do not update time in the timer signal handler,
since localtime_r() is not Async-Signal-Safe function
diff --git a/src/event/modules/ngx_poll_module.c b/src/event/modules/ngx_poll_module.c
index 10098d6..3b98c19 100644
--- a/src/event/modules/ngx_poll_module.c
+++ b/src/event/modules/ngx_poll_module.c
@@ -262,7 +262,7 @@
 
     err = (ready == -1) ? ngx_errno : 0;
 
-    if (flags & NGX_UPDATE_TIME) {
+    if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) {
         ngx_time_update(0, 0);
     }