The following build: https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.webkit%2FWebKit_Linux_Trusty_MSAN%2F1769%2F%2B%2Frecipes%2Fsteps%2Fwebkit_layout_tests%2F0%2Fstdout

emitted the following MSan output:
05:25:49.713 538   ==1==WARNING: MemorySanitizer: use-of-uninitialized-value
05:25:49.713 538       #0 0xeb19110 in blink::InlineBox::DeleteLine() third_party/WebKit/Source/core/layout/line/InlineBox.cpp:198:7
05:25:49.714 538       #1 0xeb226fc in blink::InlineFlowBox::DeleteLine() third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp:226:12
05:25:49.714 538       #2 0xeb56888 in blink::LineBoxList::DeleteLineBoxTree() third_party/WebKit/Source/core/layout/line/LineBoxList.cpp:65:11
05:25:49.714 538       #3 0x14440980 in blink::NGInlineNode::CopyFragmentDataToLayoutBox(blink::NGConstraintSpace const&, blink::NGLayoutResult*) third_party/WebKit/Source/core/layout/ng/inline/ng_inline_node.cc:421:15
05:25:49.714 538       #4 0x1444010c in blink::NGInlineNode::Layout(blink::NGConstraintSpace*, blink::NGBreakToken*) third_party/WebKit/Source/core/layout/ng/inline/ng_inline_node.cc:346:3
05:25:49.714 538       #5 0xebe1937 in blink::NGLayoutInputNode::Layout(blink::NGConstraintSpace*, blink::NGBreakToken*) third_party/WebKit/Source/core/layout/ng/ng_layout_input_node.cc:81:45
05:25:49.714 538       #6 0xec0220c in blink::NGBlockLayoutAlgorithm::Layout() third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.cc:261:17
05:25:49.714 538       #7 0xebc674c in LayoutWithAlgorithm third_party/WebKit/Source/core/layout/ng/ng_block_node.cc:43:8
05:25:49.714 538       #8 0xebc674c in blink::NGBlockNode::Layout(blink::NGConstraintSpace*, blink::NGBreakToken*) third_party/WebKit/Source/core/layout/ng/ng_block_node.cc:136:0
05:25:49.714 538       #9 0xebe193e in blink::NGLayoutInputNode::Layout(blink::NGConstraintSpace*, blink::NGBreakToken*) third_party/WebKit/Source/core/layout/ng/ng_layout_input_node.cc:82:44
05:25:49.714 538       #10 0xec0220c in blink::NGBlockLayoutAlgorithm::Layout() third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.cc:261:17
05:25:49.714 538       #11 0xebc674c in LayoutWithAlgorithm third_party/WebKit/Source/core/layout/ng/ng_block_node.cc:43:8
05:25:49.714 538       #12 0xebc674c in blink::NGBlockNode::Layout(blink::NGConstraintSpace*, blink::NGBreakToken*) third_party/WebKit/Source/core/layout/ng/ng_block_node.cc:136:0
05:25:49.714 538       #13 0xebe193e in blink::NGLayoutInputNode::Layout(blink::NGConstraintSpace*, blink::NGBreakToken*) third_party/WebKit/Source/core/layout/ng/ng_layout_input_node.cc:82:44
05:25:49.714 538       #14 0xec0220c in blink::NGBlockLayoutAlgorithm::Layout() third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.cc:261:17
05:25:49.714 538       #15 0xebc674c in LayoutWithAlgorithm third_party/WebKit/Source/core/layout/ng/ng_block_node.cc:43:8
05:25:49.714 538       #16 0xebc674c in blink::NGBlockNode::Layout(blink::NGConstraintSpace*, blink::NGBreakToken*) third_party/WebKit/Source/core/layout/ng/ng_block_node.cc:136:0
05:25:49.714 538       #17 0xebc393d in blink::LayoutNGBlockFlow::UpdateBlockLayout(bool) third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc:27:25
05:25:49.714 538       #18 0xe50f6c6 in blink::LayoutBlock::UpdateLayout() third_party/WebKit/Source/core/layout/LayoutBlock.cpp:429:3
05:25:49.714 538       #19 0xe558e53 in blink::LayoutBlockFlow::PositionAndLayoutOnceIfNeeded(blink::LayoutBox&, blink::LayoutUnit, blink::BlockChildrenLayoutInfo&) third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp:747:11
05:25:49.714 538       #20 0xe55a24d in blink::LayoutBlockFlow::LayoutBlockChild(blink::LayoutBox&, blink::BlockChildrenLayoutInfo&) third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp:810:7
