From owner-freebsd-hackers@freebsd.org  Thu Dec 24 07:50:47 2015
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Date: Thu, 24 Dec 2015 10:50:41 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: joe mcguckin <joe@via.net>
Cc: hackers@freebsd.org
Subject: Re: ZFS questions, ZFS hang
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On Wed, Dec 23, 2015 at 08:09:36PM -0800, joe mcguckin wrote:

> I have a dual xeon w 16G of ram and 16 drives that I’m using to play around with zfs.
> 
> I was running the 32 bit kernel and everything seemed to work ok. I upgraded to the amd 64 bit
> kernel and I’m seeing the box hang under load. No error messages - it just goes catatonic.
> 
> I’m running the GENERIC kernel. Are there any recommended kernel settings I should be using?

Update to STABLE, some related bug found and fixed.