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Subject: Re: ZFS hang (system #2)
From: Dennis Glatting <freebsd@pki2.com>
To: Andriy Gapon <avg@FreeBSD.org>
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Date: Sat, 20 Oct 2012 15:38:04 -0700
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On Sun, 2012-10-21 at 01:17 +0300, Andriy Gapon wrote:
> 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?
> 

No but I'll apply it and restart. I was curious whether it would hang on
the SSD. The work/stuck process is named "sep".