Assertion failure: foundOwnPushedChild || !items.IsEmpty() || mDidPushItemsBitMayLie (NS_STATE_GRID_DID_PUSH_ITEMS lied), at src/layout/generic/nsGridContainerFrame.cpp:6997

#0 nsGridContainerFrame::NormalizeChildLists() src/layout/generic/nsGridContainerFrame.cpp:6995:5
#1 nsGridContainerFrame::IntrinsicISize(gfxContext*, nsLayoutUtils::IntrinsicISizeType) src/layout/generic/nsGridContainerFrame.cpp:7527:3
#2 nsGridContainerFrame::GetMinISize(gfxContext*) src/layout/generic/nsGridContainerFrame.cpp:7587:29
#3 nsFrame::ShrinkWidthToFit(gfxContext*, int, nsIFrame::ComputeSizeFlags) src/layout/generic/nsFrame.cpp:6376:22
#4 nsContainerFrame::ComputeAutoSize(gfxContext*, mozilla::WritingMode, mozilla::LogicalSize const&, int, mozilla::LogicalSize const&, mozilla::LogicalSize const&, mozilla::LogicalSize const&, nsIFrame::ComputeSizeFlags) src/layout/generic/nsContainerFrame.cpp:811:11
#5 nsFrame::ComputeSize(gfxContext*, mozilla::WritingMode, mozilla::LogicalSize const&, int, mozilla::LogicalSize const&, mozilla::LogicalSize const&, mozilla::LogicalSize const&, nsIFrame::ComputeSizeFlags) src/layout/generic/nsFrame.cpp:5673:7
#6 mozilla::ReflowInput::InitAbsoluteConstraints(nsPresContext*, mozilla::ReflowInput const*, mozilla::LogicalSize const&, mozilla::LayoutFrameType) src/layout/generic/ReflowInput.cpp:1742:28
#7 mozilla::ReflowInput::InitConstraints(nsPresContext*, mozilla::Maybe<mozilla::LogicalSize> const&, nsMargin const*, nsMargin const*, mozilla::LayoutFrameType) src/layout/generic/ReflowInput.cpp:2381:7
#8 mozilla::ReflowInput::Init(nsPresContext*, mozilla::Maybe<mozilla::LogicalSize> const&, nsMargin const*, nsMargin const*) src/layout/generic/ReflowInput.cpp:353:3
#9 mozilla::ReflowInput::ReflowInput(nsPresContext*, mozilla::ReflowInput const&, nsIFrame*, mozilla::LogicalSize const&, mozilla::Maybe<mozilla::LogicalSize> const&, unsigned int) src/layout/generic/ReflowInput.cpp:227:5
#10 nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame*, nsPresContext*, mozilla::ReflowInput const&, nsRect const&, nsAbsoluteContainingBlock::AbsPosReflowFlags, nsIFrame*, nsReflowStatus&, nsOverflowAreas*) src/layout/generic/nsAbsoluteContainingBlock.cpp:656:15
#11 nsAbsoluteContainingBlock::Reflow(nsContainerFrame*, nsPresContext*, mozilla::ReflowInput const&, nsReflowStatus&, nsRect const&, nsAbsoluteContainingBlock::AbsPosReflowFlags, nsOverflowAreas*) src/layout/generic/nsAbsoluteContainingBlock.cpp:161:7
#12 nsFrame::ReflowAbsoluteFrames(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&, bool) src/layout/generic/nsFrame.cpp:6524:24
#13 nsFrame::FinishReflowWithAbsoluteFrames(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&, bool) src/layout/generic/nsFrame.cpp:6491:3
#14 nsHTMLButtonControlFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) src/layout/forms/nsHTMLButtonControlFrame.cpp:192:3
#15 nsBlockReflowContext::ReflowBlock(mozilla::LogicalRect const&, bool, nsCollapsingMargin&, int, bool, nsLineBox*, mozilla::ReflowInput&, nsReflowStatus&, mozilla::BlockReflowInput&) src/layout/generic/nsBlockReflowContext.cpp:297:11
#16 nsBlockFrame::ReflowBlockFrame(mozilla::BlockReflowInput&, nsLineList_iterator, bool*) src/layout/generic/nsBlockFrame.cpp:3628:11
#17 nsBlockFrame::ReflowLine(mozilla::BlockReflowInput&, nsLineList_iterator, bool*) src/layout/generic/nsBlockFrame.cpp:2992:5
