Show HN: Deadlog – almost drop-in mutex for debugging Go deadlocks

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Frequently Asked Questions

What is Deadlog and how does it help debug Go deadlocks?

Deadlog is an open-source, nearly drop-in replacement for Go's standard sync.Mutex that helps developers detect and diagnose deadlocks in concurrent applications. It works by logging lock acquisition order and identifying circular dependencies that cause goroutines to hang indefinitely. Instead of staring at frozen processes, you get clear reports showing exactly which locks are contending — saving hours of manual debugging on complex concurrent Go codebases.

How do I integrate Deadlog into an existing Go project?

Integration is straightforward since Deadlog is designed as an almost drop-in replacement. You swap sync.Mutex with Deadlog's mutex type in your code, typically requiring only import path changes and minimal refactoring. Enable it during development and testing, then disable it in production to avoid overhead. For teams managing multiple Go microservices, platforms like Mewayz offer 207 modules at $19/mo that can streamline deployment workflows alongside debugging tools like Deadlog.

Can Deadlog be used safely in production environments?

Deadlog is primarily intended for development and staging environments. The instrumentation adds performance overhead through lock tracking and logging, which makes it unsuitable for latency-sensitive production workloads. The recommended approach is to enable Deadlog during testing and CI pipelines to catch deadlocks before they reach production. Once you've identified and resolved contention issues, switch back to the standard sync.Mutex for optimal runtime performance.

What are common causes of deadlocks in Go, and how can I prevent them?

Deadlocks in Go typically arise from inconsistent lock ordering, nested locks acquired in different sequences, or goroutines waiting on channels that never receive values. Prevention strategies include always acquiring locks in a consistent global order, using timeouts with context.Context, and leveraging tools like Deadlog for early detection. Mewayz's 207 development modules, available at $19/mo, include resources on Go concurrency best practices to help teams build robust, deadlock-free applications.