199613 2019-07-09 03:12:50 -0700 REGRESSION(r244906): Crash in WebCore::positionOffsetValue 2019-07-09 11:38:54 -0700 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 koivisto webkit-unassigned commit-queue simon.fraser zalan oldest_to_newest 1551180 0 koivisto 2019-07-09 03:12:50 -0700 Thread[0] EXC_BAD_ACCESS (SIGSEGV) (KERN_INVALID_ADDRESS at 0x0000000000000030) [ 0] 0x00007fff3f970006 WebCore`WebCore::positionOffsetValue(WebCore::RenderStyle const&, WebCore::CSSPropertyID, WebCore::RenderObject*) [inlined] WebCore::RenderObject::RenderObjectBitfields::horizontalWritingMode() const at RenderObject.h:935:9 931 ADD_BOOLEAN_BITFIELD(isBox, IsBox); 932 ADD_BOOLEAN_BITFIELD(isInline, IsInline); 933 ADD_BOOLEAN_BITFIELD(isReplaced, IsReplaced); 934 ADD_BOOLEAN_BITFIELD(isLineBreak, IsLineBreak); -> 935 ADD_BOOLEAN_BITFIELD(horizontalWritingMode, HorizontalWritingMode); 936 937 ADD_BOOLEAN_BITFIELD(hasLayer, HasLayer); 938 ADD_BOOLEAN_BITFIELD(hasOverflowClip, HasOverflowClip); // Set in the case of overflow:auto/scroll/hidden 939 ADD_BOOLEAN_BITFIELD(hasTransformRelatedProperty, HasTransformRelatedProperty); 0x00007fff3f96fffb: je 0x1166006 ; <+534> [inlined] WebCore::RenderObject::RenderObjectBitfields::horizontalWritingMode() const at RenderObject.h:443 0x00007fff3f96fffd: testb $0x2, 0x32(%rax) 0x00007fff3f970001: je 0x1165ff0 ; <+512> [inlined] WebCore::RenderBox::enclosingScrollportBox() const + 25 at CSSComputedStyleDeclaration.cpp:794 0x00007fff3f970003: movq %rax, %rbx -> 0x00007fff3f970006: movl 0x30(%rbx), %ecx 0x00007fff3f970009: shrl $0xf, %ecx 0x00007fff3f97000c: andl $0x1, %ecx 0x00007fff3f97000f: movzwl 0x8c(%rbx), %eax 0x00007fff3f970016: cmpl %ecx, %r15d [ 0] 0x00007fff3f970006 WebCore`WebCore::positionOffsetValue(WebCore::RenderStyle const&, WebCore::CSSPropertyID, WebCore::RenderObject*) [inlined] WebCore::RenderObject::isHorizontalWritingMode() const at RenderObject.h:443 439 bool isBox() const { return m_bitfields.isBox(); } 440 bool isRenderView() const { return m_bitfields.isBox() && m_bitfields.isTextOrRenderView(); } 441 bool isInline() const { return m_bitfields.isInline(); } // inline object 442 bool isReplaced() const { return m_bitfields.isReplaced(); } // a "replaced" element (see CSS) -> 443 bool isHorizontalWritingMode() const { return m_bitfields.horizontalWritingMode(); } 444 445 bool isDragging() const { return m_bitfields.hasRareData() && rareData().isDragging(); } 446 bool hasReflection() const { return m_bitfields.hasRareData() && rareData().hasReflection(); } 447 bool isRenderFragmentedFlow() const { return m_bitfields.hasRareData() && rareData().isRenderFragmentedFlow(); } [ 0] 0x00007fff3f970006 WebCore`WebCore::positionOffsetValue(WebCore::RenderStyle const&, WebCore::CSSPropertyID, WebCore::RenderObject*) + 534 at CSSComputedStyleDeclaration.cpp:795 791 LayoutUnit containingBlockSize; 792 if (box.isStickilyPositioned()) { 793 const RenderBox& enclosingScrollportBox = 794 box.enclosingScrollportBox(); -> 795 if (isVerticalProperty == enclosingScrollportBox.isHorizontalWritingMode()) 796 containingBlockSize = enclosingScrollportBox.contentLogicalHeight(); 797 else 798 containingBlockSize = enclosingScrollportBox.contentLogicalWidth(); 799 } else { [ 1] 0x00007fff3f9629d2 WebCore`WebCore::ComputedStyleExtractor::valueForPropertyinStyle(WebCore::RenderStyle const&, WebCore::CSSPropertyID, WebCore::RenderElement*) + 24466 at CSSComputedStyleDeclaration.cpp:0 1 /* 2 * Copyright (C) 2004 Zack Rusin <zack@kde.org> 3 * Copyright (C) 2004-2017 Apple Inc. All rights reserved. 