#18 nsBlockFrame::ReflowDirtyLines(mozilla::BlockReflowInput&) src/layout/generic/nsBlockFrame.cpp:2536:7
#19 nsBlockFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) src/layout/generic/nsBlockFrame.cpp:1285:3
#20 nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) src/layout/generic/nsContainerFrame.cpp:894:14
#21 nsColumnSetFrame::ReflowChildren(mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&, nsColumnSetFrame::ReflowConfig const&, bool) src/layout/generic/nsColumnSetFrame.cpp:766:7
#22 nsColumnSetFrame::ReflowColumns(mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&, nsColumnSetFrame::ReflowConfig&, bool) src/layout/generic/nsColumnSetFrame.cpp:448:37
#23 nsColumnSetFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) src/layout/generic/nsColumnSetFrame.cpp:1229:37
#24 nsBlockReflowContext::ReflowBlock(mozilla::LogicalRect const&, bool, nsCollapsingMargin&, int, bool, nsLineBox*, mozilla::ReflowInput&, nsReflowStatus&, mozilla::BlockReflowInput&) src/layout/generic/nsBlockReflowContext.cpp:297:11
#25 nsBlockFrame::ReflowBlockFrame(mozilla::BlockReflowInput&, nsLineList_iterator, bool*) src/layout/generic/nsBlockFrame.cpp:3628:11
#26 nsBlockFrame::ReflowLine(mozilla::BlockReflowInput&, nsLineList_iterator, bool*) src/layout/generic/nsBlockFrame.cpp:2992:5
#27 nsBlockFrame::ReflowDirtyLines(mozilla::BlockReflowInput&) src/layout/generic/nsBlockFrame.cpp:2536:7
#28 nsBlockFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) src/layout/generic/nsBlockFrame.cpp:1285:3
#29 nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) src/layout/generic/nsContainerFrame.cpp:894:14
#30 nsFlexContainerFrame::ReflowFlexItem(nsPresContext*, nsFlexContainerFrame::FlexboxAxisTracker const&, mozilla::ReflowInput const&, nsFlexContainerFrame::FlexItem const&, mozilla::LogicalPoint&, nsSize const&, bool) src/layout/generic/nsFlexContainerFrame.cpp:5201:3
#31 nsFlexContainerFrame::DoFlexLayout(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&, int, int, nsTArray<nsFlexContainerFrame::StrutInfo>&, nsFlexContainerFrame::FlexboxAxisTracker const&, int, int, bool) src/layout/generic/nsFlexContainerFrame.cpp:4947:9
#32 nsFlexContainerFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) src/layout/generic/nsFlexContainerFrame.cpp:4355:3
#33 nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) src/layout/generic/nsContainerFrame.cpp:894:14
#34 nsCanvasFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) src/layout/generic/nsCanvasFrame.cpp:730:5
#35 nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, mozilla::WritingMode const&, mozilla::LogicalPoint const&, nsSize const&, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) src/layout/generic/nsContainerFrame.cpp:894:14
#36 nsHTMLScrollFrame::ReflowScrolledFrame(mozilla::ScrollReflowInput*, bool, bool, mozilla::ReflowOutput*) src/layout/generic/nsGfxScrollFrame.cpp:625:3
#37 nsHTMLScrollFrame::ReflowContents(mozilla::ScrollReflowInput*, mozilla::ReflowOutput const&) src/layout/generic/nsGfxScrollFrame.cpp:738:3
#38 nsHTMLScrollFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) src/layout/generic/nsGfxScrollFrame.cpp:1140:3
#39 nsContainerFrame::ReflowChild(nsIFrame*, nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, int, int, unsigned int, nsReflowStatus&, nsOverflowContinuationTracker*) src/layout/generic/nsContainerFrame.cpp:933:14
