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Date: Tue, 12 Oct 2010 17:40:21 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Jeremy Chadwick <freebsd@jdc.parodius.com>
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Cc: freebsd-fs@freebsd.org
Subject: Re: Locked up processes after upgrade to ZFS v15
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on 12/10/2010 17:35 Jeremy Chadwick said the following:
> Nope, but since it's a single-CPU system I can probably enable it
> safely (I thought I remember something about CTF not working right on
> SMP systems...).  Give me a little while to figure out how to get it

Never heard about such issue and never hit them on my two-core systems.

> working, assuming you're willing to step me through what I need to do to
> simulate the lock condition.  :-)

Enabling DTrace is really easy:
http://wiki.freebsd.org/DTrace

I would appreciate if you could enable it on your test system.

-- 
Andriy Gapon