Bug 100466 – MathML fuzzing bugs - 4

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: MathML

[Abhishek Arya]

Created attachment 170821 [details]
Testcase - 4

=================================================================
==7926== ERROR: AddressSanitizer crashed on unknown address 0x0000000000d8 (pc 0x7f0ed7faae2b sp 0x7f0eb2930220 bp 0x7f0eb29302f0 T16)
AddressSanitizer can not provide additional info.
    #0 0x7f0ed7faae2a in WebCore::FractionalLayoutUnit::rawValue() const third_party/WebKit/Source/WebCore/platform/FractionalLayoutUnit.h:176
    #1 0x7f0ed7faac6a in FractionalLayoutUnit third_party/WebKit/Source/WebCore/platform/FractionalLayoutUnit.h:101
    #2 0x7f0ed7faaabf in FractionalLayoutUnit third_party/WebKit/Source/WebCore/platform/FractionalLayoutUnit.h:101
    #3 0x7f0ee40c3b23 in WebCore::RenderLayer::staticInlinePosition() const third_party/WebKit/Source/WebCore/rendering/RenderLayer.h:586
    #4 0x7f0ee4080dfb in WebCore::computeInlineStaticDistance(WebCore::Length&, WebCore::Length&, WebCore::RenderBox const*, WebCore::RenderBoxModelObject const*, WebCore::FractionalLayoutUnit, WebCore::RenderRegion*) third_party/WebKit/Source/WebCore/rendering/RenderBox.cpp:2519
    #5 0x7f0ee405c26b in WebCore::RenderBox::computePositionedLogicalWidth(WebCore::RenderBox::LogicalExtentComputedValues&, WebCore::RenderRegion*, WebCore::FractionalLayoutUnit) const third_party/WebKit/Source/WebCore/rendering/RenderBox.cpp:2635
    #6 0x7f0ee405747e in WebCore::RenderBox::computeLogicalWidthInRegion(WebCore::RenderBox::LogicalExtentComputedValues&, WebCore::RenderRegion*, WebCore::FractionalLayoutUnit) const third_party/WebKit/Source/WebCore/rendering/RenderBox.cpp:1652
    #7 0x7f0ee4055e28 in WebCore::RenderBox::updateLogicalWidth() third_party/WebKit/Source/WebCore/rendering/RenderBox.cpp:1634
    #8 0x7f0ee421dd85 in WebCore::RenderFlexibleBox::layoutBlock(bool, WebCore::FractionalLayoutUnit) third_party/WebKit/Source/WebCore/rendering/RenderFlexibleBox.cpp:303
    #9 0x7f0ee3d7d87d in WebCore::RenderBlock::layout() third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1383
    #10 0x7f0ee49a49b7 in WebCore::RenderMathMLRoot::layout() third_party/WebKit/Source/WebCore/rendering/mathml/RenderMathMLRoot.cpp:149
    #11 0x7f0ee3c47430 in WebCore::RenderObject::layoutIfNeeded() third_party/WebKit/Source/WebCore/rendering/RenderObject.h:671
    #12 0x7f0ee498e03e in WebCore::RenderMathMLBlock::computeChildrenPreferredLogicalHeights() third_party/WebKit/Source/WebCore/rendering/mathml/RenderMathMLBlock.cpp:183
    #13 0x7f0ee49a77cb in WebCore::RenderMathMLRow::computePreferredLogicalWidths() third_party/WebKit/Source/WebCore/rendering/mathml/RenderMathMLRow.cpp:57
    #14 0x7f0ee49a8633 in WebCore::RenderMathMLRow::layout() third_party/WebKit/Source/WebCore/rendering/mathml/RenderMathMLRow.cpp:92
    #15 0x7f0ee3c47430 in WebCore::RenderObject::layoutIfNeeded() third_party/WebKit/Source/WebCore/rendering/RenderObject.h:671
    #16 0x7f0ee3faa25c in WebCore::RenderBlock::layoutInlineChildren(bool, WebCore::FractionalLayoutUnit&, WebCore::FractionalLayoutUnit&) third_party/WebKit/Source/WebCore/rendering/RenderBlockLineLayout.cpp:1700
    #17 0x7f0ee3d81cc5 in WebCore::RenderBlock::layoutBlock(bool, WebCore::FractionalLayoutUnit) third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1555
    #18 0x7f0ee3d7d87d in WebCore::RenderBlock::layout() third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1383
