24449 2009-03-07 22:04:58 -0800 Bubble Spinner game page crashes 2009-03-09 02:35:47 -0700 1 1 1 Unclassified WebKit Page Loading 528+ (Nightly build) Mac OS X 10.5 RESOLVED DUPLICATE 23736 http://www.addictinggames.com/bubblespinner.html HasReduction, InRadar P1 Normal --- 1 zwarich zwarich ap mrowe oldest_to_newest 112749 0 zwarich 2009-03-07 22:04:58 -0800 The page <http://www.addictinggames.com/bubblespinner.html> crashes with wildly different backtraces. It has nothing to do with playing the game, and some say it even happens with a "Click to Flash" input manager hack. 112750 1 zwarich 2009-03-07 22:08:26 -0800 This also crashes with plugins disabled. 112751 2 zwarich 2009-03-07 22:20:56 -0800 I can reproduce with a local copy and <base href=...>, so I should be able to make a reduction. It seems to crash a lot in DocLoader::setLoadInprogress() under Loader::Host::didFinishLoading() trying to get the Frame of a null document. 112752 3 zwarich 2009-03-07 22:28:25 -0800 The problem seems to be due to this piece of JS, because it goes away if I delete it: $(function() { setTimeout('update_ad_iframe("iframe3","http://ad.doubleclick.net/adj/ag.nol/puzzlesboards/runofsection_puzzlesboards;gw=puzzlesboards;sec_0=runofsection_puzzlesboards;!category=expand;u|gw-puzzlesboards|sec_0-runofsection_puzzlesboards|;",4,160,600,10 * 60 * 1000,"no")',1600); }); I imagine something is going wrong with loading the new content in the ad iframe. 112754 4 28396 zwarich 2009-03-07 22:55:25 -0800 Created attachment 28396 Partial reduction This is a small reduction, but it still uses the JS libraries on their site. The problem is caused by them having two timers to update the iframe set to the same timeout (presumedly due to undesirable code duplication on their part). These timers are made at different times during parsing, so they are a bit apart. It seems that canceling the request caused by the first timer and processing the request caused by the second timer. Presumedly, the crash is caused by using objects from the first partially completed load when processing the second load, but I am not sure. I make this crash consistently for me by opening it up in a bunch of new tabs. Usually when I get to 4 or 5 it will crash. 112756 5 28398 zwarich 2009-03-07 23:16:14 -0800 Created attachment 28398 Assertion failure stack trace I was waiting on a fresh debug build. It turns out my reduction consistently causes an assertion failure. 112758 6 28400 zwarich 2009-03-08 00:18:03 -0800 Created attachment 28400 Reduction Here is a simple reduction for the assertion failure. It still loads some content from the network, but it is not much and is essential to the reduction. There is no problem with setting the src of an iframe in quick succession with timers. However, when it is done using a javascript: URL that returns a constant string for the source of the iframe that then references a script file over the network, it causes the assertion failure. I don't really understand why, but I will look into it. 112761 7 mrowe 2009-03-08 00:25:26 -0800 <rdar://problem/6658053> 112763 8 28401 zwarich 2009-03-08 00:37:17 -0800 Created attachment 28401 Simpler reduction Here is a simpler reduction involving only one external resource, the SquirrelFish PNG. ;-) 112764 9 28401 zwarich 2009-03-08 00:47:52 -0800 Comment on attachment 28401 Simpler reduction Strange, this simpler reduction no longer works for me. 112766 10 zwarich 2009-03-08 01:52:52 -0800 The problem is that loading a JS URL doesn't cancel pending requests. Adding a call to stopLoading() in FrameLoader::executeIfJavaScriptURL() fixes the bug, because of this section of code in stopLoading(): cache()->loader()->cancelRequests(docLoader); However, this is probably not the right change. Hopefully someone more familiar with FrameLoader can let me know what to do here. 112771 11 28404 zwarich 2009-03-08 03:17:09 -0700 Created attachment 28404 Proposed patch Here's a patch that fixes the problem. It uses stopAllLoaders(), because that seems to be what is used in this situation. I am confident that I can make a DRT HTTP test that reproduces this bug, but it might take me a while, so I am putting the patch up for review first. 112772 12 28404 zwarich 2009-03-08 03:17:58 -0700 Comment on attachment 28404 Proposed patch Doh. I posted my old diff. ;-) 112773 13 28405 zwarich 2009-03-08 03:18:33 -0700 Created attachment 28405 Revised proposed patch 112808 14 ap 2009-03-09 02:19:59 -0700 See also: bug 23736 (duplicate?) The fix looks reasonable, but it's no good without a test. 112810 15 zwarich 2009-03-09 02:35:13 -0700 I am marking this a dupe of bug 23736, because my patch here also fixes that bug and the discussion there is both longer and involving more people. *** This bug has been marked as a duplicate of 23736 *** 112812 16 28405 zwarich 2009-03-09 02:35:47 -0700 Comment on attachment 28405 Revised proposed patch Clearing review because it would be confusing on a dupe. 28396 2009-03-07 22:55:25 -0800 2009-03-08 00:18:03 -0800 Partial reduction reduction.html text/html 1042 zwarich PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KPHNjcmlwdCB0eXBlPSJ0ZXh0L2phdmFzY3Jp cHQiIHNyYz0iaHR0cDovL3d3dy5hZGRpY3RpbmdnYW1lcy5jb20vc3RhdGljL2pxdWVyeS9saWIv anF1ZXJ5LTEuMi42LnBhY2suanMiPjwvc2NyaXB0Pgo8c2NyaXB0IHR5cGU9InRleHQvamF2YXNj cmlwdCIgc3JjPSJodHRwOi8vd3d3LmFkZGljdGluZ2dhbWVzLmNvbS9zdGF0aWMvanF1ZXJ5L2xp Yi9qcXVlcnkuYnJvd3Nlci5taW4uanMiPjwvc2NyaXB0Pgo8c2NyaXB0IHR5cGU9InRleHQvamF2 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