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Date: Sat, 6 Feb 2016 17:04:34 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: Hajimu UMEMOTO <ume@mahoroba.org>
Cc: Steven Hartland <killing@multiplay.co.uk>, freebsd-stable@freebsd.org
Subject: Re: 10-STABLE hangups frequently
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On Sat, Feb 06, 2016 at 11:40:50PM +0900, Hajimu UMEMOTO wrote:
> Hi,
> 
> >>>>> On Tue, 2 Feb 2016 14:52:37 +0200
> >>>>> Konstantin Belousov <kostikbel@gmail.com> said:
> 
> kostikbel> Please gather the information listed at
> kostikbel> https://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
> 
> I tried the instruction.  But, the debugging kernel hang-upped during
> boot.  Therefore I cannot get information.

Where did it hang ?  Provide the verbose dmesg log of the hung boot.
Are you able to enter ddb after the hang ?