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A system for bug discovery using event reports comprises an interface and a processor. The interface is configured to receive symptom data extracted from event reports from a user system. The symptom data is stored in a symptom database. The symptom data comprises one or more symptoms each with a corresponding symptom occurrence time. The processor is configured to compose one or more SQL queries using one or more bug definitions and determine an existence of one or more bugs of the user system based at least in part on a result of querying the symptom database using the one or more SQL queries.