Recent 10-STABLE powers off during boot if SMP is enabled

[John Baldwin]

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