Race Conditions: The Concurrency Bug That Returns With Every New Feature

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Race conditions are a recurring software bug that occurs when two or more requests access shared data simultaneously without proper protection, leading to incorrect outcomes. A common example is two users purchasing the last item in stock at the same moment, both receiving a success confirmation while only one item exists. The problem stems from a gap between when code reads a value and when it writes an update, allowing overlapping requests to act on stale data. Developers and QA teams must each take targeted steps to address concurrency risks, as fixing one feature does not prevent the same flaw from appearing in the next. Unlike typical bugs, race conditions do not require heavy traffic — just two simultaneous requests are enough to expose the vulnerability.

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