Found while fuzzing m-c 20211028-617a98c2fc8f (--enable-debug --enable-fuzzing)

Testcase can be reproduced using the following commands:

$ pip install fuzzfetch grizzly-framework
$ python -m fuzzfetch --build 50e4a4e6975a --asan --fuzzing -n firefox
$ python -m grizzly.replay ./firefox/firefox testcase.html

Assertion failure: geometry->mBounds.IsEqualEdges(aData->mGeometry->mBounds), at /builds/worker/checkouts/gecko/gfx/layers/wr/WebRenderCommandBuilder.cpp:466

#0 0x7fd8351d897b in mozilla::layers::DIGroup::ComputeGeometryChange(mozilla::nsDisplayItem*, mozilla::layers::BlobItemData*, mozilla::gfx::BaseMatrix<float>&, mozilla::nsDisplayListBuilder*) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:465:13
#1 0x7fd8351d69cd in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1282:30
#2 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#3 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#4 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#5 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#6 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#7 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#8 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#9 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#10 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#11 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#12 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#13 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#14 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#15 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#16 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#17 0x7fd8351d6d29 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1333:22
#18 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#19 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#20 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#21 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#22 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#23 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#24 0x7fd8351d7270 in mozilla::layers::Grouper::ConstructGroupInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1262:20
#25 0x7fd8351d6d77 in mozilla::layers::Grouper::ConstructItemInsideInactive(mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayItem*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1340:20
#26 0x7fd8351d1f6d in mozilla::layers::Grouper::ConstructGroups(mozilla::nsDisplayListBuilder*, mozilla::layers::WebRenderCommandBuilder*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::DIGroup*, mozilla::nsDisplayList*, mozilla::layers::StackingContextHelper const&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1244:7
#27 0x7fd8351d9e47 in mozilla::layers::WebRenderCommandBuilder::DoGroupingForDisplayList(mozilla::nsDisplayList*, mozilla::nsDisplayItem*, mozilla::nsDisplayListBuilder*, mozilla::layers::StackingContextHelper const&, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1518:5
#28 0x7fd8351dcc9c in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommandsFromDisplayList(mozilla::nsDisplayList*, mozilla::nsDisplayItem*, mozilla::nsDisplayListBuilder*, mozilla::layers::StackingContextHelper const&, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, bool) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1688:5
#29 0x7fd83b07baf0 in mozilla::nsDisplayWrapList::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:4614:30
#30 0x7fd83b0a1398 in mozilla::nsDisplaySVGWrapper::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:8426:29
#31 0x7fd8351df91c in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommands(mozilla::nsDisplayItem*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::nsDisplayListBuilder*) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1669:41
#32 0x7fd8351dd909 in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommandsFromDisplayList(mozilla::nsDisplayList*, mozilla::nsDisplayItem*, mozilla::nsDisplayListBuilder*, mozilla::layers::StackingContextHelper const&, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, bool) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1829:7
#33 0x7fd83b08e3b2 in mozilla::nsDisplayTransform::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:6676:30
#34 0x7fd8351df91c in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommands(mozilla::nsDisplayItem*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::nsDisplayListBuilder*) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1669:41
#35 0x7fd8351dd909 in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommandsFromDisplayList(mozilla::nsDisplayList*, mozilla::nsDisplayItem*, mozilla::nsDisplayListBuilder*, mozilla::layers::StackingContextHelper const&, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, bool) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1829:7
#36 0x7fd83b07baf0 in mozilla::nsDisplayWrapList::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:4614:30
#37 0x7fd83b09d871 in mozilla::nsDisplayMasksAndClipPaths::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:8141:25
#38 0x7fd8351df91c in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommands(mozilla::nsDisplayItem*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::nsDisplayListBuilder*) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1669:41
