diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 6094b2e9058b0cb6a186159fa422e494f1d36a14..91a8c435e825c568dcf84ceb8faf0a0872d5bcae 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1786,10 +1786,16 @@ static int ep_send_events(struct eventpoll *ep,
 {
 	struct ep_send_events_data esed;
 
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: ep_send_events start\n");
+
 	esed.maxevents = maxevents;
 	esed.events = events;
 
 	ep_scan_ready_list(ep, ep_send_events_proc, &esed, 0, false);
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: ep_send_events end\n");
+
 	return esed.res;
 }
 
@@ -1831,6 +1837,8 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
 
 	lockdep_assert_irqs_enabled();
 
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: ep_poll start timeout:%ld\n", timeout);
 	if (timeout > 0) {
 		struct timespec64 end_time = ep_set_mstimeout(timeout);
 
@@ -1870,6 +1878,8 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
 	 */
 	ep_reset_busy_poll_napi_id(ep);
 
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: ep_poll before loop\n");
 	do {
 		/*
 		 * Internally init_wait() uses autoremove_wake_function(),
@@ -1908,6 +1918,8 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
 		}
 		write_unlock_irq(&ep->lock);
 
+		if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+			pr_err("epollwait: before schedule_hrtimeout_range\n");
 		if (!eavail && !res)
 			timed_out = !schedule_hrtimeout_range(to, slack,
 							      HRTIMER_MODE_ABS);
@@ -1919,10 +1931,15 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
 		 */
 		eavail = 1;
 	} while (0);
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: ep_poll after loop\n");
 
 	__set_current_state(TASK_RUNNING);
 
 	if (!list_empty_careful(&wait.entry)) {
+		if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+			pr_err("epollwait: ep_poll in list_empty_careful\n");
+
 		write_lock_irq(&ep->lock);
 		/*
 		 * If the thread timed out and is not on the wait queue, it
@@ -1937,6 +1954,8 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
 	}
 
 send_events:
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: ep_poll after send_events\n");
 	if (fatal_signal_pending(current)) {
 		/*
 		 * Always short-circuit for fatal signals to allow
@@ -1955,6 +1974,8 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
 	    !(res = ep_send_events(ep, events, maxevents)) && !timed_out)
 		goto fetch_events;
 
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: ep_poll end\n");
 	return res;
 }
 
@@ -2305,6 +2326,8 @@ static int do_epoll_wait(int epfd, struct epoll_event __user *events,
 	struct fd f;
 	struct eventpoll *ep;
 
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: do_epoll_wait start\n");
 	/* The maximum number of event must be greater than zero */
 	if (maxevents <= 0 || maxevents > EP_MAX_EVENTS)
 		return -EINVAL;
@@ -2333,7 +2356,11 @@ static int do_epoll_wait(int epfd, struct epoll_event __user *events,
 	ep = f.file->private_data;
 
 	/* Time to fish for events ... */
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: before do_epoll_wait\n");
 	error = ep_poll(ep, events, maxevents, timeout);
+	if (strncmp(current->comm, "nStackXDFinder", 14) == 0)
+		pr_err("epollwait: do_epoll_wait end\n");
 
 error_fput:
 	fdput(f);