diff --git a/src/http/ngx_http_request_body.c b/src/http/ngx_http_request_body.c
index f3b9383..07e78d7 100644
--- a/src/http/ngx_http_request_body.c
+++ b/src/http/ngx_http_request_body.c
@@ -305,6 +305,9 @@
                         return NGX_AGAIN;
                     }
 
+                    ngx_log_error(NGX_LOG_ALERT, c->log, 0,
+                                  "busy buffers after request body flush");
+
                     return NGX_HTTP_INTERNAL_SERVER_ERROR;
                 }