diff --git a/lib_fiber/c/Makefile b/lib_fiber/c/Makefile
index 30574a1e6..dfa05f931 100644
--- a/lib_fiber/c/Makefile
+++ b/lib_fiber/c/Makefile
@@ -27,6 +27,7 @@ CFLAGS = -c -g -W \
 -DUSE_FAST_RING \
 -O3 \
 -DUSE_CLOCK_GETTIME \
+-DDEBUG_READY \
 #-DUSE_VALGRIND \
 #-DUSE_INLINE_MEMCPY\
 #-DUSE_FAST_TIME \
diff --git a/lib_fiber/c/src/common/timer_cache.c b/lib_fiber/c/src/common/timer_cache.c
index 9fcd5c184..07ce2ff2d 100644
--- a/lib_fiber/c/src/common/timer_cache.c
+++ b/lib_fiber/c/src/common/timer_cache.c
@@ -41,6 +41,7 @@ TIMER_CACHE *timer_cache_create(void)
 	ring_init(&cache->caches);
 	cache->cache_max = 1000;
 	cache->objs = array_create(100, ARRAY_F_UNORDER);
+	cache->objs2 = array_create(100, ARRAY_F_UNORDER);
 
 	return cache;
 }
@@ -69,6 +70,7 @@ void timer_cache_free(TIMER_CACHE *cache)
 	}
 
 	array_free(cache->objs, NULL);
+	array_free(cache->objs2, NULL);
 	mem_free(cache);
 }
 
diff --git a/lib_fiber/c/src/common/timer_cache.h b/lib_fiber/c/src/common/timer_cache.h
index bb9ee6cbe..2dc676d8b 100644
--- a/lib_fiber/c/src/common/timer_cache.h
+++ b/lib_fiber/c/src/common/timer_cache.h
@@ -23,6 +23,7 @@ struct TIMER_CACHE {
 	RING caches;		// Caching the TIMER_CACHE_NODE memory
 	int cache_max;
 	ARRAY *objs;		// Holding any object temporarily.
+	ARRAY *objs2;		// Holding any object temporarily.
 };
 
 TIMER_CACHE *timer_cache_create(void);
diff --git a/lib_fiber/c/src/event.h b/lib_fiber/c/src/event.h
index b6a0a7a21..a2f3f9407 100644
--- a/lib_fiber/c/src/event.h
+++ b/lib_fiber/c/src/event.h
@@ -99,10 +99,24 @@ typedef struct IO_URING_CTX {
 /**
  * for each connection fd
  */
+
+#define PIN_FILE(f) {                                                        \
+	SET_TIME((f)->stamp);                                                 \
+	(f)->line = __LINE__;                                                 \
+	SAFE_STRNCPY((f)->tag, __FUNCTION__, sizeof((f)->tag));               \
+}
+
 struct FILE_EVENT {
 	RING       me;
 	ACL_FIBER *fiber_r;
 	ACL_FIBER *fiber_w;
+
+#ifdef DEBUG_READY
+	long long stamp;
+	char tag[32];
+	int  line;
+#endif
+
 	socket_t   fd;
 	int id;
 	unsigned status;
diff --git a/lib_fiber/c/src/fiber.h b/lib_fiber/c/src/fiber.h
index 83f1c5446..1b665890c 100644
--- a/lib_fiber/c/src/fiber.h
+++ b/lib_fiber/c/src/fiber.h
@@ -85,8 +85,6 @@ struct ACL_FIBER {
 	FIBER_LOCAL  **locals;
 	int            nlocal;
 
-#define DEBUG_READY
-
 #ifdef DEBUG_READY
 	int            cline;
 	int            lline;
diff --git a/lib_fiber/c/src/fiber_io.c b/lib_fiber/c/src/fiber_io.c
index f849bdfca..6d70c037f 100644
--- a/lib_fiber/c/src/fiber_io.c
+++ b/lib_fiber/c/src/fiber_io.c
@@ -231,10 +231,15 @@ static void wakeup_timers(TIMER_CACHE *timers, long long now)
 			FIBER_READY(fb);
 		}
 
