Introduction

Go out of memory occurs when unbounded channel accumulates messages without consumers. This guide provides step-by-step diagnosis and resolution with specific commands and code examples.

Symptoms

Typical symptoms and error messages when this issue occurs:

bash
fatal error: runtime: out of memory
channel buffer grows unbounded

Observable indicators: - Application logs show connection or operation failures - Error messages appear in system or application logs - Related dependent services may exhibit cascading failures

Common Causes

  1. 1.Concurrency issues stem from:
  2. 2.Improper synchronization primitives usage
  3. 3.Missing context propagation across goroutines
  4. 4.Deadlocks from lock ordering violations

Step-by-Step Fix

Step 1: Check Current State

bash
go version && go env

Step 2: Identify Root Cause

bash
go build -v ./...

Step 3: Apply Primary Fix

go
// Primary fix: update configuration
cfg := Config{
    Timeout:   30 * time.Second,
    MaxRetry:  3,
    LogLevel:  "info",
}

Apply this configuration and restart the application:

bash
go build && ./application

Step 4: Apply Alternative Fix (If Needed)

go
// Alternative fix: use context with timeout
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
result, err := operation.WithContext(ctx)

Use go test -race to verify no race conditions remain after the fix.

Step 5: Verify the Fix

After applying the fix, verify with:

bash
go test -race -v ./pkg/concurrency

Expected output should show successful operation without errors.

Common Pitfalls

  • Sending on closed channel causes panic
  • Receiving from nil channel blocks forever
  • Not draining channel before closing

Best Practices

  • Read official documentation first
  • Test in isolated environment
  • Document changes for team visibility
  • Go Channel Deadlock
  • Go Goroutine Leak
  • Go WaitGroup Add After Wait