We have just got a hang like this.
Here's the output of ps -ef | grep zfs:

root   425     7   0   Jun 17 console     0:00 /usr/lib/saf/ttymon -g -d 
/dev/console -l console -m ldterm,ttcompat -h -p zfs0
root 22879 22876   0 18:18:37 ?           0:01 /usr/sbin/zfs rollback -r 
tank/aaaaaa    
root 22884     1   0 18:19:02 ?           0:00 /usr/sbin/zfs clone 
tank/templates/xxxxx tank/yyyyyy
root 23188 23006   0 18:42:50 pts/8       0:00 grep z
root 22883 22826   0 18:19:01 ?           0:00 /usr/sbin/zfs destroy -rf 
tank/aaaaaa    
root 22880 22855   0 18:18:37 ?           0:01 /usr/sbin/zfs rollback -r 
tank/aaaaaa    
root 22930     1   0 18:24:33 ?           0:00 /usr/sbin/zfs clone tank/bbbbbb 
tank/ccccccc    
root 22961 23010   0 18:25:42 pts/2       0:00 zfs list
root 22995 22945   0 18:27:11 pts/4       0:00 zfs list


I have created a crash dump, though it is rather large (around .5GB compressed).
Should i upload it here (i would rather not), or is there someone i should send 
it to directly?

The symptoms are otherwise the same - destroy hangs, process is not killable 
even by kill -9, all other zfs commands are hanging waiting for this to 
complete, even "zfs list".
-- 
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