Assertion failure: aWM.IsVertical(), at /builds/worker/workspace/build/src/layout/generic/nsTextFrame.cpp:6661 Testcase found while fuzzing mozilla-central rev c5a9878baf35. rax = 0x0000000000000000 rdx = 0x0000000000000000 rcx = 0x0000000000000b40 rbx = 0x00007f6e9d07ede0 rsi = 0x00007f6eb70748b0 rdi = 0x00007f6eb7073680 rbp = 0x00007ffc2b2b1e00 rsp = 0x00007ffc2b2b1d50 r8 = 0x00007f6eb70748b0 r9 = 0x00007f6eb81ea740 r10 = 0x0000000000000000 r11 = 0x0000000000000000 r12 = 0x00007f6e9d07ed00 r13 = 0x00007f6e9d09b060 r14 = 0x00007ffc2b2b2188 r15 = 0x00007ffc2b2b20e8 rip = 0x00007f6ea7b2935b OS|Linux|0.0.0 Linux 4.15.0-34-generic #37-Ubuntu SMP Mon Aug 27 15:21:48 UTC 2018 x86_64 CPU|amd64|family 6 model 78 stepping 3|1 GPU||| Crash|SIGSEGV /SEGV_MAPERR|0x0|0 0|0|libxul.so|nsTextFrame::DrawEmphasisMarks(gfxContext*, mozilla::WritingMode, mozilla::gfx::PointTyped<mozilla::gfx::UnknownUnits, float> const&, mozilla::gfx::PointTyped<mozilla::gfx::UnknownUnits, float> const&, gfxTextRun::Range, unsigned int const*, PropertyProvider*)|hg:hg.mozilla.org/mozilla-central:layout/generic/nsTextFrame.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|6661|0x18 0|1|libxul.so|nsTextFrame::DrawTextRunAndDecorations(gfxTextRun::Range, mozilla::gfx::PointTyped<mozilla::gfx::UnknownUnits, float> const&, nsTextFrame::DrawTextParams const&, nsTextFrame::TextDecorations const&)|hg:hg.mozilla.org/mozilla-central:layout/generic/nsTextFrame.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|7341|0x26 0|2|libxul.so|nsTextFrame::DrawText(gfxTextRun::Range, mozilla::gfx::PointTyped<mozilla::gfx::UnknownUnits, float> const&, nsTextFrame::DrawTextParams const&)|hg:hg.mozilla.org/mozilla-central:layout/generic/nsTextFrame.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|7374|0x14 0|3|libxul.so|nsTextFrame::PaintOneShadow(nsTextFrame::PaintShadowParams const&, nsCSSShadowItem*, mozilla::gfx::RectTyped<mozilla::gfx::UnknownUnits, double>&, unsigned int)|hg:hg.mozilla.org/mozilla-central:layout/generic/nsTextFrame.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|6323|0xd 0|4|libxul.so|nsTextFrame::PaintShadows(nsCSSShadowArray*, nsTextFrame::PaintShadowParams const&)|hg:hg.mozilla.org/mozilla-central:layout/generic/nsTextFrame.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|6908|0x5 0|5|libxul.so|nsTextFrame::PaintText(nsTextFrame::PaintTextParams const&, nsCharClipDisplayItem const&, float)|hg:hg.mozilla.org/mozilla-central:layout/generic/nsTextFrame.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|7052|0xf 0|6|libxul.so|nsDisplayText::RenderToContext(gfxContext*, nsDisplayListBuilder*, bool)|hg:hg.mozilla.org/mozilla-central:layout/generic/nsTextFrame.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|5182|0x19 0|7|libxul.so|nsDisplayText::Paint(nsDisplayListBuilder*, gfxContext*)|hg:hg.mozilla.org/mozilla-central:layout/generic/nsTextFrame.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|5091|0x11 0|8|libxul.so|mozilla::FrameLayerBuilder::PaintItems(std::vector<mozilla::AssignedDisplayItem, std::allocator<mozilla::AssignedDisplayItem> >&, mozilla::gfx::IntRectTyped<mozilla::gfx::UnknownUnits> const&, gfxContext*, nsDisplayListBuilder*, nsPresContext*, mozilla::gfx::IntPointTyped<mozilla::gfx::UnknownUnits> const&, float, float)|hg:hg.mozilla.org/mozilla-central:layout/painting/FrameLayerBuilder.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|7445|0x1a 0|9|libxul.so|mozilla::FrameLayerBuilder::DrawPaintedLayer(mozilla::layers::PaintedLayer*, gfxContext*, mozilla::gfx::IntRegionTyped<mozilla::gfx::UnknownUnits> const&, mozilla::gfx::IntRegionTyped<mozilla::gfx::UnknownUnits> const&, mozilla::layers::DrawRegionClip, mozilla::gfx::IntRegionTyped<mozilla::gfx::UnknownUnits> const&, void*)|hg:hg.mozilla.org/mozilla-central:layout/painting/FrameLayerBuilder.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|7625|0x18 0|10|libxul.so|mozilla::layers::ClientPaintedLayer::RenderLayerWithReadback(mozilla::layers::ReadbackProcessor*)|hg:hg.mozilla.org/mozilla-central:gfx/layers/client/ClientPaintedLayer.