6796 2006-01-25 11:03:13 -0800 Reproducible CSS Crasher (infinite recursion adding/removing scrollbar) 2007-04-28 22:31:17 -0700 1 1 1 Unclassified WebKit Layout and Rendering 417.x Mac OS X 10.4 RESOLVED FIXED HasReduction, InRadar P1 Normal --- 1 eric bdakin bdakin hyatt joost mitz mjs samuel.sidler webkitBugzilla oldest_to_newest 29870 0 eric 2006-01-25 11:03:13 -0800 Simple reduction attached. Also here: <style> body{ font-size:11px; line-height:127% } div{ float:left; overflow:auto } div label{ float:left; font-size:110% } div span{ float:right; } </style> <div> <label>foo</label> <span>bar</span> </div> 29871 1 5952 eric 2006-01-25 11:03:38 -0800 Created attachment 5952 Simple Test Case (causes crash) 29872 2 eric 2006-01-25 11:04:06 -0800 This is in Radar as <rdar://problem/4406377> 29873 3 eric 2006-01-25 11:11:04 -0800 Crash Report: It's a recursive loop. We're blowing out the stack. Exception: EXC_BAD_ACCESS (0x0001) Codes: KERN_INVALID_ADDRESS (0x0001) at 0xbf7ffff0 Thread 0 Crashed: 0 com.apple.CoreFoundation 0x90740b80 CFRetain + 24 1 com.apple.CoreFoundation 0x907405c0 _CFArrayReplaceValues + 372 2 com.apple.CoreFoundation 0x90740438 CFArrayAppendValue + 200 3 com.apple.AppKit 0x93695748 -[NSView _addSubview:] + 124 4 com.apple.AppKit 0x936949f0 -[NSView _setSuperview:] + 320 5 com.apple.AppKit 0x936954f0 -[NSView addSubview:] + 352 6 com.apple.WebKit 0x0127bac4 -[WebHTMLView addSubview:] + 96 (WebHTMLView.m:2237) 7 com.apple.WebCore 0x01d025ec QWidget::addToSuperview(NSView*) + 532 (KWQWidget.mm:530) 8 com.apple.WebCore 0x01cdfdb8 QScrollView::addChild(QWidget*, int, int) + 528 (KWQScrollView.mm:360) 9 com.apple.WebCore 0x02009d00 WebCore::RenderLayer::setHasVerticalScrollbar(bool) + 196 (render_layer.cpp:743) 10 com.apple.WebCore 0x0200a1b8 WebCore::RenderLayer::updateScrollInfoAfterLayout() + 856 (render_layer.cpp:883) 11 com.apple.WebCore 0x01fd3b6c WebCore::RenderBlock::layoutBlock(bool) + 3648 (RenderBlock.cpp:546) 12 com.apple.WebCore 0x0200a2cc WebCore::RenderLayer::updateScrollInfoAfterLayout() + 1132 (render_layer.cpp:893) 13 com.apple.WebCore 0x01fd3b6c WebCore::RenderBlock::layoutBlock(bool) + 3648 (RenderBlock.cpp:546) 14 com.apple.WebCore 0x0200a2cc WebCore::RenderLayer::updateScrollInfoAfterLayout() + 1132 (render_layer.cpp:893) 15 com.apple.WebCore 0x01fd3b6c WebCore::RenderBlock::layoutBlock(bool) + 3648 (RenderBlock.cpp:546) 16 com.apple.WebCore 0x0200a2cc WebCore::RenderLayer::updateScrollInfoAfterLayout() + 1132 (render_layer.cpp:893) 17 com.apple.WebCore 0x01fd3b6c WebCore::RenderBlock::layoutBlock(bool) + 3648 (RenderBlock.cpp:546) 18 com.apple.WebCore 0x0200a2cc WebCore::RenderLayer::updateScrollInfoAfterLayout() + 1132 (render_layer.cpp:893) 19 com.apple.WebCore 0x01fd3b6c WebCore::RenderBlock::layoutBlock(bool) + 3648 (RenderBlock.cpp:546) 20 com.apple.WebCore 0x0200a2cc WebCore::RenderLayer::updateScrollInfoAfterLayout() + 1132 (render_layer.cpp:893) 21 com.apple.WebCore 0x01fd3b6c WebCore::RenderBlock::layoutBlock(bool) + 3648 (RenderBlock.cpp:546) 22 com.apple.WebCore 0x0200a2cc WebCore::RenderLayer::updateScrollInfoAfterLayout() + 1132 (render_layer.cpp:893) 29880 4 5953 joost 2006-01-25 11:23:33 -0800 Created attachment 5953 Reduced Testcase Reduced it a bit more. Reducing the line-height percentage or font-size more, keeps the crash from occurring. 29919 5 mitz 2006-01-25 15:08:57 -0800 The <label>, which is a float, has height 19 and overflow height 20. The <div> grows to contain only 19 pixels, at which point it decides that it needs a vertical scrollbar. That leaves not enough room for the <span>, which makes it move to the next line, but then, the float's height discrepancy is no longer an issue, the <div> no longer needs that scrollbar, the <span> can move up again, and on and on it goes... I think the problem is right there at the beginning, when the <div> uses the FloatingObject's endY, which is based on height, rather than something that takes overflow height into account. Still no idea what to fix, let alone how. 29920 6 eric 2006-01-25 15:11:13 -0800 We need some hyatt here. 29933 7 mitz 2006-01-25 15:55:01 -0800 My last comment was wrong. Checking with Firefox, it looks like there shouldn't be a vertical scrollbar in the first place. 