    #19 0x7f0ee4b4ca90 in WebCore::RenderSVGForeignObject::layout() third_party/WebKit/Source/WebCore/rendering/svg/RenderSVGForeignObject.cpp:156
    #20 0x7f0ee4cedb58 in WebCore::SVGRenderSupport::layoutChildren(WebCore::RenderObject*, bool) third_party/WebKit/Source/WebCore/rendering/svg/SVGRenderSupport.cpp:243
    #21 0x7f0ee4b51dff in WebCore::RenderSVGHiddenContainer::layout() third_party/WebKit/Source/WebCore/rendering/svg/RenderSVGHiddenContainer.cpp:38
    #22 0x7f0ee4ba78df in WebCore::RenderSVGResourceContainer::layout() third_party/WebKit/Source/WebCore/rendering/svg/RenderSVGResourceContainer.cpp:61
    #23 0x7f0ee4cedb58 in WebCore::SVGRenderSupport::layoutChildren(WebCore::RenderObject*, bool) third_party/WebKit/Source/WebCore/rendering/svg/SVGRenderSupport.cpp:243
    #24 0x7f0ee4c5c4d1 in WebCore::RenderSVGRoot::layout() third_party/WebKit/Source/WebCore/rendering/svg/RenderSVGRoot.cpp:238
    #25 0x7f0ee3c47430 in WebCore::RenderObject::layoutIfNeeded() third_party/WebKit/Source/WebCore/rendering/RenderObject.h:671
    #26 0x7f0ee3faa25c in WebCore::RenderBlock::layoutInlineChildren(bool, WebCore::FractionalLayoutUnit&, WebCore::FractionalLayoutUnit&) third_party/WebKit/Source/WebCore/rendering/RenderBlockLineLayout.cpp:1700
    #27 0x7f0ee3d81cc5 in WebCore::RenderBlock::layoutBlock(bool, WebCore::FractionalLayoutUnit) third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1555
    #28 0x7f0ee3d7d87d in WebCore::RenderBlock::layout() third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1383
    #29 0x7f0ee3db1fb7 in WebCore::RenderBlock::layoutBlockChild(WebCore::RenderBox*, WebCore::RenderBlock::MarginInfo&, WebCore::FractionalLayoutUnit&, WebCore::FractionalLayoutUnit&) third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:2485
    #30 0x7f0ee3d8aa7f in WebCore::RenderBlock::layoutBlockChildren(bool, WebCore::FractionalLayoutUnit&) third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:2421
    #31 0x7f0ee3d81d46 in WebCore::RenderBlock::layoutBlock(bool, WebCore::FractionalLayoutUnit) third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1557
    #32 0x7f0ee3d7d87d in WebCore::RenderBlock::layout() third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1383
    #33 0x7f0ee3db1fb7 in WebCore::RenderBlock::layoutBlockChild(WebCore::RenderBox*, WebCore::RenderBlock::MarginInfo&, WebCore::FractionalLayoutUnit&, WebCore::FractionalLayoutUnit&) third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:2485
    #34 0x7f0ee3d8aa7f in WebCore::RenderBlock::layoutBlockChildren(bool, WebCore::FractionalLayoutUnit&) third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:2421
    #35 0x7f0ee3d81d46 in WebCore::RenderBlock::layoutBlock(bool, WebCore::FractionalLayoutUnit) third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1557
    #36 0x7f0ee3d7d87d in WebCore::RenderBlock::layout() third_party/WebKit/Source/WebCore/rendering/RenderBlock.cpp:1383
    #37 0x7f0ee48adc9e in WebCore::RenderView::layoutContent(WebCore::LayoutState const&) third_party/WebKit/Source/WebCore/rendering/RenderView.cpp:140
    #38 0x7f0ee48afc32 in WebCore::RenderView::layout() third_party/WebKit/Source/WebCore/rendering/RenderView.cpp:197
    #39 0x7f0ee344c8f0 in WebCore::FrameView::layout(bool) third_party/WebKit/Source/WebCore/page/FrameView.cpp:1191
    #40 0x7f0edcffd444 in WebCore::Document::implicitClose() third_party/WebKit/Source/WebCore/dom/Document.cpp:2542