4 * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org> 5 * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com> 6 * Copyright (C) 2011 Sencha, Inc. All rights reserved. 7 * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved. 8 * 9 * This library is free software; you can redistribute it and/or [ 2] 0x00007fff3f95b8d5 WebCore`WebCore::ComputedStyleExtractor::propertyValue(WebCore::CSSPropertyID, WebCore::EUpdateLayout) + 2165 at CSSComputedStyleDeclaration.cpp:2778:12 [ 3] 0x00007fff3e8da604 WebCore`WebCore::CSSComputedStyleDeclaration::getPropertyValue(WebCore::CSSPropertyID) const [inlined] WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue(WebCore::CSSPropertyID, WebCore::EUpdateLayout) const + 40 at CSSComputedStyleDeclaration.cpp:2466:99 [ 3] 0x00007fff3e8da5dc 1551181 1 koivisto 2019-07-09 03:13:34 -0700 <rdar://problem/51518172> 1551197 2 373708 koivisto 2019-07-09 04:40:17 -0700 Created attachment 373708 patch 1551221 3 373708 zalan 2019-07-09 07:45:21 -0700 Comment on attachment 373708 patch View in context: https://bugs.webkit.org/attachment.cgi?id=373708&action=review > Source/WebCore/css/CSSComputedStyleDeclaration.cpp:794 > + auto& enclosingClippingBox = > + box.enclosingClippingBoxForStickyPosition(); why 2 lines. > Source/WebCore/rendering/RenderBoxModelObject.cpp:448 > + auto* clipLayer = layer()->enclosingOverflowClipLayer(ExcludeSelf); I guess if sticky does not produce a layer, we have bigger problems than this null deref. 1551222 4 koivisto 2019-07-09 07:47:47 -0700 > why 2 lines. OOPS > I guess if sticky does not produce a layer, we have bigger problems than > this null deref. Yep. 1551224 5 373718 koivisto 2019-07-09 07:51:34 -0700 Created attachment 373718 patch 1551231 6 373718 commit-queue 2019-07-09 08:21:17 -0700 Comment on attachment 373718 patch Clearing flags on attachment: 373718 Committed r247256: <https://trac.webkit.org/changeset/247256> 1551232 7 commit-queue 2019-07-09 08:21:19 -0700 All reviewed patches have been landed. Closing bug. 1551312 8 373718 simon.fraser 2019-07-09 11:38:54 -0700 Comment on attachment 373718 patch View in context: https://bugs.webkit.org/attachment.cgi?id=373718&action=review > LayoutTests/fast/css/getComputedStyle/sticky-scroll-container-crash.html:3 > + position: -webkit-sticky; No need to prefix any more. 373708 2019-07-09 04:40:17 -0700 2019-07-09 07:51:34 -0700 patch null-scrollport-crash.patch text/plain 8510 koivisto SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDI0NzI1NSkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDMwIEBACisyMDE5LTA3LTA5ICBBbnR0aSBL b2l2aXN0byAgPGFudHRpQGFwcGxlLmNvbT4KKworICAgICAgICBSRUdSRVNTSU9OKHIyNDQ5MDYp OiBDcmFzaCBpbiBXZWJDb3JlOjpwb3NpdGlvbk9mZnNldFZhbHVlCisgICAgICAgIGh0dHBzOi8v YnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xOTk2MTMKKyAgICAgICAgPHJkYXI6Ly9w 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