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This bug affects multi-row INSERT ... ON DUPLICATE into table with PRIMARY KEY of AUTO_INCREMENT field and some additional UNIQUE indices. If the first row in multi-row INSERT contains duplicated values of UNIQUE indices, then following rows of multi-row INSERT (with either duplicated or unique key field values) may me applied to _arbitrary_ records of table as updates. This bug was introduced in 5.0. Related code was widely rewritten in 5.1, and 5.1 is already free of this problem. 4.1 was not affected too. When updating the row during INSERT ON DUPLICATE KEY UPDATE, we called restore_auto_increment(), which set next_insert_id back to 0, but we forgot to set clear_next_insert_id back to 0. restore_auto_increment() function has been fixed.
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