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|166|0x2d 0|11|libxul.so|mozilla::layers::ClientContainerLayer::RenderLayer()|hg:hg.mozilla.org/mozilla-central:gfx/layers/client/ClientContainerLayer.h:c5a9878baf35a354cb913b4f06542e233685ea9a|58|0xd 0|12|libxul.so|mozilla::layers::ClientLayerManager::EndTransactionInternal(void (*)(mozilla::layers::PaintedLayer*, gfxContext*, mozilla::gfx::IntRegionTyped<mozilla::gfx::UnknownUnits> const&, mozilla::gfx::IntRegionTyped<mozilla::gfx::UnknownUnits> const&, mozilla::layers::DrawRegionClip, mozilla::gfx::IntRegionTyped<mozilla::gfx::UnknownUnits> const&, void*), void*, mozilla::layers::LayerManager::EndTransactionFlags)|hg:hg.mozilla.org/mozilla-central:gfx/layers/client/ClientLayerManager.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|331|0xa 0|13|libxul.so|mozilla::layers::ClientLayerManager::EndTransaction(void (*)(mozilla::layers::PaintedLayer*, gfxContext*, mozilla::gfx::IntRegionTyped<mozilla::gfx::UnknownUnits> const&, mozilla::gfx::IntRegionTyped<mozilla::gfx::UnknownUnits> const&, mozilla::layers::DrawRegionClip, mozilla::gfx::IntRegionTyped<mozilla::gfx::UnknownUnits> const&, void*), void*, mozilla::layers::LayerManager::EndTransactionFlags)|hg:hg.mozilla.org/mozilla-central:gfx/layers/client/ClientLayerManager.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|389|0x11 0|14|libxul.so|nsDisplayList::PaintRoot(nsDisplayListBuilder*, gfxContext*, unsigned int)|hg:hg.mozilla.org/mozilla-central:layout/painting/nsDisplayList.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|2834|0x17 0|15|libxul.so|nsLayoutUtils::PaintFrame(gfxContext*, nsIFrame*, nsRegion const&, unsigned int, nsDisplayListBuilderMode, nsLayoutUtils::PaintFrameFlags)|hg:hg.mozilla.org/mozilla-central:layout/base/nsLayoutUtils.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|3834|0x5 0|16|libxul.so|mozilla::PresShell::Paint(nsView*, nsRegion const&, unsigned int)|hg:hg.mozilla.org/mozilla-central:layout/base/PresShell.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|6345|0x17 0|17|libxul.so|nsViewManager::ProcessPendingUpdatesPaint(nsIWidget*)|hg:hg.mozilla.org/mozilla-central:view/nsViewManager.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|480|0x28 0|18|libxul.so|nsViewManager::ProcessPendingUpdatesForView(nsView*, bool)|hg:hg.mozilla.org/mozilla-central:view/nsViewManager.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|412|0xd 0|19|libxul.so|nsViewManager::ProcessPendingUpdates()|hg:hg.mozilla.org/mozilla-central:view/nsViewManager.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|1102|0x11 0|20|libxul.so|nsRefreshDriver::Tick(mozilla::TimeStamp)|hg:hg.mozilla.org/mozilla-central:layout/base/nsRefreshDriver.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|2046|0x8 0|21|libxul.so|mozilla::RefreshDriverTimer::TickRefreshDrivers(mozilla::TimeStamp, nsTArray<RefPtr<nsRefreshDriver> >&)|hg:hg.mozilla.org/mozilla-central:layout/base/nsRefreshDriver.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|325|0x8 0|22|libxul.so|mozilla::RefreshDriverTimer::Tick(mozilla::TimeStamp)|hg:hg.mozilla.org/mozilla-central:layout/base/nsRefreshDriver.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|318|0xc 0|23|libxul.so|mozilla::VsyncRefreshDriverTimer::RefreshDriverVsyncObserver::TickRefreshDriver(mozilla::TimeStamp)|hg:hg.mozilla.org/mozilla-central:layout/base/nsRefreshDriver.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|756|0xc 0|24|libxul.so|mozilla::VsyncRefreshDriverTimer::RefreshDriverVsyncObserver::NotifyVsync(mozilla::TimeStamp)|hg:hg.mozilla.org/mozilla-central:layout/base/nsRefreshDriver.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|572|0xc 0|25|libxul.so|mozilla::layout::VsyncChild::RecvNotify(mozilla::TimeStamp const&)|hg:hg.mozilla.org/mozilla-central:layout/ipc/VsyncChild.