freebsd stable - Aug 2015 - ia64 stable/10 r286316: hang at Entering /boot/kernel/kernel

ia64 stable/10 r286315 boots, but 
r286316 hangs at "Entering /boot/kernel/kernel".

Please advise

Thanks

Anton

P.S. This is a continuation of
http://lists.freebsd.org/pipermail/freebsd-stable/2015-August/083203.html
However, since I now found the revision
that broke the boot,
I decided to start a new thread.

On Thu, Aug 27, 2015 at 01:12:16PM +0100, Anton Shterenlikht
wrote:
> ia64 stable/10 r286315 boots, but 
> r286316 hangs at "Entering /boot/kernel/kernel".
> 
> Please advise
To state an obvious thing.  The commit which you pointed to, changes
the code which is not executed at that early kernel boot stage.  The
revision cannot cause the consequences you described.

I think that you either have build-environment issue which randomly pops
up, or there is some other boot-time issue which is sporadic.  The only
suggestion I have, try many boots with kernels which look either good
or bad, I would be not surprised if statistic would be completely
different from binary good/bad outcome.

Otherwise, I do not have an idea.