05:25:49.714 538       #21 0xe554982 in blink::LayoutBlockFlow::LayoutBlockChildren(bool, blink::SubtreeLayoutScope&, blink::LayoutUnit, blink::LayoutUnit) third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp:1515:5
05:25:49.714 538       #22 0xe549c66 in blink::LayoutBlockFlow::LayoutChildren(bool, blink::SubtreeLayoutScope&) third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp:555:5
05:25:49.714 538       #23 0xe547be4 in blink::LayoutBlockFlow::UpdateBlockLayout(bool) third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp:436:5
05:25:49.714 538       #24 0xe50f6c6 in blink::LayoutBlock::UpdateLayout() third_party/WebKit/Source/core/layout/LayoutBlock.cpp:429:3
05:25:49.714 538       #25 0xea28fda in LayoutContent third_party/WebKit/Source/core/layout/LayoutView.cpp:224:20
05:25:49.714 538       #26 0xea28fda in blink::LayoutView::UpdateLayout() third_party/WebKit/Source/core/layout/LayoutView.cpp:316:0
05:25:49.714 538       #27 0xd936bff in blink::LocalFrameView::PerformLayout(bool) third_party/WebKit/Source/core/frame/LocalFrameView.cpp:1084:22
05:25:49.714 538       #28 0xd92ada8 in blink::LocalFrameView::UpdateLayout() third_party/WebKit/Source/core/frame/LocalFrameView.cpp:1267:10
05:25:49.714 538       #29 0xcfca7e5 in blink::Document::ImplicitClose() third_party/WebKit/Source/core/dom/Document.cpp:3130:15
05:25:49.714 538       #30 0xcfc9540 in blink::Document::CheckCompleted() third_party/WebKit/Source/core/dom/Document.cpp:3187:5
05:25:49.714 538       #31 0xed48120 in blink::FrameLoader::FinishedParsing() third_party/WebKit/Source/core/loader/FrameLoader.cpp:446:26
05:25:49.714 538       #32 0xd00713b in blink::Document::FinishedParsing() third_party/WebKit/Source/core/dom/Document.cpp:5615:21
05:25:49.714 538       #33 0xe087b19 in end third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp:958:18
05:25:49.714 538       #34 0xe087b19 in AttemptToRunDeferredScriptsAndEnd third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp:970:0
05:25:49.714 538       #35 0xe087b19 in blink::HTMLDocumentParser::PrepareToStopParsing() third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp:258:0
05:25:49.714 538       #36 0xe09338f in blink::HTMLDocumentParser::ProcessTokenizedChunkFromBackgroundParser(std::__1::unique_ptr<blink::HTMLDocumentParser::TokenizedChunk, std::__1::default_delete<blink::HTMLDocumentParser::TokenizedChunk> >) third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp:589:7
05:25:49.714 538       #37 0xe089c5a in blink::HTMLDocumentParser::PumpPendingSpeculations() third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp:637:9
05:25:49.714 538       #38 0xc2a2616 in Run base/callback.h:80:12
05:25:49.714 538       #39 0xc2a2616 in operator() third_party/WebKit/Source/platform/wtf/Functional.h:223:0
05:25:49.714 538       #40 0xc2a2616 in blink::TaskHandle::Runner::Run(blink::TaskHandle const&) third_party/WebKit/Source/platform/WebTaskRunner.cpp:75:0
05:25:49.714 538       #41 0x6bd5ccd in Run base/callback.h:91:12
05:25:49.715 538       #42 0x6bd5ccd in base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) base/debug/task_annotator.cc:59:0
05:25:49.715 538       #43 0xc84b852 in blink::scheduler::TaskQueueManager::ProcessTaskFromWorkQueue(blink::scheduler::internal::WorkQueue*, bool, blink::scheduler::LazyNow, base::TimeTicks*) third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc:531:19
05:25:49.715 538       #44 0xc841a6a in blink::scheduler::TaskQueueManager::DoWork(bool) third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc:329:13
05:25:49.715 538       #45 0x6bd5ccd in Run base/callback.h:91:12
05:25:49.715 538       #46 0x6bd5ccd in base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) base/debug/task_annotator.cc:59:0
05:25:49.715 538       #47 0x698ef03 in base::MessageLoop::RunTask(base::PendingTask*) base/message_loop/message_loop.cc:422:19
