABLE and suddenly
> my machine started to poweroff during boot.
> The machine itself is a bit old and quirky (HP ex470) and the kernel
> is with RCTL, VIMAGE and other stuff not in GENERIC.
> 
> The last thing that flashes on the screen before powering off is this
> : http://tinypic.com/r/2uf3oqt/8
> 
> I've then tried to add "kern.smp.disabled=1" in /boot/loader.conf and
> it boots Ok with one CPU.
> 
> Any ideas?

Can you either: 1) attach a serial console, or 2) bisect which revision 
triggers the poweroff?

-- 
John Baldwin