- print stack info when goroutine panic.

utils/routinepool/routinepool.go

@@ -4,6 +4,7 @@ import (
 	"crypto/md5"
 	"encoding/binary"
 	"fmt"
+	"runtime/debug"
 )
 
 const (
@@ -46,6 +47,7 @@ func callHandler(handler func()) (retVal interface{}) {
 	defer func() {
 		if r := recover(); r != nil {
 			retVal = r
+			debug.PrintStack()
 		}
 	}()
 	handler()