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java.sql.SQLException: Error writing file '/tmp/MY6orYUR' (Errcode: 28 - No space left on device)

Query being executed when exception was thrown:
SELECT t.*, p.user_id AS last_user_id, p.post_time, p.post_edit_time, (SELECT SUM(p.attach) FROM jforum_posts p WHERE p.topic_id = t.topic_id AND p.need_moderate = 0) AS attach FROM jforum_topics t, jforum_posts p WHERE p.post_id = t.topic_last_post_id AND p.need_moderate = 0 ORDER BY t.topic_views DESC LIMIT 50