diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug507425.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug507425.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+// |jit-test| allow-oom; 
+function testBug507425() {
+    var r = /x/;
+    for (var i = 0; i < 3; i++)
+        r.lastIndex = 0;          // call a setter
+    var s = ';';
+    try {
+        for (i = 0; i < 80; i++)
+            s += s;                   // call js_CanLeaveTrace
+    } catch (exc) {
+        return "ok";
+    }
+}
+assertEq(testBug507425(), "ok");