When attempting to free an update list in MongoDB 3.0 we hit the assertion in _free_update_list as one of the updates in this list does not pass _wt_txn_visible_all

In this case, the upd->txnid is 7604 and the oldest_id is 7578.

Sessions flags is 9, force discard flag is 4, so not-set.

There is no checkpoint running and checkpoint_pinned is 0.