26568 2009-06-19 23:34:51 -0700 Repro crash animating GIF if previously used in a closed window's back/forward list 2009-06-21 16:15:43 -0700 1 1 1 Unclassified WebKit Platform 528+ (Nightly build) All Windows Vista RESOLVED FIXED InRadar P2 Normal --- 1 alice.barraclough alice.barraclough darin mitz sfalken oldest_to_newest 127110 0 alice.barraclough 2009-06-19 23:34:51 -0700 <rdar://problem/6978362> This bug reproduces in Safari 4 on Windows but not on Mac because on Mac we execute the platformWidget() code paths instead of calling hostWindow(). Steps to repro: - Safari 4 on any Windows platform - Set Safari to open new windows with an empty page - Launch - Open 2 empty windows - Navigate to http://www.forum.skoda-club.ru/viewtopic.php?t=38976&postdays=0&postorder=asc&start=15&sid=9d258270773fafd77a27418fb1c8180b - Navigate in *same* window to about:blank - close window w/ about:blank - *QUICKLY* load in second window: http://www.forum.skoda-club.ru/viewtopic.php?t=38976&postdays=0&postorder=asc&start=15&sid=9d258270773fafd77a27418fb1c8180b ---> crash We delay destruction of the back/forward list, so a cached image can be left with a reference to a client that has a null page. STACK_TEXT: 0018d2f0 6cc29352 0018d3d0 00000000 7df1f704 WebKit!WebCore::ScrollView::repaintContentRectangle+0x2f 0018d358 6cd66586 0018d3d0 00000000 7df1f704 WebKit!WebCore::FrameView::repaintContentRectangle+0x1f2 0018d398 6cbd1319 0018d3d0 00000000 6cbd1413 WebKit!WebCore::RenderView::repaintViewRectangle+0x66 0018d3a4 6cbd1413 7df1f704 0018d3d0 00000000 WebKit!WebCore::RenderObject::repaintUsingContainer+0x39 0018d3e0 6ce2df04 0018d408 00000000 7e1afa80 WebKit!WebCore::RenderObject::repaintRectangle+0x93 0018d480 6ce2bbae 7e1afa80 00000000 7f0276e8 WebKit!WebCore::RenderImage::imageChanged+0x2c4 0018d4a8 6ce2c0b7 00000000 00000001 6ceb9e6c WebKit!WebCore::CachedImage::notifyObservers+0x2e 0018d4b4 6ceb9e6c 7f0276e8 0018f5b8 7f0276e8 WebKit!WebCore::CachedImage::animationAdvanced+0x17 0018d52c 6cebfcfb 00000001 0018f5b8 7f0276e8 WebKit!WebCore::BitmapImage::startAnimation+0x26c 0018d598 6cc46180 0018f5b8 0018d5e0 0018d5d0 WebKit!WebCore::BitmapImage::draw+0x1b 0018d5f0 6cc45c01 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-0700 Comment on attachment 31588 patch and manual test The null checks are good in preventing crashes, but I wonder if it isn’t practical to augment them with ASSERTs, and to add code at a higher level that would stop this crash from happening—one possible place is RenderView::repaintViewRectangle(), but even better would be to change implementations of imageChanged() such that they don’t do any unnecessary work (such as computing a repaint rectangle) when the document is in the back/forward cache. 127151 3 31588 mjs 2009-06-20 12:07:01 -0700 Comment on attachment 31588 patch and manual test I'm going to r+ notwithstanding Mitz's comments, because I think further improvement to fix the problem at a higher level can be done as a separate patch. Is it possible to make an automated layout test for this? I believe layout tests have the power to open and navigate additional windows. Let's try to make the test into a fully automated LayoutTest if possible. 127187 4 alice.barraclough 2009-06-20 21:20:48 -0700 The crash requires that the back/forward cache be enabled, which afaik is not enabled in the automated layout tests. 127259 5 mitz 2009-06-21 16:15:43 -0700 Fixed by Alice in <http://trac.webkit.org/changeset/44908>. 31588 2009-06-19 23:36:57 -0700 2009-06-20 12:07:01 -0700 patch and manual test patch6978362.txt text/plain 9071 alice.barraclough SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYkNvcmUvQ2hhbmdlTG9n CShyZXZpc2lvbiA0NDg4OSkKKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBA IC0xLDMgKzEsMjIgQEAKKzIwMDktMDYtMTkgIEFsaWNlIExpdSAgPGFsaWNlLmxpdUBhcHBsZS5j b20+CisKKyAgICAgICAgRml4IGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9p ZD0yNjU2OCAKKyAgICAgICAgUmVwcm8gY3Jhc2ggYW5pbWF0aW5nIEdJRiBpZiBwcmV2aW91c2x5 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