+		array_append(timers->objs2, node);
+
 		next = TIMER_NEXT(timers, node);
-		timer_cache_free_node(timers, node);
 		node = next;
 	}
+
+	while ((node = (TIMER_CACHE_NODE*) array_pop_back(timers->objs2))) {
+		timer_cache_free_node(timers, node);
+	}
 }
 
 static void fiber_io_loop(ACL_FIBER *self fiber_unused, void *ctx)
@@ -508,9 +513,13 @@ int fiber_wait_read(FILE_EVENT *fe)
 #endif
 	}
 
-	fe->fiber_r->wstatus &= ~FIBER_WAIT_READ;
+	curr->wstatus &= ~FIBER_WAIT_READ;
 	fe->fiber_r = NULL;
 
+#ifdef	DEBUG_READY
+	PIN_FILE(fe);
+#endif
+
 	if (!(fe->type & TYPE_INTERNAL)) {
 		WAITER_DEC(__thread_fiber->event);
 	}
@@ -521,7 +530,6 @@ int fiber_wait_read(FILE_EVENT *fe)
 		// fiber's wakeup process wasn't from read_callback normally.
 		event_del_read(__thread_fiber->event, fe, 1);
 		acl_fiber_set_error(curr->errnum);
-		fiber_timer_del(curr);
 		return -1;
 	} else if (curr->flag & FIBER_F_TIMER) {
 		// If the IO reading timeout set in setsockopt.
@@ -534,8 +542,6 @@ int fiber_wait_read(FILE_EVENT *fe)
 		acl_fiber_set_errno(curr, FIBER_EAGAIN);
 		acl_fiber_set_error(FIBER_EAGAIN);
 		return -1;
-	} else if ((fe->mask & EVENT_SO_RCVTIMEO) && fe->r_timeout > 0) {
-		fiber_timer_del(curr);
 	}
 	// else: the IO read event should has been removed in read_callback.
 
@@ -589,7 +595,7 @@ int fiber_wait_write(FILE_EVENT *fe)
 
 	acl_fiber_switch();
 
-	fe->fiber_w->wstatus &= ~FIBER_WAIT_WRITE;
+	curr->wstatus &= ~FIBER_WAIT_WRITE;
 	fe->fiber_w = NULL;
 
 	if (!(fe->type & TYPE_INTERNAL)) {
@@ -599,7 +605,6 @@ int fiber_wait_write(FILE_EVENT *fe)
 	if (acl_fiber_canceled(curr)) {
 		event_del_write(__thread_fiber->event, fe, 1);
 		acl_fiber_set_error(curr->errnum);
-		fiber_timer_del(curr);
 		return -1;
 	} else if (curr->flag & FIBER_F_TIMER) {
 		curr->flag &= ~FIBER_F_TIMER;
@@ -608,8 +613,6 @@ int fiber_wait_write(FILE_EVENT *fe)
 		acl_fiber_set_errno(curr, FIBER_EAGAIN);
 		acl_fiber_set_error(FIBER_EAGAIN);
 		return -1;
-	} else if ((fe->mask & EVENT_SO_SNDTIMEO) && fe->w_timeout > 0) {
-		fiber_timer_del(curr);
 	}
 
 	return ret;
diff --git a/lib_fiber/c/src/hook/poll.c b/lib_fiber/c/src/hook/poll.c
index dcabdaeb9..ca4f33716 100644
--- a/lib_fiber/c/src/hook/poll.c
+++ b/lib_fiber/c/src/hook/poll.c
@@ -42,6 +42,10 @@ static void handle_poll_read(EVENT *ev, FILE_EVENT *fe, POLLFD *pfd)
 
 	pfd->fe->fiber_r = NULL;
 
+#ifdef	DEBUG_READY
+	PIN_FILE(pfd->fe);
+#endif
+
 	if (!(pfd->pfd->events & POLLOUT)) {
 		ring_detach(&pfd->me);
 		pfd->fe = NULL;
@@ -211,6 +215,10 @@ static void poll_event_clean(EVENT *ev, POLL_EVENT *pe)
 #endif
 			event_del_read(ev, pfd->fe, 0);
 			pfd->fe->fiber_r = NULL;
+
+#ifdef	DEBUG_READY
+			PIN_FILE(pfd->fe);
+#endif
 		}
 		if (pfd->pfd->events & POLLOUT) {
 			CLR_WRITEWAIT(pfd->fe);