description from upstream:

We found some PageCursorInfo in consumedPage map even if these corresponding page file is deleted.
Suppose that there is a topic t with some messages not routed to subscriber ta. When calling ta.deliverAsync(), DeliverRunner->deliver->checkDepage->pageIterator.hasNext->
processACK->cleanup is called in the pageSubscription's executor(step1), then checkDepage->pageIterator.hasNext->processACK->getPageInfo is called(step2). At this time(step2) pageCursorInfo maybe again put into consumedPage when the page is removed from consumedPage but not from softCache(int step1).