05:25:49.715 538       #48 0x6990a47 in base::MessageLoop::DeferOrRunPendingTask(base::PendingTask) base/message_loop/message_loop.cc:433:5
05:25:49.715 538       #49 0x6991a46 in base::MessageLoop::DoWork() base/message_loop/message_loop.cc:540:13
05:25:49.715 538       #50 0x699e49a in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) base/message_loop/message_pump_default.cc:33:31
05:25:49.715 538       #51 0x6a2fe58 in base::RunLoop::Run() base/run_loop.cc:111:14
05:25:49.715 538       #52 0x108022ee in content::RendererMain(content::MainFunctionParams const&) content/renderer/renderer_main.cc:219:23
05:25:49.715 538       #53 0x4632392 in content::RunZygote(content::MainFunctionParams const&, content::ContentMainDelegate*) content/app/content_main_runner.cc:336:14
05:25:49.715 538       #54 0x4634fd8 in content::RunNamedProcessTypeMain(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, content::MainFunctionParams const&, content::ContentMainDelegate*) content/app/content_main_runner.cc:415:12
05:25:49.715 538       #55 0x46383ce in content::ContentMainRunnerImpl::Run() content/app/content_main_runner.cc:696:12
05:25:49.715 538       #56 0xb3ea201 in service_manager::Main(service_manager::MainParams const&) services/service_manager/embedder/main.cc:469:29
05:25:49.715 538       #57 0x15627ee in content::ContentMain(content::ContentMainParams const&) content/app/content_main.cc:19:10
05:25:49.715 538       #58 0x4a83ff in main content/shell/app/shell_main.cc:48:10
05:25:49.715 538       #59 0x7fa9a2d55f44 in __libc_start_main /build/eglibc-MjiXCM/eglibc-2.19/csu/libc-start.c:287:0
05:25:49.715 538       #60 0x43ca9d in _start ??:0:0
05:25:49.715 538   
05:25:49.715 538     Uninitialized value was created by a heap deallocation
05:25:49.715 538       #0 0x45a289 in __interceptor_free ??:0:0
05:25:49.715 538       #1 0xd203bc0 in blink::Node::DetachLayoutTree(blink::Node::AttachContext const&) third_party/WebKit/Source/core/dom/Node.cpp:1045:24
05:25:49.715 538       #2 0xcf03e1c in blink::ContainerNode::DetachLayoutTree(blink::Node::AttachContext const&) third_party/WebKit/Source/core/dom/ContainerNode.cpp:943:9
05:25:49.715 538       #3 0xd0a009f in blink::Element::DetachLayoutTree(blink::Node::AttachContext const&) third_party/WebKit/Source/core/dom/Element.cpp:1872:18
05:25:49.715 538       #4 0xcf010bb in blink::ContainerNode::RemoveBetween(blink::Node*, blink::Node*, blink::Node&) third_party/WebKit/Source/core/dom/ContainerNode.cpp:695:15
05:25:49.715 538       #5 0xcefd7eb in blink::ContainerNode::RemoveChild(blink::Node*, blink::ExceptionState&) third_party/WebKit/Source/core/dom/ContainerNode.cpp:676:5
05:25:49.715 538       #6 0xd1f8c83 in blink::Node::removeChild(blink::Node*, blink::ExceptionState&) third_party/WebKit/Source/core/dom/Node.cpp:461:35
05:25:49.715 538       #7 0xb814122 in removeChildMethod ./out/Release/gen/blink/bindings/core/v8/V8Node.cpp:690:24
05:25:49.715 538       #8 0xb814122 in blink::V8Node::removeChildMethodCallback(v8::FunctionCallbackInfo<v8::Value> const&) ./out/Release/gen/blink/bindings/core/v8/V8Node.cpp:888:0
05:25:49.715 538       #9 0x183bd6e in v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) v8/src/api-arguments.cc:25:3
05:25:49.715 538       #10 0x1b4481a in v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) v8/src/builtins/builtins-api.cc:112:36
05:25:49.715 538       #11 0x1b4093d in v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) v8/src/builtins/builtins-api.cc:142:5
05:25:49.715 538       #12 0x3d70de3 in v8::internal::Simulator::DoRuntimeCall(v8::internal::Instruction*) v8/src/arm64/simulator-arm64.cc:635:11
05:25:49.715 538       #13 0x3d6fd12 in ExecuteInstruction v8/src/arm64/simulator-arm64.h:846:5
05:25:49.715 538       #14 0x3d6fd12 in v8::internal::Simulator::Run() v8/src/arm64/simulator-arm64.cc:454:0
05:25:49.715 538       #15 0x3d6c7d8 in CheckPCSComplianceAndRun v8/src/arm64/simulator-arm64.cc:255:3