#40 mozilla::ViewportFrame::Reflow(nsPresContext*, mozilla::ReflowOutput&, mozilla::ReflowInput const&, nsReflowStatus&) src/layout/generic/ViewportFrame.cpp:307:7
#41 mozilla::PresShell::DoReflow(nsIFrame*, bool, mozilla::OverflowChangedTracker*) src/layout/base/PresShell.cpp:9301:11
#42 mozilla::PresShell::ProcessReflowCommands(bool) src/layout/base/PresShell.cpp:9471:24
#43 mozilla::PresShell::DoFlushPendingNotifications(mozilla::ChangesToFlush) src/layout/base/PresShell.cpp:4238:11
#44 nsRefreshDriver::Tick(mozilla::layers::BaseTransactionId<mozilla::VsyncIdType>, mozilla::TimeStamp) src/layout/base/nsRefreshDriver.cpp:1986:20
#45 mozilla::RefreshDriverTimer::TickRefreshDrivers(mozilla::layers::BaseTransactionId<mozilla::VsyncIdType>, mozilla::TimeStamp, nsTArray<RefPtr<nsRefreshDriver> >&) src/layout/base/nsRefreshDriver.cpp:327:7
#46 mozilla::RefreshDriverTimer::Tick(mozilla::layers::BaseTransactionId<mozilla::VsyncIdType>, mozilla::TimeStamp) src/layout/base/nsRefreshDriver.cpp:344:5
#47 mozilla::VsyncRefreshDriverTimer::RefreshDriverVsyncObserver::TickRefreshDriver(mozilla::layers::BaseTransactionId<mozilla::VsyncIdType>, mozilla::TimeStamp) src/layout/base/nsRefreshDriver.cpp:710:16
#48 mozilla::VsyncRefreshDriverTimer::RefreshDriverVsyncObserver::NotifyVsync(mozilla::VsyncEvent const&) src/layout/base/nsRefreshDriver.cpp:605:9
#49 mozilla::layout::VsyncChild::RecvNotify(mozilla::VsyncEvent const&) src/layout/ipc/VsyncChild.cpp:65:16
#50 mozilla::layout::PVsyncChild::OnMessageReceived(IPC::Message const&) src/obj-firefox/ipc/ipdl/PVsyncChild.cpp:187:54
#51 mozilla::ipc::PBackgroundChild::OnMessageReceived(IPC::Message const&) src/obj-firefox/ipc/ipdl/PBackgroundChild.cpp:4821:32
#52 mozilla::ipc::MessageChannel::DispatchAsyncMessage(mozilla::ipc::ActorLifecycleProxy*, IPC::Message const&) src/ipc/glue/MessageChannel.cpp:2158:25
#53 mozilla::ipc::MessageChannel::DispatchMessage(IPC::Message&&) src/ipc/glue/MessageChannel.cpp:2082:9
#54 mozilla::ipc::MessageChannel::RunMessage(mozilla::ipc::MessageChannel::MessageTask&) src/ipc/glue/MessageChannel.cpp:1939:3
#55 mozilla::ipc::MessageChannel::MessageTask::Run() src/ipc/glue/MessageChannel.cpp:1970:13
#56 nsThread::ProcessNextEvent(bool, bool*) src/xpcom/threads/nsThread.cpp:1225:14
#57 NS_ProcessNextEvent(nsIThread*, bool) src/xpcom/threads/nsThreadUtils.cpp:486:10
#58 mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) src/ipc/glue/MessagePump.cpp:88:21
#59 MessageLoop::RunInternal() src/ipc/chromium/src/base/message_loop.cc:315:10
#60 MessageLoop::Run() src/ipc/chromium/src/base/message_loop.cc:290:3
#61 nsBaseAppShell::Run() src/widget/nsBaseAppShell.cpp:137:27
#62 XRE_RunAppShell() src/toolkit/xre/nsEmbedFunctions.cpp:919:20
#63 mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*) src/ipc/glue/MessagePump.cpp:238:9
#64 MessageLoop::RunInternal() src/ipc/chromium/src/base/message_loop.cc:315:10
#65 MessageLoop::Run() src/ipc/chromium/src/base/message_loop.cc:290:3
#66 XRE_InitChildProcess(int, char**, XREChildData const*) src/toolkit/xre/nsEmbedFunctions.cpp:754:34
#67 content_process_main(mozilla::Bootstrap*, int, char**) src/browser/app/../../ipc/contentproc/plugin-container.cpp:56:28
#68 main src/browser/app/nsBrowserApp.cpp:267:18

The priority flag is not set for this bug.
:mats, could you have a look please?

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@dholbert Is this something we can add to the upcoming Grid/Subgrid work to solve in parallel?