84908 2012-04-25 16:55:42 -0700 REGRESSION(r113086): onresize event handler can be deleted in popup window 2012-04-30 10:46:24 -0700 1 1 1 Unclassified WebKit WebCore JavaScript 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P1 Critical --- 85208 1 haraken haraken abarth ap arv ggaren japhet levin ojan webkit.review.bot oldest_to_newest 610167 0 haraken 2012-04-25 16:55:42 -0700 In a nutshell, an onresize event handler in the popup window can be non-deterministically deleted. For more details, please look at the chromium issue 123642: http://code.google.com/p/chromium/issues/detail?id=123642 I confirmed that this is the regression caused by r113086. 610168 1 138900 haraken 2012-04-25 16:56:31 -0700 Created attachment 138900 Patch 610170 2 haraken 2012-04-25 16:57:35 -0700 The Chromium bug is marked as ReleaseBlock-Stable. I am happy if I could get a review quickly:) 610179 3 138900 arv 2012-04-25 17:07:13 -0700 Comment on attachment 138900 Patch How does this work in JSC? Can we add a test please? 610190 4 haraken 2012-04-25 17:12:50 -0700 (In reply to comment #3) > (From update of attachment 138900 [details]) > How does this work in JSC? JSC works fine. r113086 has changed the V8 bindings only. > Can we add a test please? As I explained in the ChangeLog, I couldn't make the DRT test case. For example, I wrote a test case like this, but could not reproduce it: <body onclick="f()"> <script> function gc() { ... } function f() { document.body.innerHTML += "onclick!<br>"; gc(); } </script> </body> I tried other test cases, but it seems that we cannot reproduce the bug in the main window. It just happens in the popup window, as far as I observed. Also the latency to load the HTML seems to be important. The bug happens only when we load the HTML from the disk. Do you have any idea? 610290 5 arv 2012-04-25 18:50:26 -0700 (In reply to comment #4) > (In reply to comment #3) > > (From update of attachment 138900 [details] [details]) > > How does this work in JSC? > > JSC works fine. r113086 has changed the V8 bindings only. Yes, but JSC also clears out these strings. Do they keep their listener object alive where we do not? > > Can we add a test please? > > As I explained in the ChangeLog, I couldn't make the DRT test case. For example, I wrote a test case like this, but could not reproduce it: > > <body onclick="f()"> > <script> > function gc() { ... } > function f() { document.body.innerHTML += "onclick!<br>"; gc(); } > </script> > </body> > > I tried other test cases, but it seems that we cannot reproduce the bug in the main window. It just happens in the popup window, as far as I observed. Also the latency to load the HTML seems to be important. The bug happens only when we load the HTML from the disk. Do you have any idea? I'll try a few things 610721 6 haraken 2012-04-26 10:41:56 -0700 (In reply to comment #5) > > JSC works fine. r113086 has changed the V8 bindings only. > > Yes, but JSC also clears out these strings. Do they keep their listener object alive where we do not? I don't know but I think > Do they keep their listener object alive where we do not? ^^^ this is possible. The timing of when JSC/V8 calls back weakCallback() seems completely different between JSC and V8. Though I am not understanding JSC's GC much enough to explain the details... Anyway the bug depends on the timing of when the listener object gets weaken by GC, which _can_ be different between JSC and V8. I hope we could make some test cases to convince it... 610727 7 haraken 2012-04-26 10:51:02 -0700 I agree that (1) we should fix V8's GC about when weakEventListenerCallback() is called and that (2) we want a test case. But personally I think that landing the uploaded patch would be acceptable: - This bug is causing serious problem in full-screen apps in Chromium. The Chromium issue is marked as P1 and Release-block-stable. - The patch just changes the listener object to keep data until the listener object is reclaimed. This won't cause any memory leak. ojan, levin, arv: any idea? 610734 8 arv 2012-04-26 10:56:02 -0700 I was hammering on this last night for an hour or so and I could not reproduce the behavior. If we have a repro it should be easier to figure out why this happens. 