    #41 0x7f0ee2e9588a in WebCore::FrameLoader::checkCallImplicitClose() third_party/WebKit/Source/WebCore/loader/FrameLoader.cpp:811
    #42 0x7f0ee2e946f2 in WebCore::FrameLoader::checkCompleted() third_party/WebKit/Source/WebCore/loader/FrameLoader.cpp:754
    #43 0x7f0ee2e9014f in WebCore::FrameLoader::finishedParsing() third_party/WebKit/Source/WebCore/loader/FrameLoader.cpp:687
    #44 0x7f0edd02fe1a in WebCore::Document::finishedParsing() third_party/WebKit/Source/WebCore/dom/Document.cpp:4530
    #45 0x7f0edef90f8f in WebCore::HTMLTreeBuilder::finished() third_party/WebKit/Source/WebCore/html/parser/HTMLTreeBuilder.cpp:2701
    #46 0x7f0edeea7e3e in WebCore::HTMLDocumentParser::end() third_party/WebKit/Source/WebCore/html/parser/HTMLDocumentParser.cpp:372
    #47 0x7f0edeea4e5d in WebCore::HTMLDocumentParser::attemptToRunDeferredScriptsAndEnd() third_party/WebKit/Source/WebCore/html/parser/HTMLDocumentParser.cpp:381
    #48 0x7f0edeea46ff in WebCore::HTMLDocumentParser::prepareToStopParsing() third_party/WebKit/Source/WebCore/html/parser/HTMLDocumentParser.cpp:149
    #49 0x7f0edeea8039 in WebCore::HTMLDocumentParser::attemptToEnd() third_party/WebKit/Source/WebCore/html/parser/HTMLDocumentParser.cpp:393
    #50 0x7f0edeea817d in WebCore::HTMLDocumentParser::finish() third_party/WebKit/Source/WebCore/html/parser/HTMLDocumentParser.cpp:420
    #51 0x7f0ee2e203e4 in WebCore::DocumentWriter::end() third_party/WebKit/Source/WebCore/loader/DocumentWriter.cpp:244
    #52 0x7f0ee2d8abe8 in WebCore::DocumentLoader::finishedLoading() third_party/WebKit/Source/WebCore/loader/DocumentLoader.cpp:299
    #53 0x7f0ee2f3be65 in WebCore::MainResourceLoader::didFinishLoading(double) third_party/WebKit/Source/WebCore/loader/MainResourceLoader.cpp:525
    #54 0x7f0ee2fcef6d in WebCore::ResourceLoader::didFinishLoading(WebCore::ResourceHandle*, double) third_party/WebKit/Source/WebCore/loader/ResourceLoader.cpp:442
    #55 0x7f0edfe13fd1 in WebCore::ResourceHandleInternal::didFinishLoading(WebKit::WebURLLoader*, double) third_party/WebKit/Source/WebCore/platform/network/chromium/ResourceHandle.cpp:156
    #56 0x7f0ef116b8db in webkit_glue::WebURLLoaderImpl::Context::OnCompletedRequest(int, bool, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, base::TimeTicks const&) webkit/glue/weburlloader_impl.cc:672
    #57 0x7f0ef9e77f48 in content::ResourceDispatcher::OnRequestComplete(int, int, bool, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, base::TimeTicks const&) content/common/resource_dispatcher.cc:464
    #58 0x7f0ef9e85053 in void DispatchToMethod<content::ResourceDispatcher, void (content::ResourceDispatcher::*)(int, int, bool, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, base::TimeTicks const&), int, int, bool, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, base::TimeTicks>(content::ResourceDispatcher*, void (content::ResourceDispatcher::*)(int, int, bool, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, base::TimeTicks const&), Tuple5<int, int, bool, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, base::TimeTicks> const&) ./base/tuple.h:571
    #59 0x7f0ef9e821bd in bool ResourceMsg_RequestComplete::Dispatch<content::ResourceDispatcher, content::ResourceDispatcher, void (content::ResourceDispatcher::*)(int, int, bool, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, base::TimeTicks const&)>(IPC::Message const*, content::ResourceDispatcher*, content::ResourceDispatcher*, void (content::ResourceDispatcher::*)(int, int, bool, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, base::TimeTicks const&)) ./content/common/resource_messages.h:245
