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Date:      Sat, 3 Nov 2007 16:42:31 +0000
From:      David Taylor <davidt@yadt.co.uk>
To:        freebsd-current@freebsd.org
Subject:   Re: ZFS Hangs
Message-ID:  <20071103164231.GB23714@outcold.yadt.co.uk>
In-Reply-To: <200711021208.25913.Thomas.Sparrevohn@btinternet.com>
References:  <200711021208.25913.Thomas.Sparrevohn@btinternet.com>

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On Fri, 02 Nov 2007, Thomas Sparrevohn wrote:

> 
> Hi
> 
> One of the recent changes (after 28/10) has started making CURRENT hang in a wait state called zfs:(&zio->io_cv) - As the machine just has been rebuild 
> I cannot narrow it down any more than that

I have seen a number of processes appear to hang in that state.

For example, pkg_delete seems to be _extremely_ slow and ^T reports that
it is stuck waiting on zfs:(&zio->io_cv) for an unreasonable (IMO) amount
of time.

I may once have been forced to reboot the system due to this problem
"spreading" to other processes, but I had no time nor ability to 
investigate it further, so I'm not even sure it was the same problem.

-- 
David Taylor 



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