05:25:49.715 538       #16 0x3d6c7d8 in v8::internal::Simulator::CallVoid(unsigned char*, v8::internal::Simulator::CallArgument*) v8/src/arm64/simulator-arm64.cc:167:0
05:25:49.715 538       #17 0x3d6d79c in CallInt64 v8/src/arm64/simulator-arm64.cc:174:3
05:25:49.715 538       #18 0x3d6d79c in v8::internal::Simulator::CallJS(unsigned char*, v8::internal::Object*, v8::internal::Object*, v8::internal::Object*, long, v8::internal::Object***) v8/src/arm64/simulator-arm64.cc:199:0
05:25:49.715 538       #19 0x291a703 in v8::internal::(anonymous namespace)::Invoke(v8::internal::Isolate*, bool, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, int, v8::internal::Handle<v8::internal::Object>*, v8::internal::Handle<v8::internal::Object>, v8::internal::Execution::MessageHandling) v8/src/execution.cc:145:13
05:25:49.715 538       #20 0x291972b in CallInternal v8/src/execution.cc:181:10
05:25:49.715 538       #21 0x291972b in v8::internal::Execution::Call(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, int, v8::internal::Handle<v8::internal::Object>*) v8/src/execution.cc:191:0
05:25:49.715 538       #22 0x18713dc in v8::Script::Run(v8::Local<v8::Context>) v8/src/api.cc:2065:7
05:25:49.715 538       #23 0xb6666d5 in blink::V8ScriptRunner::RunCompiledScript(v8::Isolate*, v8::Local<v8::Script>, blink::ExecutionContext*) third_party/WebKit/Source/bindings/core/v8/V8ScriptRunner.cpp:574:22
05:25:49.715 538       #24 0x12ec15b8 in blink::ScriptController::ExecuteScriptAndReturnValue(v8::Local<v8::Context>, blink::ScriptSourceCode const&, blink::AccessControlStatus) third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp:135:10
05:25:49.715 538   
05:25:49.715 538   SUMMARY: MemorySanitizer: use-of-uninitialized-value (/b/s/w/ir/out/Release/content_shell+0xeb19110)
05:25:49.715 538   Exiting

and also this related MSan output:

05:25:51.044 13810   ==1==WARNING: MemorySanitizer: use-of-uninitialized-value
05:25:51.044 13810       #0 0xeb17aae in operator* third_party/WebKit/Source/platform/heap/Member.h:83:34
05:25:51.044 13810       #1 0xeb17aae in GetTreeScope third_party/WebKit/Source/core/dom/Node.h:560:0
05:25:51.044 13810       #2 0xeb17aae in GetDocument third_party/WebKit/Source/core/dom/Node.h:556:0
05:25:51.044 13810       #3 0xeb17aae in GetDocument third_party/WebKit/Source/core/layout/LayoutObject.h:925:0
05:25:51.044 13810       #4 0xeb17aae in DocumentBeingDestroyed third_party/WebKit/Source/core/layout/LayoutObject.h:2667:0
05:25:51.044 13810       #5 0xeb17aae in DocumentBeingDestroyed third_party/WebKit/Source/core/layout/api/LineLayoutItem.h:291:0
05:25:51.044 13810       #6 0xeb17aae in blink::InlineBox::Destroy() third_party/WebKit/Source/core/layout/line/InlineBox.cpp:65:0
05:25:51.044 13810       #7 0xeb226fc in blink::InlineFlowBox::DeleteLine() third_party/WebKit/Source/core/layout/line/InlineFlowBox.cpp:226:12
05:25:51.044 13810       #8 0xeb56888 in blink::LineBoxList::DeleteLineBoxTree() third_party/WebKit/Source/core/layout/line/LineBoxList.cpp:65:11
05:25:51.044 13810       #9 0xe7fd46c in blink::LayoutInline::SplitFlow(blink::LayoutObject*, blink::LayoutBlockFlow*, blink::LayoutObject*, blink::LayoutBoxModelObject*) third_party/WebKit/Source/core/layout/LayoutInline.cpp:499:10
05:25:51.044 13810       #10 0xe7fc1cf in blink::LayoutInline::AddChildIgnoringContinuation(blink::LayoutObject*, blink::LayoutObject*) third_party/WebKit/Source/core/layout/LayoutInline.cpp:370:5
05:25:51.044 13810       #11 0xd177c09 in blink::LayoutTreeBuilderForElement::CreateLayoutObject() third_party/WebKit/Source/core/dom/LayoutTreeBuilder.cpp:144:25
05:25:51.044 13810       #12 0xd09ceb6 in CreateLayoutObjectIfNeeded third_party/WebKit/Source/core/dom/LayoutTreeBuilder.h:91:7
05:25:51.044 13810       #13 0xd09ceb6 in blink::Element::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/Element.cpp:1800:0
