37954 2010-04-21 14:52:10 -0700 Occasional crash in CoreGraphics when using accelerated compositing in Windows. 2010-04-22 08:14:24 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) PC Windows XP RESOLVED FIXED InRadar P2 Critical --- 37952 1 aestes aestes oldest_to_newest 215514 0 aestes 2010-04-21 14:52:10 -0700 When viewing pages rendered in accelerated compositing mode using the Windows port, there is occasionally a crash in the underlying CoreGraphics library used by WebKit on Windows. Methods to repeat the crash include resizing the browser window, repeatedly changing focus between the browser and another application, and dragging items into the WebView. The crash appears to be intermittent. 215515 1 aestes 2010-04-21 14:52:33 -0700 <rdar://problem/7806666> 215517 2 aestes 2010-04-21 14:54:33 -0700 Diagnosis from Steve Falkenburg: This CGDataProviderRef pulls its data from m_backingStoreBitmap. Note this is deleted on a timer after a period of inactivity. I'm thinking this may be the cause of the bug. If the m_backingStoreBitmap is freed and then the WKCACFLayerRenderer::renderTimerFired(Timer<WKCACFLayerRenderer>*) timer fires, we will crash. One possible easy fix would be to protect the call to deleteBackingStoreSoon() if isAcceleratedCompositing() returns true in WebView::paint(). I haven't tested this theory (or fix). 215678 3 54020 aestes 2010-04-21 20:56:49 -0700 Created attachment 54020 patch 215679 4 aestes 2010-04-21 21:02:57 -0700 Here is a description of a solution from Adam Roben, which is what I implemented in the patch: I mentioned to Steve that one way to fix the problem with deleteBackingStoreSoon() is to add a RefCounted wrapper around an HBITMAP, and use that to hold the WebView's backing store bitmap. Then we can ref that wrapper object in updateRootLayerContents and call CGDataProviderCreateWithData (not CreateWithCFData), passing the wrapper object as the info pointer and a function that just calls deref() on the wrapper as the release callback. That should allow the bitmap to live as long as the CGImageRef needs it. 215739 5 54020 mjs 2010-04-21 23:51:30 -0700 Comment on attachment 54020 patch r=me Nice fix. 215746 6 aestes 2010-04-22 00:13:09 -0700 Committed revision 58067. Thanks Maciej! 215881 7 54020 aroben 2010-04-22 08:14:24 -0700 Comment on attachment 54020 patch Nice fix! 54020 2010-04-21 20:56:49 -0700 2010-04-22 08:14:24 -0700 patch 37954.patch text/plain 8492 aestes SW5kZXg6IFdlYktpdC93aW4vQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYktpdC93aW4vQ2hh bmdlTG9nCShyZXZpc2lvbiA1ODA0NikKKysrIFdlYktpdC93aW4vQ2hhbmdlTG9nCSh3b3JraW5n IGNvcHkpCkBAIC0xLDMgKzEsMjggQEAKKzIwMTAtMDQtMjEgIEFuZHkgRXN0ZXMgIDxhZXN0ZXNA YXBwbGUuY29tPgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAg ICAgIFJlZmVyZW5jZSBjb3VudCBXZWJWaWV3J3MgYmFja2luZyBzdG9yZSBiaXRtYXAgdG8gcHJl dmVudAorICAgICAgICBkZWxldGVCYWNraW5nU3RvcmUoKSBmcm9tIGZyZWVpbmcgdGhlIGJpdG1h cCB3aGlsZSBpdCBpcyBzdGlsbCBiZWluZworICAgICAgICByZWZlcmVuY2VkIGJ5IENvcmUgQW5p bWF0aW9uLgorCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9p ZD0zNzk1NAorCisgICAgICAgICogV2ViVmlldy5jcHA6CisgICAgICAgIChXZWJWaWV3OjplbnN1 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