1 files changed, 8 insertions, 2 deletions
diff --git a/src/event/modules/ngx_rtsig_module.c b/src/event/modules/ngx_rtsig_module.c
index 92e33a013..9c5df5d2f 100644
--- a/src/event/modules/ngx_rtsig_module.c
+++ b/src/event/modules/ngx_rtsig_module.c
@@ -428,10 +428,16 @@ ngx_rtsig_process_events(ngx_cycle_t *cycle)
             return NGX_OK;
         }
 
-        /* TODO: old_cycles */
-
         c = ngx_cycle->files[si.si_fd];
 
+        if (c == NULL) {
+            /* the stale event */
+
+            ngx_accept_mutex_unlock();
+
+            return NGX_OK;
+        }
+
         instance = signo - rtscf->signo;
 
         rev = c->read;