diff --git a/ext/standard/tests/math/bug25665.phpt b/ext/standard/tests/math/bug25665.phpt
new file mode 100644
index 00000000000..138acbb20b6
--- /dev/null
+++ b/ext/standard/tests/math/bug25665.phpt
@@ -0,0 +1,11 @@
+--TEST--
+Bug #25565 (var_dump () hangs on Nan and INF)
+--FILE--
+<?php
+set_time_limit(5);
+var_dump(acos(1.01));
+var_dump(log(0));
+?>
+--EXPECT--
+float(NAN)
+float(-INF)