Reliability & concurrency bugs
“Two of us submitted at the same moment and one of our changes silently vanished.”
Two requests read the same row, each computes a new value from what it read, and both write back. The second write overwrites the first instead of building on it. Serially it is always correct, which is why tests miss it.
Concurrent writes lose an updateblack beltConcurrency testing and read-modify-write hazards
Choose your app
The same mistake, planted in different products. Pick the domain you want to hunt it in.
TapTrust Federal
TapTrust Federal Credit Union · Banking · Online + teller
online.taptrustfederal.test
1 planted defecthunt here →
QualityMart
QualityMart Inc. · Retail · Big-box e-commerce
shop.qualitymart.test
1 planted defecthunt here →
QualityChart
St. Quality Health · Healthcare · EHR
Not seeded here yet — an open seat for a contributor to plant this defect in QualityChart.