diff --git a/base/src/event_demultiplexer.cpp b/base/src/event_demultiplexer.cpp
index ae5b25494ca2b5c58d7a78c2ddcf118758ad27c3..68c51908fea5476d602f78d5f22c6238b3b95457 100644
--- a/base/src/event_demultiplexer.cpp
+++ b/base/src/event_demultiplexer.cpp
@@ -128,6 +128,8 @@ void EventDemultiplexer::Polling(int timeout /* ms */)
             if (itor != eventHandlers_.end()) {
                 taskQue.emplace_back(itor->second);
                 eventQue.emplace_back(events);
+            } else {
+                UTILS_LOGE("fd not found in eventHandlers_, fd=%{public}d", targetFd);
             }
         }
     }
diff --git a/base/src/timer_event_handler.cpp b/base/src/timer_event_handler.cpp
index aa603ed50e7add9c4b8991a0500add6e29e79a6e..0550661ea6ebaba8371789b3d3e35ae32416b63d 100644
--- a/base/src/timer_event_handler.cpp
+++ b/base/src/timer_event_handler.cpp
@@ -99,7 +99,8 @@ void TimerEventHandler::TimeOut()
     uint64_t expirations = 0;
     ssize_t n = ::read(GetHandle(), &expirations, sizeof(expirations));
     if (n != sizeof(expirations)) {
-        UTILS_LOGE("epoll_loop::on_timer() reads %{public}d bytes instead of 8.", static_cast<int>(n));
+        UTILS_LOGE("epoll_loop::on_timer() reads %{public}d bytes instead of 8, errno=%{public}d", static_cast<int>(n),
+            errno);
     }
     if (callback_) {
         callback_(GetHandle());