From owner-freebsd-fs@freebsd.org  Wed Feb 22 21:06:35 2017
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Date: Thu, 23 Feb 2017 00:06:31 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Lev Serebryakov <lev@FreeBSD.org>
Cc: freebsd-stable@freebsd.org, freebsd-fs@freebsd.org
Subject: Re: Is it known problem, that zfs.ko could not be built with system
 compiler (clang 3.9.1) without optimization?
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References: <492944119.20170222234742@serebryakov.spb.ru>
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On Wed, Feb 22, 2017 at 11:47:42PM +0300, Lev Serebryakov wrote:

> Hello Freebsd-stable,
> 
>    Now if you build zfs.ko with -O0 it panics on boot.
> 
>    If you use default optimization level, a lot of fbt DTreace probes are
>   missing.

Is this related to http://llvm.org/bugs/show_bug.cgi?id=18420 ?