610735 9 haraken 2012-04-26 10:59:31 -0700 (In reply to comment #8) > I was hammering on this last night for an hour or so and I could not reproduce the behavior. I can reproduce it by following the steps in http://code.google.com/p/chromium/issues/detail?id=123642 > If we have a repro it should be easier to figure out why this happens. I described what is happening in the ChangeLog. The problem is that we do not know why V8's GC calls back weakEventListenerObject(), even if onresize="f()" is still registered to the <body> tag. 610736 10 arv 2012-04-26 10:59:54 -0700 (In reply to comment #8) > I was hammering on this last night for an hour or so and I could not reproduce the behavior. If we have a repro it should be easier to figure out why this happens. I'm stupid. I should have tried the attachments. innerHTML += strikes again! 611085 11 haraken 2012-04-26 16:49:40 -0700 As far as I've tried, I could not reproduce the bug in the main window... It does happen in popup window only, which is not testable. 611105 12 arv 2012-04-26 17:12:41 -0700 Popups are testable but I suspect chromium DRT is doing something different because when I do exactly the same thing in DRT it works. 611112 13 139102 haraken 2012-04-26 17:19:55 -0700 Created attachment 139102 Rebased patch 611597 14 139102 arv 2012-04-27 09:47:02 -0700 Comment on attachment 139102 Rebased patch View in context: https://bugs.webkit.org/attachment.cgi?id=139102&action=review This solution does not seem right. Why are we calling listener->disposeListenerObject() when the listener object should be kept alive? > Source/WebCore/ChangeLog:-29520 > -2012-04-03 Erik Arvidsson <arv@chromium.org> Why are you removing this? 611604 15 haraken 2012-04-27 09:53:29 -0700 (In reply to comment #14) > This solution does not seem right. Why are we calling listener->disposeListenerObject() when the listener object should be kept alive? Rather, the problem would be the fact that weakEventListenerCallback() is called by V8's GC. (It is reasonable to call listener->disposeListenerObject() given that weakEventListenerCallback() is call backed.) Maybe we are forgetting to add some hidden reference (or something like that) to the listener object? I think - the right fix would be to make V8's GC not call back weakEventListenerCallback() when the listener object should be kept alive. - if it will take a long time to make the right fix, it would be acceptable to land the patch for now since the patch will be harmless. > > Source/WebCore/ChangeLog:-29520 > > -2012-04-03 Erik Arvidsson <arv@chromium.org> > > Why are you removing this? Sorry, will fix. 611620 16 139222 haraken 2012-04-27 10:10:20 -0700 Created attachment 139222 Patch 612098 17 139222 ojan 2012-04-27 19:39:57 -0700 Comment on attachment 139222 Patch This is fine for now to fix the regression. We really should fix this if we can though. In the meantime, can you add an assert and a FIXME (as well as file a bug)? 612230 18 haraken 2012-04-28 03:41:39 -0700 (In reply to comment #17) > (From update of attachment 139222 [details]) > This is fine for now to fix the regression. We really should fix this if we can though. In the meantime, can you add an assert and a FIXME (as well as file a bug)? ojan: Thanks! I'll file a bug and add a FIXME. But do you have any idea to insert ASSERT? (We might not want to introduce a new member variable just to count how many times prepareListenerObject() is called...) 612352 19 ojan 2012-04-28 17:34:19 -0700 (In reply to comment #18) > (In reply to comment #17) > > (From update of attachment 139222 [details] [details]) > > This is fine for now to fix the regression. We really should fix this if we can though. In the meantime, can you add an assert and a FIXME (as well as file a bug)? > > ojan: Thanks! I'll file a bug and add a FIXME. But do you have any idea to insert ASSERT? (We might not want to introduce a new member variable just to count how many times prepareListenerObject() is called...) We could add it just for debug? 612397 20 139392 haraken 2012-04-28 23:21:24 -0700 Created attachment 139392 patch for landing 612410 21 139392 webkit.review.bot 2012-04-29 01:07:08 -0700 Comment on attachment 139392 patch for landing Clearing flags on attachment: 139392 Committed r115594: <http://trac.webkit.org/changeset/115594> 138900 2012-04-25 16:56:31 -0700 2012-04-26 17:19:51 -0700 Patch bug-84908-20120425165630.patch text/plain 4003 haraken U3VidmVyc2lvbiBSZXZpc2lvbjogMTE1MDc4CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZGE5MzUyY2IxYzE4N2Mx ZmZhYzNhZmZlMzFlODk2ZWY1NmFiNWM4NS4uOTZiYjYyNDRiYzliM2U5ZTFiMWVjZjU0YzBhNTlj Y2RhZWQzMmZmZiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDY2IEBACisyMDEyLTA0LTI1ICBLZW50 YXJvIEhhcmEgIDxoYXJha2VuQGNocm9taXVtLm9yZz4KKworICAgICAgICBSRUdSRVNTSU9OKHIx MTMwODYpOiBvbnJlc2l6ZSBldmVudCBoYW5kbGVyIGNhbiBiZSBkZWxldGVkIGluIHBvcHVwIHdp 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