zfs discuss - Jan 2010 - I/O errors after zfs promote back and forth

Hi,

I have just observed the following issue and I would like to ask if it is 
already known:

I''m using zones on ZFS filesystems which were cloned from a common
template
(which is itself an original filesystem). A couple of weeks ago, I did a pkg 
image-update, so all zone roots got cloned again and the new zone roots got 
promoted. I then decided to undo the update and promoted the original zone roots
again.

So until today, the zone template was dependend upon one of the zone roots and 
when I promoted it again to restore the intended order, all zones effectively 
crashed. When trying to execute processes in them, I got exec failures like this
one:

# zlogin ZONE
[Connected to zone ''ZONE'' pts/2]
zlogin: exec failure: I/O error

Is this issue known to anyone already?

Thank you, Nils

BTW, this was on snv_111b - sorry I forgot to mention.