--- old/src/hotspot/os/windows/os_windows.cpp	2017-10-16 14:57:42.659208589 -0700
+++ new/src/hotspot/os/windows/os_windows.cpp	2017-10-16 14:57:42.270172055 -0700
@@ -4057,6 +4057,8 @@
 int os::stat(const char *path, struct stat *sbuf) {
   char pathbuf[MAX_PATH];
   if (strlen(path) > MAX_PATH - 1) {
+    warning("os::stat failed: path length %d exceeds max length %d\n    path %s",
+      strlen(path), MAX_PATH, path);
     errno = ENAMETOOLONG;
     return -1;
   }
@@ -4203,6 +4205,8 @@
   char pathbuf[MAX_PATH];
 
   if (strlen(path) > MAX_PATH - 1) {
+    warning("os::open failed: path length %d exceeds max length %d\n    path %s",
+      strlen(path), MAX_PATH, path);
     errno = ENAMETOOLONG;
     return -1;
   }