diff --git a/cmd/playground/main.go b/cmd/playground/main.go
new file mode 100644
index 0000000..8cecad2
--- /dev/null
+++ b/cmd/playground/main.go
@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	fmt.Println("Hello, World!")
+
+	// A goroutine which cause goroutine leak
+	//  this goroutines should cause race condition
+	message := "Hello, World!"
+	go func(s string) {
+		time.Sleep(10 * time.Second)
+		fmt.Println(s)
+	}(message)
+
+	time.Sleep(1 * time.Second)
+	fmt.Println(message)
+}