There is one entry logged to dberror.log during a CI run over MediaWiki core. This is blocking re-enablement of the assertion that CI does not produce DB errors, to avoid regressing again. (See parent task.)
Thu Jun 25 16:20:55 UTC 2020 ccd9c66a2b83 wikidb-unittest Wikimedia\Rdbms\Database::commit: no transaction to commit, something got out of sync