224757 2021-04-19 07:45:01 -0700 Crash in RenderObjectBitfields::needsLayout 2021-04-21 20:41:34 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ajuma zalan bfulgham changseok darin esprehn+autocc ews-feeder ews-watchlist glenn koivisto kondapallykalyan pdr product-security rniwa rohitrao simon.fraser webkit-bug-importer zalan oldest_to_newest 1751766 0 426416 ajuma 2021-04-19 07:45:01 -0700 Created attachment 426416 Minimal test case Filing this as a security bug since it was found using a fuzzer; there's no disclosure deadline for this bug. This reproduces in an ASan build of WebKitTestRunner, as well as in STP 123. Stack: ================================================================= ==20046==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000030 (pc 0x0005f2b68e9e bp 0x7ffee93874a0 sp 0x7ffee93874a0 T0) ==20046==The signal is caused by a READ memory access. ==20046==Hint: address points to the zero page. ==20046==WARNING: invalid path to external symbolizer! ==20046==WARNING: Failed to use and restart external symbolizer! #0 0x5f2b68e9d in WebCore::RenderObject::RenderObjectBitfields::needsLayout() const (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x2c5de9d) #1 0x5f3a5cbeb in WebCore::RenderObject::setNeedsLayout(WebCore::MarkingBehavior) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x3b51beb) #2 0x5f5357bd9 in WebCore::resetOverriddenHeight(WebCore::RenderBox*, WebCore::RenderObject const*) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x544cbd9) #3 0x5f53569c7 in WebCore::RenderTextControlSingleLine::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x544b9c7) #4 0x5f502a83b in WebCore::RenderBlockFlow::positionNewFloats() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x511f83b) #5 0x5f4f2c1ad in WebCore::ComplexLineLayout::positionNewFloatOnLine(WebCore::FloatingObject const&, WebCore::FloatingObject*, WebCore::LineInfo&, WebCore::LineWidth&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x50211ad) #6 0x5f53f8143 in WebCore::LineBreaker::skipLeadingWhitespace(WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::LineInfo&, WebCore::FloatingObject*, WebCore::LineWidth&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x54ed143) #7 0x5f53f85cb in WebCore::LineBreaker::nextLineBreak(WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::LineInfo&, WebCore::RenderTextInfo&, WebCore::FloatingObject*, unsigned int, WTF::Vector<WebCore::WordMeasurement, 64ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x54ed5cb) #8 0x5f4f21cf6 in WebCore::ComplexLineLayout::layoutRunsAndFloatsInRange(WebCore::LineLayoutState&, WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::InlineIterator const&, WebCore::BidiStatus const&, unsigned int) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5016cf6) #9 0x5f4f1fc68 in WebCore::ComplexLineLayout::layoutRunsAndFloats(WebCore::LineLayoutState&, bool) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5014c68) #10 0x5f4f277fd in WebCore::ComplexLineLayout::layoutLineBoxes(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x501c7fd) #11 0x5f5020aef in WebCore::RenderBlockFlow::layoutInlineChildren(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5115aef) #12 0x5f501f19e in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x511419e) #13 0x5f4ff02c4 in WebCore::RenderBlock::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x50e52c4) #14 0x5f5146886 in WebCore::RenderFragmentedFlow::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x523b886) #15 0x5f52ab220 in WebCore::RenderMultiColumnFlow::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x53a0220) #16 0x5f5045043 in WebCore::RenderBlockFlow::layoutExcludedChildren(bool) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x513a043) #17 0x5f5020d32 in WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5115d32) #18 0x5f501f1a9 in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x51141a9) #19 0x5f5021069 in WebCore::RenderBlockFlow::relayoutForPagination() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5116069) #20 0x5f501f348 in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5114348) #21 0x5f4ff02c4 in