Buglyst
Explore Practice
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Concurrency

Practice stale locks, duplicate workers, race conditions, async cleanup, and atomicity failures.

Skills trained

  • checkReason about interleavings
  • checkVerify lock cleanup
  • checkProtect idempotency

Recommended path

terminalThe Flaky Retry
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Ready incidents

Playable now through the existing challenge engine.

terminalThe Flaky Retry
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Planned Debugging 50 patterns

Visible for roadmap context only. These entries are not playable.

32Idempotency Key Ignored
Planned
35Lock Not Released On Error
Planned
40Async Cleanup Race
Planned
45Rate Limiter Shared Globally
Planned
47Partial Refund Race
Planned
49Queue Consumer Drops Failures
Planned
50Worker Processes Same Job Twice
Planned
56Saga Compensation Missing
Planned
60Distributed Lock Clock Skew
Planned