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Date: Sun, 21 Oct 2012 01:17:16 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Dennis Glatting <freebsd@pki2.com>
Subject: Re: ZFS hang (system #2)
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on 20/10/2012 23:31 Dennis Glatting said the following:
> The following is from a second system working on a 7TB file (started this
> morning), which also hung. However, an important difference is this system's CPU
> is slightly over clocked from 3.6GHz to 4.0GHz; However, prior not over clocking
> made no difference -- it still hanged.
> 
> This system has a Gigabyte GA-990FXA-UD7 board.

To me this again looks like an issue with a stuck zio/bio, and not a deadlock.

> bd3# /mnt/camcontrol tags da7 -v (** OS - RAID1 **)
> (pass7:mps1:0:0:0): dev_openings  215
> (pass7:mps1:0:0:0): dev_active    40
> (pass7:mps1:0:0:0): devq_openings 215
> (pass7:mps1:0:0:0): devq_queued   0
> (pass7:mps1:0:0:0): held          0
> (pass7:mps1:0:0:0): mintags       2
> (pass7:mps1:0:0:0): maxtags       255

Of all the disks this one looks the most suspicious, of course.

Do you have the zio/bio debug patch there and usable kgdb?

-- 
Andriy Gapon