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|78|0x9 0|26|libxul.so|mozilla::layout::PVsyncChild::OnMessageReceived(IPC::Message const&)|s3:gecko-generated-sources:2c36fa176485b987fd1c1ce548d1f34c4c8bfdea36ff5dd016400feb13d3c5c0c7f99d5a56d13733937c9483a48617af010c09f521533a5ce0fc1f74c50b86a2/ipc/ipdl/PVsyncChild.cpp:|167|0xc 0|27|libxul.so|mozilla::ipc::MessageChannel::DispatchAsyncMessage(IPC::Message const&)|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessageChannel.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|2248|0x6 0|28|libxul.so|mozilla::ipc::MessageChannel::DispatchMessage(IPC::Message&&)|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessageChannel.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|2175|0xb 0|29|libxul.so|mozilla::ipc::MessageChannel::RunMessage(mozilla::ipc::MessageChannel::MessageTask&)|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessageChannel.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|2012|0xb 0|30|libxul.so|mozilla::ipc::MessageChannel::MessageTask::Run()|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessageChannel.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|2045|0xc 0|31|libxul.so|nsThread::ProcessNextEvent(bool, bool*)|hg:hg.mozilla.org/mozilla-central:xpcom/threads/nsThread.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|1166|0x15 0|32|libxul.so|NS_ProcessNextEvent(nsIThread*, bool)|hg:hg.mozilla.org/mozilla-central:xpcom/threads/nsThreadUtils.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|519|0x11 0|33|libxul.so|mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*)|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessagePump.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|97|0xa 0|34|libxul.so|MessageLoop::RunInternal()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:c5a9878baf35a354cb913b4f06542e233685ea9a|325|0x17 0|35|libxul.so|MessageLoop::Run()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:c5a9878baf35a354cb913b4f06542e233685ea9a|318|0x8 0|36|libxul.so|nsBaseAppShell::Run()|hg:hg.mozilla.org/mozilla-central:widget/nsBaseAppShell.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|158|0xd 0|37|libxul.so|XRE_RunAppShell()|hg:hg.mozilla.org/mozilla-central:toolkit/xre/nsEmbedFunctions.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|939|0x11 0|38|libxul.so|mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*)|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessagePump.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|269|0x5 0|39|libxul.so|MessageLoop::RunInternal()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:c5a9878baf35a354cb913b4f06542e233685ea9a|325|0x17 0|40|libxul.so|MessageLoop::Run()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:c5a9878baf35a354cb913b4f06542e233685ea9a|318|0x8 0|41|libxul.so|XRE_InitChildProcess(int, char**, XREChildData const*)|hg:hg.mozilla.org/mozilla-central:toolkit/xre/nsEmbedFunctions.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|765|0x8 0|42|firefox-bin|content_process_main(mozilla::Bootstrap*, int, char**)|hg:hg.mozilla.org/mozilla-central:ipc/contentproc/plugin-container.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|50|0x14 0|43|firefox-bin|main|hg:hg.mozilla.org/mozilla-central:browser/app/nsBrowserApp.cpp:c5a9878baf35a354cb913b4f06542e233685ea9a|287|0x11 0|44|libc-2.27.so||||0x21b97 0|45|firefox-bin|MOZ_ReportAssertionFailure|hg:hg.mozilla.org/mozilla-central:mfbt/Assertions.h:c5a9878baf35a354cb913b4f06542e233685ea9a|164|0x5

Link to assertion in source: https://searchfox.org/mozilla-central/rev/ce57be88b8aa2ad03ace1b9684cd6c361be5109f/layout/generic/nsTextFrame.cpp#6661 The assertion was added here in Bug 1097499: https://hg.mozilla.org/mozilla-central/rev/660f1684ab37d18791bd03f6121813f6f3b2a449#l1.130

Avoiding this assertion is easy, but what is the right way to do is unclear.

Comment on attachment 9012479 [details] Bug 1494380 - Ignore emphasis marks on combined text with horizontal writing mode. r=jfkthame Jonathan Kew (:jfkthame) has approved the revision.

Pushed by xquan@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/69fe889aa92a Ignore emphasis marks on combined text with horizontal writing mode. r=jfkthame