05:25:51.044 13810       #14 0xd3dbba6 in blink::V0InsertionPoint::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/V0InsertionPoint.cpp:117:14
05:25:51.044 13810       #15 0xcf03a1a in blink::ContainerNode::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/ContainerNode.cpp:923:14
05:25:51.044 13810       #16 0xd325297 in blink::ShadowRoot::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/ShadowRoot.cpp:205:21
05:25:51.044 13810       #17 0xd105c04 in blink::ElementShadow::Attach(blink::Node::AttachContext const&) third_party/WebKit/Source/core/dom/ElementShadow.cpp:120:13
05:25:51.044 13810       #18 0xd09d55f in blink::Element::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/Element.cpp:1825:13
05:25:51.044 13810       #19 0xdd789cb in blink::HTMLPlugInElement::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/html/HTMLPlugInElement.cpp:182:26
05:25:51.044 13810       #20 0xd0a9a00 in blink::Element::RebuildLayoutTree(blink::WhitespaceAttacher&) third_party/WebKit/Source/core/dom/Element.cpp:2127:5
05:25:51.044 13810       #21 0xcf0d6c9 in blink::ContainerNode::RebuildChildrenLayoutTrees(blink::WhitespaceAttacher&) third_party/WebKit/Source/core/dom/ContainerNode.cpp:1500:5
05:25:51.044 13810       #22 0xd0a9f51 in blink::Element::RebuildLayoutTree(blink::WhitespaceAttacher&) third_party/WebKit/Source/core/dom/Element.cpp:2152:5
05:25:51.044 13810       #23 0xcf0d6c9 in blink::ContainerNode::RebuildChildrenLayoutTrees(blink::WhitespaceAttacher&) third_party/WebKit/Source/core/dom/ContainerNode.cpp:1500:5
05:25:51.044 13810       #24 0xd0a9f51 in blink::Element::RebuildLayoutTree(blink::WhitespaceAttacher&) third_party/WebKit/Source/core/dom/Element.cpp:2152:5
05:25:51.044 13810       #25 0xcfb441d in blink::Document::UpdateStyle() third_party/WebKit/Source/core/dom/Document.cpp:2183:25
05:25:51.044 13810       #26 0xcf9dbdc in blink::Document::UpdateStyleAndLayoutTree() third_party/WebKit/Source/core/dom/Document.cpp:2092:3
05:25:51.044 13810       #27 0xd9658d2 in blink::LocalFrameView::UpdateStyleAndLayoutIfNeededRecursiveInternal() third_party/WebKit/Source/core/frame/LocalFrameView.cpp:3428:26
05:25:51.044 13810       #28 0xd95d8bc in blink::LocalFrameView::UpdateStyleAndLayoutIfNeededRecursive() third_party/WebKit/Source/core/frame/LocalFrameView.cpp:3407:3
05:25:51.044 13810       #29 0xd9591dd in blink::LocalFrameView::UpdateLifecyclePhasesInternal(blink::DocumentLifecycle::LifecycleState) third_party/WebKit/Source/core/frame/LocalFrameView.cpp:3147:3
05:25:51.044 13810       #30 0xef3427c in blink::PageAnimator::UpdateAllLifecyclePhases(blink::LocalFrame&) third_party/WebKit/Source/core/page/PageAnimator.cpp:100:9
05:25:51.044 13810       #31 0xfbe4b23 in blink::WebViewImpl::UpdateAllLifecyclePhases() third_party/WebKit/Source/web/WebViewImpl.cpp:2024:3
05:25:51.044 13810       #32 0x110e5b6c in test_runner::WebWidgetTestClient::AnimateNow() content/shell/test_runner/web_widget_test_client.cc:53:17
05:25:51.044 13810       #33 0x6bd5ccd in Run base/callback.h:91:12
05:25:51.044 13810       #34 0x6bd5ccd in base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) base/debug/task_annotator.cc:59:0
05:25:51.045 13810       #35 0xc84b852 in blink::scheduler::TaskQueueManager::ProcessTaskFromWorkQueue(blink::scheduler::internal::WorkQueue*, bool, blink::scheduler::LazyNow, base::TimeTicks*) third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc:531:19
05:25:51.045 13810       #36 0xc841a6a in blink::scheduler::TaskQueueManager::DoWork(bool) third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc:329:13
05:25:51.045 13810       #37 0x6bd5ccd in Run base/callback.h:91:12
05:25:51.045 13810       #38 0x6bd5ccd in base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*) base/debug/task_annotator.cc:59:0
