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Concurrent programs are notoriously difficult to write and debug, a problem that is becoming acute as concurrency becomes more common. A fundamental and particularly insidious concurrency bug is a race: a condition in which a pair of threads simultaneously access the same memory location and at least one of those accesses is a write. Despite thirty years of research on race detection, today's concurrent programs are riddled with races. This talk presents a novel approach to detecting races in concurrent Java programs. The approach is sound in that it detects all races and is precise in that it misidentifies few non-races as races. The approach is also effective, finding tens to hundreds of serious and previously unknown synchronization bugs in real-world programs. ©2007 Microsoft Corporation. All rights reserved.