Since I updated to mediawiki-1.28.0 from mediawiki-1.26.2 yesterday, I've been getting the following error, usually when I save or preview an edited page, and occasionally when I access a page:
Original exception: [a53679567296387f8f2003e6] /~dabeidle/mediawiki-1.28.0/index.php?title=Main_Page&action=submit DBQueryError from line 1054 of /Users/dabeidle/Sites/mediawiki-1.28.0/includes/libs/rdbms/database/Database.php: A database query error has occurred. Did you forget to run your application's database schema updater after upgrading?
Function: Database::query (MessageCache::loadFromDB(en)-big)
Error: 1 cannot start a transaction within a transaction
If I resubmit the edit page, the changes are saved (usually after the 3rd attempt). On a query, reloading the page works.
One change I made from the previous version was to change the database ownership from _www:_www to my account, with corresponding changes in http.conf. This is a local, private wiki running on macOS Sierra 10.12.1, PHP 5.6.25, SQLite 18.104.22.168 as a personal knowledge base so access from the Internet is not possible.
The questions I have are: "Did I encounter a regression that I need to log as a bug?" in which case I can provide more detail, or "Did I miss something (probably simple) in the upgrade or configuration?"
I followed the upgrade procedure on <http://www.mediawiki.org/wiki/Manual:Upgrading>, including upgrading the SQLite3 database.