35427 8 darin 2006-03-07 09:01:10 -0800 *** Bug 7631 has been marked as a duplicate of this bug. *** 35428 9 darin 2006-03-07 09:01:47 -0800 Another test case in bug 7631. Lets make sure both of these test cases are fixed. 35846 10 7001 bdakin 2006-03-10 20:10:36 -0800 Created attachment 7001 First attempt at halting infinte recursion I am not sure if this is exactly right, but it fixes the test case and doesn't break any layout tests. Thoughts? 35878 11 mjs 2006-03-11 02:09:13 -0800 Looks good to me. Make sure to try both test cases, and to add them as layout tests. I'll give hyatt a chance to give it the once over. 36146 12 7001 hyatt 2006-03-13 14:20:51 -0800 Comment on attachment 7001 First attempt at halting infinte recursion Move the variables into RenderLayer and try to keep as much of the scrolling logic there as you can. I'd try to make the min/max width modification only be done if the infinite recursion case was hit. I think it would also be fine to simply not have this code in an initial check-in as well. 36155 13 7053 bdakin 2006-03-13 16:34:42 -0800 Created attachment 7053 New patch After talking with Hyatt, I decided not to mess with the min and max width in this check-in. Here is a new patch! 36158 14 7053 darin 2006-03-13 16:58:27 -0800 Comment on attachment 7053 New patch There's one major thing I don't understand: When does anything ever reset sawHorizontalBar or sawVerticalBar back to false? What happens if the content get smaller and doesn't need a horizontal scrollbar any more? Does the layer get destroyed and re-created in that case? + bool sawHorizontalBar() { return m_sawHorizontalBar; } + bool sawVerticalBar() { return m_sawVerticalBar; } Those should be const member functions. + if (needHorizontalBar) + setSawHorizontalBar(needHorizontalBar); Could just be setSawHorizontalBar(true); + if (needVerticalBar) + setSawVerticalBar(needVerticalBar); Same here. 36159 15 7053 hyatt 2006-03-13 17:13:35 -0800 Comment on attachment 7053 New patch r=me. Make sure to run layout tests before landing (and to add a layout test for this problem). 36160 16 7053 hyatt 2006-03-13 17:17:15 -0800 Comment on attachment 7053 New patch Yeah, Darin is right. I have an idea for how this can be adjusted. 36161 17 hyatt 2006-03-13 17:20:46 -0800 I think you can put a guard around the spot in RenderLayer that does a re-layout when overflow is AUTO. A single bit re-entrancy guard on the layer should do it. 36318 18 7062 bdakin 2006-03-14 14:00:58 -0800 Created attachment 7062 Single-bit guard around layoutBlock() call Like this, Dave? In the specific test case for this bug, this patch prevents the crash but yields a nasty layout. "foobar" is on one line and a scroll bar is drawn over most of the "bar" as if "foo" and "bar" were stacked. It is worth noting, though, that some of the other sites that we know of that crash in this same way (like the one in the bug that is marked as a dup of this bugzilla) no longer crash with this patch and lay out just fine. 36319 19 7063 bdakin 2006-03-14 14:15:40 -0800 Created attachment 7063 no this one! Okay, newer patch with some Hyatt-comments from IRC taken into account. This one doesn't yield a nasty layout either. yay! 36320 20 7063 hyatt 2006-03-14 14:18:58 -0800 Comment on attachment 7063 no this one! r=me, be sure to file a followup bug about possibly adjusting min/maxwidth. 36337 21 bdakin 2006-03-14 16:03:57 -0800 I filed http://bugzilla.opendarwin.org/show_bug.cgi?id=7768 to represent the min/max_width problem. 40541 22 webkitBugzilla 2006-04-26 15:42:20 -0700 Has this been merged into the Safari-2-0 branch, given that this crash also occurs in Safari 2.0.3? 22758 23 mitz 2007-02-19 23:16:55 -0800 *** Bug 12679 has been marked as a duplicate of this bug. *** 11767 24 mitz 2007-04-28 22:31:17 -0700 *** Bug 13536 has been marked as a duplicate of this bug. *** 5952 2006-01-25 11:03:38 -0800 2006-01-25 11:23:33 -0800 Simple Test Case (causes crash) repro-crash.html text/html 242 eric PHN0eWxlPgpib2R5ewogICAgZm9udC1zaXplOjExcHg7CiAgICBsaW5lLWhlaWdodDoxMjclCn0K ZGl2ewogICAgZmxvYXQ6bGVmdDsKICAgIG92ZXJmbG93OmF1dG8KfQpkaXYgbGFiZWx7CiAgICBm 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