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The problem is that creating a event could fail if the value of the variable server_id didn't fit in the originator column of the event system table. The cause is two-fold: it was possible to set server_id to a value outside the documented range (from 0 to 2^32-1) and the originator column of the event table didn't have enough room for values in this range. The log tables (general_log and slow_log) also don't have a proper column type to store the server_id and having a large server_id value could prevent queries from being logged. The solution is to ensure that all system tables that store the server_id value have a proper column type (int unsigned) and that the variable can't be set to a value that is not within the range.