The Therac-25 Radiation Overdoses
How Race condition in concurrent programming cost Lives Lost
What Happened?
The The Therac-25 Radiation Overdoses is one of the most infamous examples of a software failure in history. Costing approximately Lives Lost, this incident serves as a grim reminder of why rigorous QA testing is non-negotiable.
The root cause was traced back to Race condition in concurrent programming, a flaw that managed to slip past the development and testing phases into production.
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The Missing Test Cases
What test cases would have caught this bug before it was deployed? Here are the critical scenarios that were missing:
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Edge Case Validation: The system failed to handle extreme edge cases for race condition in concurrent programming. A comprehensive boundary value analysis was required.
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Negative Testing: Handling of unexpected, malformed, or malicious input strings.
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Integration Testing: The interaction between the legacy systems and the newly deployed module was not mocked or tested in a staging environment mirroring production.
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