    #60 0x7f0ef9e6eb74 in content::ResourceDispatcher::DispatchMessage(IPC::Message const&) content/common/resource_dispatcher.cc:557
    #61 0x7f0ef9e6bcf9 in content::ResourceDispatcher::OnMessageReceived(IPC::Message const&) content/common/resource_dispatcher.cc:271
    #62 0x7f0ef90f8ebb in ChildThread::OnMessageReceived(IPC::Message const&) content/common/child_thread.cc:242
    #63 0x7f0ef6c04e72 in IPC::ChannelProxy::Context::OnDispatchMessage(IPC::Message const&) ipc/ipc_channel_proxy.cc:261
    #64 0x7f0ef6c2c141 in base::internal::RunnableAdapter<void (IPC::ChannelProxy::Context::*)(IPC::Message const&)>::Run(IPC::ChannelProxy::Context*, IPC::Message const&) ./base/bind_internal.h:190
    #65 0x7f0ef6c2bcd7 in base::internal::InvokeHelper<false, void, base::internal::RunnableAdapter<void (IPC::ChannelProxy::Context::*)(IPC::Message const&)>, void (IPC::ChannelProxy::Context* const&, IPC::Message const&)>::MakeItSo(base::internal::RunnableAdapter<void (IPC::ChannelProxy::Context::*)(IPC::Message const&)>, IPC::ChannelProxy::Context* const&, IPC::Message const&) ./base/bind_internal.h:898
    #66 0x7f0ef6c2b904 in base::internal::Invoker<2, base::internal::BindState<base::internal::RunnableAdapter<void (IPC::ChannelProxy::Context::*)(IPC::Message const&)>, void (IPC::ChannelProxy::Context*, IPC::Message const&), void (IPC::ChannelProxy::Context*, IPC::Message)>, void (IPC::ChannelProxy::Context*, IPC::Message const&)>::Run(base::internal::BindStateBase*) ./base/bind_internal.h:1256
    #67 0x7f0f08b0254c in base::Callback<void ()>::Run() const ./base/callback.h:391
    #68 0x7f0f08d1fcad in MessageLoop::RunTask(base::PendingTask const&) base/message_loop.cc:470
    #69 0x7f0f08d21b1a in MessageLoop::DeferOrRunPendingTask(base::PendingTask const&) base/message_loop.cc:482
    #70 0x7f0f08d221d5 in MessageLoop::DoWork() base/message_loop.cc:661
    #71 0x7f0f08d7397b in base::MessagePumpDefault::Run(base::MessagePump::Delegate*) base/message_pump_default.cc:28
    #72 0x7f0f08d1ded9 in MessageLoop::RunInternal() base/message_loop.cc:427
    #73 0x7f0f08d1d966 in MessageLoop::RunHandler() base/message_loop.cc:400
    #74 0x7f0f08ee8fe1 in base::RunLoop::Run() base/run_loop.cc:45
    #75 0x7f0f08d1b5ea in MessageLoop::Run() base/message_loop.cc:307
    #76 0x7f0f0912b60c in base::Thread::Run(MessageLoop*) base/threading/thread.cc:133
    #77 0x7f0f0912bd77 in base::Thread::ThreadMain() base/threading/thread.cc:169
    #78 0x7f0f090c303e in base::(anonymous namespace)::ThreadFunc(void*) base/threading/platform_thread_posix.cc:65
    #79 0x7f0f178d68ca in __asan::AsanThread::ThreadStart() 
Thread T16 created by T0 here:
    #0 0x7f0f178cff24 in __interceptor_pthread_create 
    #1 0x7f0f090c1e0c in base::(anonymous namespace)::CreateThread(unsigned long, bool, base::PlatformThread::Delegate*, unsigned long*, base::ThreadPriority) base/threading/platform_thread_posix.cc:127
    #2 0x7f0f090c15e7 in base::PlatformThread::Create(unsigned long, base::PlatformThread::Delegate*, unsigned long*) base/threading/platform_thread_posix.cc:247
    #3 0x7f0f0912a749 in base::Thread::StartWithOptions(base::Thread::Options const&) base/threading/thread.cc:74
