[Zope] ZODB Problems

Zope 2.7.3 Python 2.3.4 ZODB 3.2.4 (as released with Python 2.7.3) ZMySQLDA 2.0.9 ------ 2004-11-23T08:22:29 ERROR(200) ZODB A storage error occured during object abort. This shouldn't happen. Traceback (most recent call last): File "/usr/local/src/zope/Zope2.7/lib/python/ZODB/Transaction.py", line 412, in _commit_error j.tpc_abort(self) # This should never fail File "/usr/local/src/zope/Zope2.7/lib/python/Shared/DC/ZRDB/TM.py", line 63, in abort try: self._abort() File "/opt/zope/zproducts/standard/ZMySQLDA/db.py", line 405, in _abort self._tlock.release() error: release unlocked lock ------ I'm seeing this fairly frequently in the event.log. Any hint as to what might be causing it?