05:25:51.045 13810       #39 0x698ef03 in base::MessageLoop::RunTask(base::PendingTask*) base/message_loop/message_loop.cc:422:19
05:25:51.045 13810       #40 0x6990a47 in base::MessageLoop::DeferOrRunPendingTask(base::PendingTask) base/message_loop/message_loop.cc:433:5
05:25:51.045 13810       #41 0x6991a46 in base::MessageLoop::DoWork() base/message_loop/message_loop.cc:540:13
05:25:51.045 13810       #42 0x699e49a in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) base/message_loop/message_pump_default.cc:33:31
05:25:51.045 13810       #43 0x6a2fe58 in base::RunLoop::Run() base/run_loop.cc:111:14
05:25:51.045 13810       #44 0x108022ee in content::RendererMain(content::MainFunctionParams const&) content/renderer/renderer_main.cc:219:23
05:25:51.045 13810       #45 0x4632392 in content::RunZygote(content::MainFunctionParams const&, content::ContentMainDelegate*) content/app/content_main_runner.cc:336:14
05:25:51.045 13810       #46 0x4634fd8 in content::RunNamedProcessTypeMain(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, content::MainFunctionParams const&, content::ContentMainDelegate*) content/app/content_main_runner.cc:415:12
05:25:51.045 13810       #47 0x46383ce in content::ContentMainRunnerImpl::Run() content/app/content_main_runner.cc:696:12
05:25:51.045 13810       #48 0xb3ea201 in service_manager::Main(service_manager::MainParams const&) services/service_manager/embedder/main.cc:469:29
05:25:51.045 13810       #49 0x15627ee in content::ContentMain(content::ContentMainParams const&) content/app/content_main.cc:19:10
05:25:51.045 13810       #50 0x4a83ff in main content/shell/app/shell_main.cc:48:10
05:25:51.045 13810       #51 0x7f7a31f64f44 in __libc_start_main /build/eglibc-MjiXCM/eglibc-2.19/csu/libc-start.c:287:0
05:25:51.045 13810       #52 0x43ca9d in _start ??:0:0
05:25:51.045 13810   
05:25:51.045 13810     Uninitialized value was stored to memory at
05:25:51.045 13810       #0 0x12f6db27 in Length third_party/WebKit/Source/platform/Length.h:95:5
05:25:51.045 13810       #1 0x12f6db27 in LengthSize third_party/WebKit/Source/platform/LengthSize.h:29:0
05:25:51.045 13810       #2 0x12f6db27 in blink::ComputedStyleBase::StyleSurroundData::StyleSurroundData(blink::ComputedStyleBase::StyleSurroundData const&) ./out/Release/gen/blink/core/ComputedStyleBase.cpp:1370:0
05:25:51.045 13810       #3 0xcd902b2 in Copy ./out/Release/gen/blink/core/ComputedStyleBase.h:5201:27
05:25:51.045 13810       #4 0xcd902b2 in blink::DataRef<blink::ComputedStyleBase::StyleSurroundData>::Access() third_party/WebKit/Source/core/style/DataRef.h:44:0
05:25:51.045 13810       #5 0xe840e77 in blink::ComputedStyleBase::SetPaddingTop(blink::Length&&) ./out/Release/gen/blink/core/ComputedStyleBase.h:2958:22
05:25:51.045 13810       #6 0x13001be2 in blink::StyleBuilderFunctions::applyValueCSSPropertyPaddingTop(blink::StyleResolverState&, blink::CSSValue const&) ./out/Release/gen/blink/core/StyleBuilderFunctions.cpp:2819:18
05:25:51.045 13810       #7 0xce8bde2 in blink::StyleBuilder::ApplyProperty(blink::CSSPropertyID, blink::StyleResolverState&, blink::CSSValue const&) third_party/WebKit/Source/core/css/resolver/StyleBuilderCustom.cpp:163:3
05:25:51.045 13810       #8 0xce102f6 in void blink::StyleResolver::ApplyProperties<(blink::CSSPropertyPriority)3, (blink::StyleResolver::ShouldUpdateNeedsApplyPass)0>(blink::StyleResolverState&, blink::StylePropertySet const*, bool, bool, blink::StyleResolver::NeedsApplyPass&, blink::PropertyWhitelistType) third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp:1643:5
05:25:51.045 13810       #9 0xcde2d24 in void blink::StyleResolver::ApplyMatchedProperties<(blink::CSSPropertyPriority)3, (blink::StyleResolver::ShouldUpdateNeedsApplyPass)0>(blink::StyleResolverState&, blink::MatchedPropertiesRange const&, bool, bool, blink::StyleResolver::NeedsApplyPass&) third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp:1682:5
