diff --git a/src/core/nginx.c b/src/core/nginx.c
index 766257c..3c5f789 100644
--- a/src/core/nginx.c
+++ b/src/core/nginx.c
@@ -140,11 +140,19 @@
 
     cycle = ngx_init_cycle(&init_cycle);
     if (cycle == NULL) {
+        if (ngx_test_config) {
+            ngx_log_error(NGX_LOG_EMERG, log, 0,
+                          "the configuration file %s test failed",
+                          init_cycle.conf_file.data);
+        }
+
         return 1;
     }
 
     if (ngx_test_config) {
-        ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "config syntax is ok");
+        ngx_log_error(NGX_LOG_INFO, log, 0,
+                      "the configuration file %s was tested successfully",
+                      init_cycle.conf_file.data);
         return 0;
     }
 
diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
index 94414ae..bde3171 100644
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -138,6 +138,12 @@
         return NULL;
     }
 
+    if (ngx_test_config) {
+        ngx_log_error(NGX_LOG_INFO, log, 0,
+                      "the configuration file %s syntax is ok",
+                      cycle->conf_file.data);
+    }
+
 
     for (i = 0; ngx_modules[i]; i++) {
         if (ngx_modules[i]->type != NGX_CORE_MODULE) {
@@ -274,10 +280,12 @@
 
 #if !(WIN32)
 
-    if (dup2(cycle->log->file->fd, STDERR_FILENO) == NGX_ERROR) {
-        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
-                      "dup2(STDERR) failed");
-        failed = 1;
+    if (!failed && !ngx_test_config) {
+        if (dup2(cycle->log->file->fd, STDERR_FILENO) == NGX_ERROR) {
+            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
+                          "dup2(STDERR) failed");
+            failed = 1;
+        }
     }
 
 #endif
@@ -299,6 +307,11 @@
             }
         }
 
+        if (ngx_test_config) {
+            ngx_destroy_pool(pool);
+            return NULL;
+        }
+
         ls = cycle->listening.elts;
         for (i = 0; i < cycle->listening.nelts; i++) {
             if (ls[i].new && ls[i].fd == -1) {
diff --git a/src/core/ngx_output_chain.c b/src/core/ngx_output_chain.c
index 285bd83..94e4104 100644
--- a/src/core/ngx_output_chain.c
+++ b/src/core/ngx_output_chain.c
@@ -20,7 +20,7 @@
     ngx_chain_t  *cl, *out, **last_out;
 
     /*
-     * the short path for the case when the chain ctx->in is empty
+     * the short path for the case when the ctx->in chain is empty
      * and the incoming chain is empty too or it has the single hunk
      * that does not require the copy
      */
@@ -54,9 +54,14 @@
 
         while (ctx->in) {
 
+            /*
+             * cycle while there are the ctx->in hunks
+             * or there are the free output hunks to copy in
+             */
+
             if (!ngx_output_chain_need_to_copy(ctx, ctx->in->hunk)) {
 
-                /* move the chain link to the chain out */
+                /* move the chain link to the output chain */
 
                 cl = ctx->in;
                 ctx->in = cl->next;
@@ -133,7 +138,7 @@
                 return rc;
             }
 
-            /* delete the completed hunk from the chain ctx->in */
+            /* delete the completed hunk from the ctx->in chain */
 
             if (ngx_hunk_size(ctx->in->hunk) == 0) {
                 ctx->in = ctx->in->next;
@@ -157,6 +162,10 @@
 
         ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
         last_out = &out;
+
+        if (last == NGX_ERROR) {
+            return last;
+        }
     }
 }