WebCore::RenderBlock::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x50e52c4) #22 0x5f50237a8 in WebCore::RenderBlockFlow::insertFloatingObject(WebCore::RenderBox&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x51187a8) #23 0x5f53f8129 in WebCore::LineBreaker::skipLeadingWhitespace(WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::LineInfo&, WebCore::FloatingObject*, WebCore::LineWidth&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x54ed129) #24 0x5f53f85cb in WebCore::LineBreaker::nextLineBreak(WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::LineInfo&, WebCore::RenderTextInfo&, WebCore::FloatingObject*, unsigned int, WTF::Vector<WebCore::WordMeasurement, 64ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x54ed5cb) #25 0x5f4f21cf6 in WebCore::ComplexLineLayout::layoutRunsAndFloatsInRange(WebCore::LineLayoutState&, WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::InlineIterator const&, WebCore::BidiStatus const&, unsigned int) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5016cf6) #26 0x5f4f1fc68 in WebCore::ComplexLineLayout::layoutRunsAndFloats(WebCore::LineLayoutState&, bool) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5014c68) #27 0x5f4f277fd in WebCore::ComplexLineLayout::layoutLineBoxes(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x501c7fd) #28 0x5f5020aef in WebCore::RenderBlockFlow::layoutInlineChildren(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5115aef) #29 0x5f501f19e in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x511419e) #30 0x5f4ff02c4 in WebCore::RenderBlock::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x50e52c4) #31 0x5f50237a8 in WebCore::RenderBlockFlow::insertFloatingObject(WebCore::RenderBox&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x51187a8) #32 0x5f53f8129 in WebCore::LineBreaker::skipLeadingWhitespace(WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::LineInfo&, WebCore::FloatingObject*, WebCore::LineWidth&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x54ed129) #33 0x5f53f85cb in WebCore::LineBreaker::nextLineBreak(WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::LineInfo&, WebCore::RenderTextInfo&, WebCore::FloatingObject*, unsigned int, WTF::Vector<WebCore::WordMeasurement, 64ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x54ed5cb) #34 0x5f4f21cf6 in WebCore::ComplexLineLayout::layoutRunsAndFloatsInRange(WebCore::LineLayoutState&, WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::InlineIterator const&, WebCore::BidiStatus const&, unsigned int) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5016cf6) #35 0x5f4f1fc68 in WebCore::ComplexLineLayout::layoutRunsAndFloats(WebCore::LineLayoutState&, bool) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5014c68) #36 0x5f4f277fd in WebCore::ComplexLineLayout::layoutLineBoxes(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x501c7fd) #37 0x5f5020aef in WebCore::RenderBlockFlow::layoutInlineChildren(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5115aef) #38 0x5f501f19e in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x511419e) #39 0x5f4ff02c4 in WebCore::RenderBlock::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x50e52c4) #40 0x5f50237a8 in WebCore::RenderBlockFlow::insertFloatingObject(WebCore::RenderBox&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x51187a8) #41 0x5f53f8129 in WebCore::LineBreaker::skipLeadingWhitespace(WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::LineInfo&, WebCore::FloatingObject*, WebCore::LineWidth&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x54ed129) #42 0x5f53f85cb in WebCore::LineBreaker::nextLineBreak(WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::LineInfo&, WebCore::RenderTextInfo&, WebCore::FloatingObject*, unsigned int, WTF::Vector<WebCore::WordMeasurement, 64ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x54ed5cb) #43 0x5f4f21cf6 in WebCore::ComplexLineLayout::layoutRunsAndFloatsInRange(WebCore::LineLayoutState&, WebCore::BidiResolverWithIsolate<WebCore::InlineIterator, WebCore::BidiRun, WebCore::BidiIsolatedRun>&, WebCore::InlineIterator const&, WebCore::BidiStatus const&, unsigned int) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5016cf6) #44 0x5f4f1fc68 in WebCore::ComplexLineLayout::layoutRunsAndFloats(WebCore::LineLayoutState&, bool) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5014c68) #45 0x5f4f277fd in WebCore::ComplexLineLayout::layoutLineBoxes(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x501c7fd) #46 0x5f5020aef in WebCore::RenderBlockFlow::layoutInlineChildren(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x5115aef) #47 0x5f501f19e in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x511419e) #48 0x5f4ff02c4 in WebCore::RenderBlock::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x50e52c4) #49 0x5f539777a in WebCore::RenderView::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x548c77a) #50 0x5f45668de in WebCore::FrameViewLayoutContext::layout() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x465b8de) #51 0x5f347ba56 in WebCore::Document::implicitClose() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x3570a56) #52 0x5f42f5562 in WebCore::FrameLoader::checkCompleted() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x43ea562) #53 0x5f42f2050 in WebCore::FrameLoader::finishedParsing() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x43e7050) #54 0x5f349acb2 in WebCore::Document::finishedParsing() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x358fcb2) #55 0x5f3db121a in WebCore::HTMLDocumentParser::prepareToStopParsing() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x3ea621a) #56 0x5f427be60 in WebCore::DocumentWriter::end() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x4370e60) #57 0x5f427a9dc in WebCore::DocumentLoader::finishedLoading() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x436f9dc) #58 0x5f427a348 in WebCore::DocumentLoader::notifyFinished(WebCore::CachedResource&, WebCore::NetworkLoadMetrics const&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x436f348) #59 0x5f443954f in WebCore::CachedResource::checkNotify(WebCore::NetworkLoadMetrics const&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x452e54f) #60 0x5f443545b in WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*, WebCore::NetworkLoadMetrics const&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x452a45b) #61 0x5f43aed5b in WebCore::SubresourceLoader::didFinishLoading(WebCore::NetworkLoadMetrics const&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebCore.framework/Versions/A/WebCore:x86_64+0x44a3d5b) #62 0x5e21bcab6 in WebKit::WebResourceLoader::didFinishResourceLoad(WebCore::NetworkLoadMetrics const&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x21bcab6) #63 0x5e2895626 in void IPC::handleMessage<Messages::WebResourceLoader::DidFinishResourceLoad, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(WebCore::NetworkLoadMetrics const&)>(IPC::Decoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(WebCore::NetworkLoadMetrics const&)) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x2895626) #64 0x5e2894c33 in WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(IPC::Connection&, IPC::Decoder&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x2894c33) #65 0x5e217fd4a in WebKit::NetworkProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x217fd4a) #66 0x5e008cfb9 in IPC::Connection::dispatchMessage(IPC::Decoder&) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x8cfb9) #67 0x5e008d9d6 in IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x8d9d6) #68 0x5e008e59b in IPC::Connection::dispatchOneIncomingMessage() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0x8e59b) #69 0x60bf759ac in WTF::RunLoop::performWork() (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/JavaScriptCore.framework/Versions/A/JavaScriptCore:x86_64+0xcf9ac) #70 0x60bf79055 in WTF::RunLoop::performWork(void*) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/JavaScriptCore.framework/Versions/A/JavaScriptCore:x86_64+0xd3055) #71 0x7fff2fcbd883 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64+0x84883) #72 0x7fff2fcbd822 in __CFRunLoopDoSource0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64+0x84822) #73 0x7fff2fcbd63c in __CFRunLoopDoSources0 (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64+0x8463c) #74 