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From: "Chris H" <bsd-lists@bsdforge.com>
Subject: Re: Boot failure - svn up from this morning
Date: Thu, 02 Mar 2017 21:16:12 -0800
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On Thu, 2 Mar 2017 21:56:38 -0500 (EST) AN <andy@neu.net> wrote

> Hi:
> 
> I'm having a major problem after updating a 12-current machine today. 
> After buildworld/kernel/install cycle on reboot I'm getting the following 
> failure:
> 
> "/boot/kernel/kernel text=0xb7716f data=0x100548+0x398358
> elf64_loadimage: read failed
> can't load file '/boot/kernel/kernel': input/output error
> can't load file '/boot/kernel/kernel': input/output error
> 
> OK boot kernel.old
> elf64_loadimage: read failed
> can't load file '/boot/kernel.old/kernel': input/output error
> can't load file '/boot/kernel.old/kernel': input/output error"
> 
> I have never experienced this failure before, and don't know how to 
> proceed.  Any help recovering from this would be greatly appreciated. 
> Thanks in advance.

I don't suppose you could post the output of
uname -a

and maybe a copy of dmesg(8) could you?

--Chris