Sony PlayStation 3 'leap year' bug
Older-model PlayStation 3 consoles worldwide malfunctioned or became unusable for a day, disrupting games, trophies, and some non-gaming functions for millions of users.
The damage was public. The root cause was preventable.
Older-model PlayStation 3 consoles worldwide malfunctioned or became unusable for a day, disrupting games, trophies, and some non-gaming functions for millions of users.
What the software actually got wrong
A bug in the console's internal clock software caused it to misidentify 2010 as a leap year, an error in its date-handling logic that cascaded into failures across multiple system functions until the clock rolled over to the next day.
A bug in the console's internal clock software caused...
A bug in the console's internal clock software caused it to misidentify 2010 as a leap year, an error in its date-handling logic that cascaded into failures across multiple system functions until the clock rolled over to the next day.
Requs AI Edge Case flags this exact pattern at the requirements and architecture stage — before a single line of code implementing it exists — so the assumption behind it gets challenged while it is still cheap to fix.
Beyond code coverage and "shall" testing
Root causes like this one rarely show up in code coverage or requirements-compliance testing, because nobody wrote a requirement anticipating the specific edge case that broke. Requs AI Edge Case and Requs AI Software FMEA are built to surface exactly this class of overlooked failure mode — before the software is written.
Surfaces this before code exists
Identifies edge cases like this one at requirements and architecture time, using the Common Defect Enumeration to catalog failure patterns seen across hundreds of real-world software failures — including this one.
Connects the failure mode to the hazard
Traces this class of root cause directly to the system-level hazard it can produce, so a defect pattern like this one gets flagged during design review instead of after it ships.
Find the overlooked root causes before they ship.
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