diff --git a/a8/udplistener.cc b/a8/udplistener.cc
index 6003960..488d045 100644
--- a/a8/udplistener.cc
+++ b/a8/udplistener.cc
@@ -128,6 +128,11 @@ namespace a8
                     pkt->buf_len = ret;
                     pkt->remote_addr = from_addr;
                     master->on_recv_packet(pkt);
+                } else {
+                    f8::UdpLog::Instance()->Debug("recvfrom error ret:%d",
+                                                  {
+                                                   ret
+                                                  });
                 }
             }
         }