third_party/WebKit/LayoutTests/fast/loader/recursive-before-unload-crash.html

   1 <script>
   2 if (window.testRunner) {
   3     testRunner.waitUntilDone();
   4     testRunner.dumpAsText();
   5 }
   6
   7 var haveAddedIFrame = false;
   8
   9 window.onbeforeunload = function() {
  10     if (!haveAddedIFrame)
  11         alert("onbeforeunload called, and iframe hasn't been added yet.");
  12     var a = document.createEvent("MouseEvents");
  13     a.initEvent("click", true, true);
  14     var d = document.createElement("a");
  15     d.href = "http://localhost:1234/";
  16     d.dispatchEvent(a);
  17 }
  18
  19 function clicked() {
  20     window.location.href="http://127.0.0.1:1234/";
  21 }
  22
  23 function addiframe() {
  24     alert("Adding iframe");
  25     var frame = document.createElement("iframe");
  26     frame.src = "http://localhost:1234/"
  27     document.body.appendChild(frame);
  28     haveAddedIFrame = true;
  29     if (window.testRunner)
  30         testRunner.notifyDone();
  31 }
  32
  33 function runTest() {
  34    clicked();
  35    setTimeout("addiframe();", 0);
  36 }
  37
  38 </script>
  39 <body onload="runTest();">
  40 This test demonstrates a problem with our handling of the beforeunload event.<br>
  41 If a script manages to try and navigate the frame from beforeunload - when a navigation is already pending - we end up blowing out the stack by recursively consulting the policy delegate then running onbeforeunload repeatedly.<br>
  42 After this happens, the FrameLoader is in a bogus state where it thinks it is in the middle of a provisional load, but it doesn't have a provisional document loader.<br>
  43 In this state, the frame is very difficult to navigate anywhere else, and attempts to load new things within the frame can result in a crash.<br>
  44 This was reproducibly identified on sears.com following a bizarre Safari specific code path.<br>
  45 <a href="javascript:void(clicked())">Click here to run the beforeunload test and blow out the stack</a><br>
  46 <a href="javascript:void(addiframe())">Click here to append an iframe and crash</a><br>
  47 </body>