05:25:51.045 13810       #10 0xcdedc27 in blink::StyleResolver::ApplyMatchedStandardProperties(blink::StyleResolverState&, blink::MatchResult const&, blink::StyleResolver::CacheSuccess const&, blink::StyleResolver::NeedsApplyPass&) third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp:1949:3
05:25:51.045 13810       #11 0xcdd598e in blink::StyleResolver::ApplyMatchedPropertiesAndCustomPropertyAnimations(blink::StyleResolverState&, blink::MatchResult const&, blink::Element const*) third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp:1733:5
05:25:51.045 13810       #12 0xcdd1eee in blink::StyleResolver::StyleForElement(blink::Element*, blink::ComputedStyle const*, blink::ComputedStyle const*, blink::StyleSharingBehavior, blink::RuleMatchingBehavior) third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp:755:5
05:25:51.045 13810       #13 0xd0a0f1f in OriginalStyleForLayoutObject third_party/WebKit/Source/core/dom/Element.cpp:1928:46
05:25:51.045 13810       #14 0xd0a0f1f in blink::Element::StyleForLayoutObject() third_party/WebKit/Source/core/dom/Element.cpp:1905:0
05:25:51.045 13810       #15 0xd176346 in blink::LayoutTreeBuilderForElement::Style() const third_party/WebKit/Source/core/dom/LayoutTreeBuilder.cpp:104:21
05:25:51.045 13810       #16 0xd1760d6 in blink::LayoutTreeBuilderForElement::ShouldCreateLayoutObject() const third_party/WebKit/Source/core/dom/LayoutTreeBuilder.cpp:99:38
05:25:51.045 13810       #17 0xd09ce93 in CreateLayoutObjectIfNeeded third_party/WebKit/Source/core/dom/LayoutTreeBuilder.h:90:9
05:25:51.045 13810       #18 0xd09ce93 in blink::Element::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/Element.cpp:1800:0
05:25:51.045 13810       #19 0xd3dbba6 in blink::V0InsertionPoint::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/V0InsertionPoint.cpp:117:14
05:25:51.045 13810       #20 0xcf03a1a in blink::ContainerNode::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/ContainerNode.cpp:923:14
05:25:51.045 13810       #21 0xd325297 in blink::ShadowRoot::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/ShadowRoot.cpp:205:21
05:25:51.045 13810       #22 0xd105c04 in blink::ElementShadow::Attach(blink::Node::AttachContext const&) third_party/WebKit/Source/core/dom/ElementShadow.cpp:120:13
05:25:51.046 13810       #23 0xd09d55f in blink::Element::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/dom/Element.cpp:1825:13
05:25:51.046 13810       #24 0xdd789cb in blink::HTMLPlugInElement::AttachLayoutTree(blink::Node::AttachContext&) third_party/WebKit/Source/core/html/HTMLPlugInElement.cpp:182:26
05:25:51.046 13810   
05:25:51.046 13810     Uninitialized value was stored to memory at
05:25:51.046 13810       #0 0x12f6c499 in Length third_party/WebKit/Source/platform/Length.h:95:5
05:25:51.046 13810       #1 0x12f6c499 in LengthSize third_party/WebKit/Source/platform/LengthSize.h:36:0
05:25:51.046 13810       #2 0x12f6c499 in blink::ComputedStyleBase::StyleSurroundData::StyleSurroundData() ./out/Release/gen/blink/core/ComputedStyleBase.cpp:1333:0
05:25:51.046 13810       #3 0x12f40a07 in Create ./out/Release/gen/blink/core/ComputedStyleBase.h:5198:27
05:25:51.046 13810       #4 0x12f40a07 in blink::DataRef<blink::ComputedStyleBase::StyleSurroundData>::Init() third_party/WebKit/Source/core/style/DataRef.h:50:0
05:25:51.046 13810       #5 0x12f3fb75 in blink::ComputedStyleBase::ComputedStyleBase() ./out/Release/gen/blink/core/ComputedStyleBase.cpp:86:18
05:25:51.046 13810       #6 0xf26c684 in ComputedStyle third_party/WebKit/Source/core/style/ComputedStyle.cpp:124:7
05:25:51.046 13810       #7 0xf26c684 in CreateInitialStyle third_party/WebKit/Source/core/style/ComputedStyle.cpp:95:0
05:25:51.046 13810       #8 0xf26c684 in blink::ComputedStyle::MutableInitialStyle() third_party/WebKit/Source/core/style/ComputedStyle.cpp:100:0
