Comment 7 for bug 1124503

Forgot to add, updates to that particular table usually take the form:
INSERT INTO bugtest(a, b, c, d, e)
                                VALUES
                                        (6, 'correct', 9, 1, 20)
                                ON DUPLICATE KEY UPDATE
                                        d = d + VALUES(d),
                                        e = e + VALUES(e)

Where the table looks like the following:
CREATE TABLE `bugtest` (
  `a` bigint(20) unsigned NOT NULL,
  `b` enum('correct','incorrect','unanswered','unexpected','invalid','punished') NOT NULL,
  `c` int(10) unsigned NOT NULL,
  `d` bigint(20) unsigned NOT NULL,
  `e` bigint(20) unsigned NOT NULL,
  PRIMARY KEY (`a`,`b`,`c`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1

Apart from that, it's also renamed with:
RENAME TABLE bugtest TO tmptable, morebugtest TO bugtest, tmptable TO morebugtest;

I suspect the combination of both might be triggering this issue, but haven't been able to reproduce it by hand yet...