diff --git a/src/EpollEventPoll.cc b/src/EpollEventPoll.cc
index 317ed8a0..4aff1161 100644
--- a/src/EpollEventPoll.cc
+++ b/src/EpollEventPoll.cc
@@ -123,8 +123,11 @@ void EpollEventPoll::poll(const struct timeval& tv)
       KSocketEntry* p = reinterpret_cast<KSocketEntry*>(epEvents_[i].data.ptr);
       p->processEvents(epEvents_[i].events);
     }
+  } else if(res == -1) {
+    int errNum = errno;
+    A2_LOG_INFO(fmt("epoll_wait error: %s",
+                    util::safeStrerror(errNum).c_str()));
   }
-
 #ifdef ENABLE_ASYNC_DNS
   // It turns out that we have to call ares_process_fd before ares's
   // own timeout and ares may create new sockets or closes socket in
diff --git a/src/KqueueEventPoll.cc b/src/KqueueEventPoll.cc
index 8e30440d..688bc91f 100644
--- a/src/KqueueEventPoll.cc
+++ b/src/KqueueEventPoll.cc
@@ -133,8 +133,10 @@ void KqueueEventPoll::poll(const struct timeval& tv)
       }
       p->processEvents(events);
     }
+  } else if(res == -1) {
+    int errNum = errno;
+    A2_LOG_INFO(fmt("kevent error: %s", util::safeStrerror(errNum).c_str()));
   }
-
 #ifdef ENABLE_ASYNC_DNS
   // It turns out that we have to call ares_process_fd before ares's
   // own timeout and ares may create new sockets or closes socket in
diff --git a/src/PollEventPoll.cc b/src/PollEventPoll.cc
index e5933e24..9d0ddaad 100644
--- a/src/PollEventPoll.cc
+++ b/src/PollEventPoll.cc
@@ -111,6 +111,9 @@ void PollEventPoll::poll(const struct timeval& tv)
         }
       }
     }
+  } else if(res == -1) {
+    int errNum = errno;
+    A2_LOG_INFO(fmt("poll error: %s", util::safeStrerror(errNum).c_str()));
   }
 #ifdef ENABLE_ASYNC_DNS
   // It turns out that we have to call ares_process_fd before ares's
diff --git a/src/PortEventPoll.cc b/src/PortEventPoll.cc
index 10766a67..db4cb9fb 100644
--- a/src/PortEventPoll.cc
+++ b/src/PortEventPoll.cc
@@ -131,6 +131,9 @@ void PortEventPoll::poll(const struct timeval& tv)
                          util::safeStrerror(errNum).c_str()));
       }
     }
+  } else if(res == -1) {
+    int errNum = errno;
+    A2_LOG_INFO(fmt("port_getn error: %s", util::safeStrerror(errNum).c_str()));
   }
 #ifdef ENABLE_ASYNC_DNS
   // It turns out that we have to call ares_process_fd before ares's
diff --git a/src/SelectEventPoll.cc b/src/SelectEventPoll.cc
index b541631d..3c40bd87 100644
--- a/src/SelectEventPoll.cc
+++ b/src/SelectEventPoll.cc
@@ -213,6 +213,9 @@ void SelectEventPoll::poll(const struct timeval& tv)
       }
       (*i)->processEvents(events);
     }
+  } else if(res == -1) {
+    int errNum = errno;
+    A2_LOG_INFO(fmt("select error: %s", util::safeStrerror(errNum).c_str()));
   }
 #ifdef ENABLE_ASYNC_DNS