--- nginx-0.8.54/src/http/ngx_http_core_module.c	2011-09-27 19:14:02.000000000 +0800
+++ nginx-0.8.54-patched/src/http/ngx_http_core_module.c	2011-10-13 15:02:24.414550532 +0800
@@ -2542,6 +2542,9 @@
             r->content_handler = NULL;
             r->loc_conf = (*clcfp)->loc_conf;
 
+            /* clear the modules contexts */
+            ngx_memzero(r->ctx, sizeof(void *) * ngx_http_max_module);
+
             ngx_http_update_location_config(r);
 
             cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);