Fix verified in lvm2-2.02.56-8.el5_5.2.
attempting down convert to remove primary with up convert in progress:
lvconvert -m 0 mirror_sanity/remove_outta_sync_primary /dev/etherd/e1.1p5
Unable to remove primary mirror image while mirror is not in-sync
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
http://rhn.redhat.com/errata/RHBA-2010-0433.html