diff --git a/io/epoll.cpp b/io/epoll.cpp
index ec8a3fa7..e3ffdedb 100644
--- a/io/epoll.cpp
+++ b/io/epoll.cpp
@@ -302,26 +302,6 @@ ok:     entry.interests |= eint;
         thread* current = CURRENT;
         int ret = add_interest({fd, interest | ONE_SHOT, current});
         if (ret < 0) LOG_ERROR_RETURN(0, -1, "failed to add event interest");
-        // if timeout is just simple 0, wait for a tiny little moment
-        // so that events can be collect.
-        if (timeout.expired()) {
-            ret = -1;
-            wait_for_events(
-                0,
-                [current, &ret](void* data) __INLINE__ {
-                    if ((thread*)data == current) {
-                        ret = 0;
-                    } else {
-                        thread_interrupt((thread*)data, EOK);
-                    }
-                },
-                [&]() __INLINE__ { return true; });
-            if (ret < 0) {
-                rm_interest({fd, interest, 0});
-                errno = ETIMEDOUT;
-            }
-            return ret;
-        }
         ret = thread_usleep(timeout);
         ERRNO err;
         if (ret == -1 && err.no == EOK) {
diff --git a/io/kqueue.cpp b/io/kqueue.cpp
index 90b60659..8f103946 100644
--- a/io/kqueue.cpp
+++ b/io/kqueue.cpp
@@ -122,20 +122,6 @@ class KQueue : public MasterEventEngine, public CascadingEventEngine, public Res
         auto current = CURRENT;
         int ret = enqueue(fd, ev, EV_ADD | EV_ONESHOT, 0, current);
         if (ret < 0) return ret;
-        if (timeout.expired()) {
-            ret = -1;
-            do_wait_and_fire_events(0, [current, &ret](thread* th) {
-                if (th == current)
-                    ret = 0;
-                else
-                    thread_interrupt(th, EOK);
-            });
-            if (ret <0) {
-                enqueue(fd, ev, EV_DELETE, 0, current, true);
-                errno = ETIMEDOUT;
-            }
-            return ret;
-        }
         ret = thread_usleep(timeout);
         ERRNO err;
         if (ret == -1 && err.no == EOK) {
@@ -152,8 +138,13 @@ class KQueue : public MasterEventEngine, public CascadingEventEngine, public Res
     }
 
     int cancel_wait() override {
-        enqueue(_kq, EVFILT_USER, EV_ONESHOT, NOTE_TRIGGER, nullptr, true);
-        return 0;
+        // cannot call `enqueue` directly since it will be called from another vCPU.
+        // directly use kqueue to submit event, which is safe.
+        // as same as `enqueue(_kq, EVFILT_USER, EV_ONESHOT, NOTE_TRIGGER, nullptr, true)`
+        struct kevent entry;
+        EV_SET(&entry, _kq, EVFILT_USER, EV_ONESHOT, NOTE_TRIGGER, 0, nullptr);
+        struct timespec tm{0, 0};
+        return kevent(_kq, _events, _n, nullptr, 0, &tm);
     }
 
     // This vector is used to filter invalid add/rm_interest requests which may affect kevent's