0x7fff2fcbc358 in __CFRunLoopRun (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64+0x83358) #75 0x7fff2fcbb952 in CFRunLoopRunSpecific (/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation:x86_64+0x82952) #76 0x7fff323791c7 in -[NSRunLoop(NSRunLoop) runMode:beforeDate:] (/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation:x86_64+0x601c7) #77 0x7fff3242bc6e in -[NSRunLoop(NSRunLoop) run] (/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation:x86_64+0x112c6e) #78 0x7fff69e984e9 in _xpc_objc_main.cold.4 (/usr/lib/system/libxpc.dylib:x86_64+0x164e9) #79 0x7fff69e9842f in _xpc_objc_main (/usr/lib/system/libxpc.dylib:x86_64+0x1642f) #80 0x7fff69e97f62 in xpc_main (/usr/lib/system/libxpc.dylib:x86_64+0x15f62) #81 0x5e0f00c73 in WebKit::XPCServiceMain(int, char const**) (/Users/chrome-bot/clusterfuzz/bot/builds/chrome-ios-webkit-to-fuzz_ios-webkit-to-fuzz_cb292771138f3c7c4bb12f2df778e2b1c42b4cd7/revisions/WebKitMacOS/WebKit.framework/Versions/A/WebKit:x86_64+0xf00c73) #82 0x7fff69c46cc8 in start (/usr/lib/system/libdyld.dylib:x86_64+0x1acc8) ==20046==Register values: rax = 0x0000000000000000 rbx = 0x0000000000000030 rcx = 0x0000100000000006 rdx = 0x00001c2c0000b1e5 rdi = 0x0000000000000030 rsi = 0x0000000000000000 rbp = 0x00007ffee93874a0 rsp = 0x00007ffee93874a0 r8 = 0x0000100000000000 r9 = 0x0000000000000000 r10 = 0xffffffffffffffff r11 = 0x00000fffffffffff r12 = 0x00007ffee93874e0 r13 = 0x00001fffdd270e9c r14 = 0x0000000000000000 r15 = 0x0000000000000000 ===================================== Clusterfuzz-id: 4922814914953216 1751767 1 webkit-bug-importer 2021-04-19 07:45:11 -0700 <rdar://problem/76844224> 1751821 2 darin 2021-04-19 09:32:09 -0700 This is another runaway loop. The inner renderer is not a descendant of "this" in RenderTextControlSingleLine::layout and so the loop in resetOverriddenHeight keeps going and we hit null. We can add a null check to the loop. Separately we can also figure out why the pre-condition is not met. 1752788 3 426702 zalan 2021-04-21 09:43:44 -0700 Created attachment 426702 test reduction 1752789 4 zalan 2021-04-21 09:47:01 -0700 This looks like the classic case of "the spanner renderer has been moved out of its original place and this code should check for the spanner placeholder instead". 1752850 5 426723 zalan 2021-04-21 12:06:54 -0700 Created attachment 426723 Patch 1752856 6 426724 zalan 2021-04-21 12:11:52 -0700 Created attachment 426724 Patch 1752877 7 426724 rniwa 2021-04-21 12:51:51 -0700 Comment on attachment 426724 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=426724&action=review > Source/WebCore/ChangeLog:12 > + Test: fast/multicol/spanner-inside-text-control.html > + > + Let's not try to span columns with the _inner_ part of a text control. Such subtrees should be opaque to multi-column layout. > + (we already do this for <legend>) Looks like these are in the wrong order? 1753027 8 426768 zalan 2021-04-21 20:39:21 -0700 Created attachment 426768 [fast-cq] Patch 1753028 9 ews-feeder 2021-04-21 20:41:31 -0700 Committed r276419 (236884@main): <https://commits.webkit.org/236884@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 426768. 426416 2021-04-19 07:45:01 -0700 2021-04-19 07:45:01 -0700 Minimal test case renderObjectBitfieldsNeedsLayout.html text/html 1105 ajuma PHN0eWxlIHR5cGU9InRleHQvY3NzIiBkaXI9Imx0ciIgeG1sOmxhbmc9ImVuIj4NCip7ZGlyZWN0 aW9uOnJ0bDt0ZXh0LXJlbmRlcmluZzpnZW9tZXRyaWNQcmVjaXNpb247dGV4dC1hbGlnbjpsZWZ0 O2NvdW50ZXItaW5jcmVtZW50OmluaGVyaXQ7Zm9udC1zaXplLWFkanVzdDppbmhlcml0O3ZlcnRp Y2FsLWFsaWduOnN1cGVyOy13ZWJraXQtdHJhbnNmb3JtLW9yaWdpbjo0JTtvdmVyZmxvdzp2aXNp YmxlOy13ZWJraXQtYXBwZWFyYW5jZTpoeXBlcmxpbms7ZmxvYXQ6cmlnaHQ7fQ0KLkNMQVNTMHst d2Via2l0LXBhZGRpbmctYmVmb3JlOmluaGVyaXQ7dGV4dC1kZWNvcmF0aW9uOmluaGVyaXQ7Z3Jp ZC1yb3dzOm5vbmU7cGVyc3BlY3RpdmUtb3JpZ2luOmNlbnRlcjstd2Via2l0LWNvbHVtbi1jb3Vu dDowMDIxNDc0ODM2NTU5OTk5OTk5OTk5OTk5OTk5OTk5OTk5OTk5OTk5OTk5OTstd2Via2l0LWNv bHVtbi1zcGFuOjE7cGFkZGluZzowLjAwMzg5ODkzMDIxMjE1NjA0NDEzODczMjY4MDA4MjE3MTEw MDM2NjM5NDk2Njg0MDc0NDAxODU1NDY4NzUlO2NvbnRlbnQ6aW5oZXJpdDstd2Via2l0LWNvbHVt 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