    #4 0x7f0ef87ec082 in content::RenderProcessHostImpl::Init() content/browser/renderer_host/render_process_host_impl.cc:496
    #5 0x7f0ef8896efc in content::RenderViewHostImpl::CreateRenderView(std::basic_string<unsigned short, base::string16_char_traits, std::allocator<unsigned short> > const&, int, int, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, int) content/browser/renderer_host/render_view_host_impl.cc:238
    #6 0x7f0ef8eaebdc in WebContentsImpl::CreateRenderViewForRenderManager(content::RenderViewHost*, int) content/browser/web_contents/web_contents_impl.cc:3314
    #7 0x7f0ef8eaf114 in non-virtual thunk to WebContentsImpl::CreateRenderViewForRenderManager(content::RenderViewHost*, int) content/browser/web_contents/web_contents_impl.cc:3333
    #8 0x7f0ef8e213fb in RenderViewHostManager::InitRenderView(content::RenderViewHost*, int) content/browser/web_contents/render_view_host_manager.cc:675
    #9 0x7f0ef8e1d746 in RenderViewHostManager::Navigate(content::NavigationEntryImpl const&) content/browser/web_contents/render_view_host_manager.cc:129
    #10 0x7f0ef8e84a4a in WebContentsImpl::NavigateToEntry(content::NavigationEntryImpl const&, content::NavigationController::ReloadType) content/browser/web_contents/web_contents_impl.cc:1598
    #11 0x7f0ef8e843ef in WebContentsImpl::NavigateToPendingEntry(content::NavigationController::ReloadType) content/browser/web_contents/web_contents_impl.cc:1579
    #12 0x7f0ef8dc8941 in NavigationControllerImpl::NavigateToPendingEntry(content::NavigationController::ReloadType) content/browser/web_contents/navigation_controller_impl.cc:1495
    #13 0x7f0ef8dcac67 in NavigationControllerImpl::LoadEntry(content::NavigationEntryImpl*) content/browser/web_contents/navigation_controller_impl.cc:414
    #14 0x7f0ef8dd3ca6 in NavigationControllerImpl::LoadURLWithParams(content::NavigationController::LoadURLParams const&) content/browser/web_contents/navigation_controller_impl.cc:700
    #15 0x7f0f13679d08 in (anonymous namespace)::LoadURLInContents(content::WebContents*, GURL const&, chrome::NavigateParams*) chrome/browser/ui/browser_navigator.cc:238
    #16 0x7f0f136740aa in chrome::Navigate(chrome::NavigateParams*) chrome/browser/ui/browser_navigator.cc:501
    #17 0x7f0f13cd057b in StartupBrowserCreatorImpl::OpenTabsInBrowser(Browser*, bool, std::vector<StartupTab, std::allocator<StartupTab> > const&) chrome/browser/ui/startup/startup_browser_creator_impl.cc:862
    #18 0x7f0f13cca02c in StartupBrowserCreatorImpl::ProcessSpecifiedURLs(std::vector<GURL, std::allocator<GURL> > const&) chrome/browser/ui/startup/startup_browser_creator_impl.cc:757
    #19 0x7f0f13cc8e04 in StartupBrowserCreatorImpl::ProcessStartupURLs(std::vector<GURL, std::allocator<GURL> > const&) chrome/browser/ui/startup/startup_browser_creator_impl.cc:698
    #20 0x7f0f13cc3571 in StartupBrowserCreatorImpl::ProcessLaunchURLs(bool, std::vector<GURL, std::allocator<GURL> > const&) chrome/browser/ui/startup/startup_browser_creator_impl.cc:585
    #21 0x7f0f13cbd1d9 in StartupBrowserCreatorImpl::Launch(Profile*, std::vector<GURL, std::allocator<GURL> > const&, bool) chrome/browser/ui/startup/startup_browser_creator_impl.cc:388
    #22 0x7f0f13c9e149 in StartupBrowserCreator::LaunchBrowser(CommandLine const&, Profile*, FilePath const&, chrome::startup::IsProcessStartup, chrome::startup::IsFirstRun, int*) chrome/browser/ui/startup/startup_browser_creator.cc:201
