zfs diff deadlock

[Peter Jeremy]

On 2012-Nov-11 09:32:49 +1100, Peter Jeremy <peter at server.rulingia.com> wrote:
>I recently decided to do a "zfs diff" between two snapshots to try
>and identify why there was so much "USED" space in the snapshot.
>The diff ran for a while (though with very little IO) but has now
>wedged unkillably.  There's nothing on the console or in any logs,
>the pool reports no problems and there are no other visible FS
>issues.  Any ideas on tracking this down?
...
>The systems is running a 4-month old 8-stable (r237444)

I've tried a second system running the same world with the same result, so
this looks like a real bug in ZFS rather than a system glitch.

-- 
Peter Jeremy
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