05:25:51.046 13810       #9 0xf26bbeb in InitialStyle third_party/WebKit/Source/core/style/ComputedStyle.h:205:55
05:25:51.046 13810       #10 0xf26bbeb in blink::ComputedStyle::Create() third_party/WebKit/Source/core/style/ComputedStyle.cpp:91:0
05:25:51.046 13810       #11 0xcdcd2a9 in blink::StyleResolver::InitialStyleForElement(blink::Document&) third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp:1040:41
05:25:51.046 13810       #12 0xcdccd3f in blink::StyleResolver::StyleForViewport(blink::Document&) third_party/WebKit/Source/core/css/resolver/StyleResolver.cpp:554:42
05:25:51.046 13810       #13 0xcfbdcfd in blink::Document::Initialize() third_party/WebKit/Source/core/dom/Document.cpp:2542:26
05:25:51.046 13810       #14 0xd8b5331 in blink::LocalDOMWindow::InstallNewDocument(WTF::String const&, blink::DocumentInit const&, bool) third_party/WebKit/Source/core/frame/LocalDOMWindow.cpp:342:14
05:25:51.046 13810       #15 0xecfd6cc in blink::DocumentLoader::InstallNewDocument(blink::DocumentInit const&, WTF::AtomicString const&, WTF::AtomicString const&, blink::DocumentLoader::InstallNewDocumentReason, blink::ParserSynchronizationPolicy, blink::KURL const&) third_party/WebKit/Source/core/loader/DocumentLoader.cpp:1074:45
05:25:51.046 13810       #16 0xecfcfd2 in blink::DocumentLoader::EnsureWriter(WTF::AtomicString const&, blink::KURL const&) third_party/WebKit/Source/core/loader/DocumentLoader.cpp:684:3
05:25:51.046 13810       #17 0xecf7e81 in blink::DocumentLoader::CommitData(char const*, unsigned long) third_party/WebKit/Source/core/loader/DocumentLoader.cpp:694:3
05:25:51.046 13810       #18 0xecf6b6d in blink::DocumentLoader::FinishedLoading(double) third_party/WebKit/Source/core/loader/DocumentLoader.cpp:452:7
05:25:51.046 13810       #19 0xecff858 in blink::DocumentLoader::MaybeLoadEmpty() third_party/WebKit/Source/core/loader/DocumentLoader.cpp:847:3
05:25:51.046 13810       #20 0xecffba9 in blink::DocumentLoader::StartLoading() third_party/WebKit/Source/core/loader/DocumentLoader.cpp:857:7
05:25:51.046 13810       #21 0xed450ad in blink::FrameLoader::Init() third_party/WebKit/Source/core/loader/FrameLoader.cpp:299:33
05:25:51.046 13810       #22 0xfba6886 in blink::WebLocalFrameImpl::InitializeCoreFrame(blink::Page&, blink::FrameOwner*, WTF::AtomicString const&) third_party/WebKit/Source/web/WebLocalFrameImpl.cpp:1670:11
05:25:51.046 13810       #23 0xfba422a in blink::WebLocalFrameImpl::CreateMainFrame(blink::WebView*, blink::WebFrameClient*, blink::InterfaceProvider*, blink::InterfaceRegistry*, blink::WebFrame*, blink::WebString const&, blink::WebSandboxFlags) third_party/WebKit/Source/web/WebLocalFrameImpl.cpp:1546:10
05:25:51.046 13810       #24 0x105f476d in content::RenderFrameImpl::CreateMainFrame(content::RenderViewImpl*, int, int, bool, content::ScreenInfo const&, content::CompositorDependencies*, blink::WebFrame*, content::FrameReplicationState const&) content/renderer/render_frame_impl.cc:995:30
05:25:51.046 13810       #25 0x10752958 in content::RenderViewImpl::Initialize(content::mojom::CreateViewParams const&, base::Callback<void (content::RenderWidget*, blink::WebNavigationPolicy, gfx::Rect const&), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&) content/renderer/render_view_impl.cc:631:26
05:25:51.046 13810   
05:25:51.046 13810     Uninitialized value was created by an allocation of 'ref.tmp3' in the stack frame of function '_ZN5blink17ComputedStyleBase17StyleSurroundDataC2Ev'
05:25:51.046 13810       #0 0x12f6b6f0 in blink::ComputedStyleBase::StyleSurroundData::StyleSurroundData() ./out/Release/gen/blink/core/ComputedStyleBase.cpp:1364:0
05:25:51.046 13810   
05:25:51.046 13810   SUMMARY: MemorySanitizer: use-of-uninitialized-value (/b/s/w/ir/out/Release/content_shell+0xeb17aae)
05:25:51.046 13810   Exiting

Marking for blink triage.