    #23 0x7f0f13ca43d3 in StartupBrowserCreator::ProcessCmdLineImpl(CommandLine const&, FilePath const&, bool, Profile*, std::vector<Profile*, std::allocator<Profile*> > const&, int*, StartupBrowserCreator*) chrome/browser/ui/startup/startup_browser_creator.cc:481
    #24 0x7f0f0ccc1b4a in StartupBrowserCreator::Start(CommandLine const&, FilePath const&, Profile*, std::vector<Profile*, std::allocator<Profile*> > const&, int*) ./chrome/browser/ui/startup/startup_browser_creator.h:46
    #25 0x7f0f0ccb53b8 in ChromeBrowserMainParts::PreMainMessageLoopRunImpl() chrome/browser/chrome_browser_main.cc:1401
    #26 0x7f0f0ccb117e in ChromeBrowserMainParts::PreMainMessageLoopRun() chrome/browser/chrome_browser_main.cc:902
    #27 0x7f0ef747666e in content::BrowserMainLoop::CreateThreads() content/browser/browser_main_loop.cc:449
    #28 0x7f0ef7490651 in (anonymous namespace)::BrowserMainRunnerImpl::Initialize(content::MainFunctionParams const&) content/browser/browser_main_runner.cc:109
    #29 0x7f0ef74716c9 in BrowserMain(content::MainFunctionParams const&) content/browser/browser_main.cc:17
    #30 0x7f0ef73229db in content::RunNamedProcessTypeMain(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, content::MainFunctionParams const&, content::ContentMainDelegate*) content/app/content_main_runner.cc:448
    #31 0x7f0ef7327ebb in content::ContentMainRunnerImpl::Run() content/app/content_main_runner.cc:741
    #32 0x7f0ef731f3bd in content::ContentMain(int, char const**, content::ContentMainDelegate*) content/app/content_main.cc:35
    #33 0x7f0f0a07af9d in ChromeMain chrome/app/chrome_main.cc:32
    #34 0x7f0f0a07ac6a in main chrome/app/chrome_exe_main_gtk.cc:31
    #35 0x7f0eca45176c in __libc_start_main /build/buildd/eglibc-2.15/csu/libc-start.c:226
Stats: 64M malloced (309M for red zones) by 338171 calls
Stats: 1M realloced by 5921 calls
Stats: 54M freed by 262144 calls
Stats: 2M really freed by 24993 calls
Stats: 376M (96271 full pages) mmaped in 94 calls
  mmaps   by size class: 10:311220; 11:6141; 12:3072; 13:1024; 14:512; 15:128; 16:256; 17:32; 18:16; 19:8;
  mallocs by size class: 10:330760; 11:3780; 12:2312; 13:566; 14:374; 15:130; 16:210; 17:23; 18:14; 19:2;
  frees   by size class: 10:256038; 11:3197; 12:1882; 13:423; 14:330; 15:72; 16:178; 17:13; 18:9; 19:2;
  rfrees  by size class: 10:24677; 11:173; 12:100; 13:24; 14:1; 15:14; 16:4;
Stats: malloc large: 39 small slow: 2984
==7926== ABORTING

[Eric Seidel (no email)]

Trying to access a null layer? 

I assume that m_staticInlinePosition is at offet 0xd8 from the start of the RenderLayer object:
http://trac.webkit.org/browser/trunk/Source/WebCore/rendering/RenderLayer.h#L586

This code clearly assumes that child has a layer. :)
http://trac.webkit.org/browser/trunk/Source/WebCore/rendering/RenderBox.cpp#L2526

Maybe the RenderMathMLRoot doesn't have a layer even though it's positioned?

[Eric Seidel (no email)]

What!?  This is MathML inside SVG??  Specifically inside an SVGHiddenContainer (which isn't rendered?)  Of course it doesn't have a layer!

This may be just another flex-box issue unearthed by MathML.

[Tony Chang]

Created attachment 170953 [details]
no mathml or flexbox

This doesn't seem to be specific to mathml or flexbox.  Here's a repro with a position:fixed div.

[Tony Chang]

*** This bug has been marked as a duplicate of bug 87297 ***

[Dave Barton]

Thanks very much Eric & Tony! I know little about layers or svg yet.