dns_update has been fixed

Author: ZigzagAK

nginx.conf

@@ -65,9 +65,7 @@ http {
         listen 6003;
 
         location / {
-          content_by_lua_block {
-            ngx.say("hello")
-          }
+          echo hello;
         }
     }
 }

src/ngx_http_dynamic_upstream_module.cpp

@@ -959,6 +959,7 @@ template <class S> struct upstream_sync_functor
         dscf->next = now + dscf->interval;
 
         op.op = NGX_DYNAMIC_UPSTEAM_OP_SYNC;
+        op.hash = 0;
         op.upstream = uscf->host;
         op.op_param |= NGX_DYNAMIC_UPSTEAM_OP_PARAM_RESOLVE_SYNC;
         if (dscf->ipv6 == 1)