#39 0x7fd8351dd909 in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommandsFromDisplayList(mozilla::nsDisplayList*, mozilla::nsDisplayItem*, mozilla::nsDisplayListBuilder*, mozilla::layers::StackingContextHelper const&, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, bool) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1829:7
#40 0x7fd83b07baf0 in mozilla::nsDisplayWrapList::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:4614:30
#41 0x7fd83b09d871 in mozilla::nsDisplayMasksAndClipPaths::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:8141:25
#42 0x7fd8351df91c in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommands(mozilla::nsDisplayItem*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::nsDisplayListBuilder*) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1669:41
#43 0x7fd8351dd909 in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommandsFromDisplayList(mozilla::nsDisplayList*, mozilla::nsDisplayItem*, mozilla::nsDisplayListBuilder*, mozilla::layers::StackingContextHelper const&, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, bool) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1829:7
#44 0x7fd83b07baf0 in mozilla::nsDisplayWrapList::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:4614:30
#45 0x7fd83b09d871 in mozilla::nsDisplayMasksAndClipPaths::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:8141:25
#46 0x7fd8351df91c in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommands(mozilla::nsDisplayItem*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::nsDisplayListBuilder*) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1669:41
#47 0x7fd8351dd909 in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommandsFromDisplayList(mozilla::nsDisplayList*, mozilla::nsDisplayItem*, mozilla::nsDisplayListBuilder*, mozilla::layers::StackingContextHelper const&, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, bool) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1829:7
#48 0x7fd83b07baf0 in mozilla::nsDisplayWrapList::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:4614:30
#49 0x7fd83b0815bb in mozilla::nsDisplayOwnLayer::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::layers::RenderRootStateManager*, mozilla::nsDisplayListBuilder*) src/layout/painting/nsDisplayList.cpp:5242:22
#50 0x7fd8351df91c in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommands(mozilla::nsDisplayItem*, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::layers::StackingContextHelper const&, mozilla::nsDisplayListBuilder*) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1669:41
#51 0x7fd8351dd909 in mozilla::layers::WebRenderCommandBuilder::CreateWebRenderCommandsFromDisplayList(mozilla::nsDisplayList*, mozilla::nsDisplayItem*, mozilla::nsDisplayListBuilder*, mozilla::layers::StackingContextHelper const&, mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, bool) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1829:7
#52 0x7fd8351dbfdd in mozilla::layers::WebRenderCommandBuilder::BuildWebRenderCommands(mozilla::wr::DisplayListBuilder&, mozilla::wr::IpcResourceUpdateQueue&, mozilla::nsDisplayList*, mozilla::nsDisplayListBuilder*, mozilla::layers::WebRenderScrollData&, WrFiltersHolder&&) src/gfx/layers/wr/WebRenderCommandBuilder.cpp:1590:5
#53 0x7fd8351fa806 in mozilla::layers::WebRenderLayerManager::EndTransactionWithoutLayer(mozilla::nsDisplayList*, mozilla::nsDisplayListBuilder*, WrFiltersHolder&&, mozilla::layers::WebRenderBackgroundData*, double) src/gfx/layers/wr/WebRenderLayerManager.cpp:362:30
#54 0x7fd83b05d7f6 in mozilla::nsDisplayList::PaintRoot(mozilla::nsDisplayListBuilder*, gfxContext*, unsigned int, mozilla::Maybe<double>) src/layout/painting/nsDisplayList.cpp:2195:18
#55 0x7fd83a98a4e8 in nsLayoutUtils::PaintFrame(gfxContext*, nsIFrame*, nsRegion const&, unsigned int, mozilla::nsDisplayListBuilderMode, nsLayoutUtils::PaintFrameFlags) src/layout/base/nsLayoutUtils.cpp:3456:9
#56 0x7fd83a8aae36 in mozilla::PresShell::PaintInternal(nsView*, mozilla::PaintInternalFlags) src/layout/base/PresShell.cpp:6405:5
#57 0x7fd83a21c74d in nsViewManager::ProcessPendingUpdatesPaint(nsIWidget*) src/view/nsViewManager.cpp:440:18
#58 0x7fd83a21becf in nsViewManager::ProcessPendingUpdatesForView(nsView*, bool) src/view/nsViewManager.cpp:375:22
#59 0x7fd83a21de8b in nsViewManager::ProcessPendingUpdates() src/view/nsViewManager.cpp:948:5
#60 0x7fd83a823fe4 in nsRefreshDriver::Tick(mozilla::layers::BaseTransactionId<mozilla::VsyncIdType>, mozilla::TimeStamp, nsRefreshDriver::IsExtraTick) src/layout/base/nsRefreshDriver.cpp:2545:11
#61 0x7fd83a8432d5 in operator() src/layout/base/nsRefreshDriver.cpp:1603:25
#62 0x7fd83a8432d5 in mozilla::detail::RunnableFunction<nsRefreshDriver::EnsureTimerStarted(nsRefreshDriver::EnsureTimerStartedFlags)::$_1>::Run() /builds/worker/workspace/obj-build/dist/include/nsThreadUtils.h:531:5
#63 0x7fd83241fb32 in mozilla::RunnableTask::Run() src/xpcom/threads/TaskController.cpp:468:16
#64 0x7fd8323e590d in mozilla::TaskController::DoExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) src/xpcom/threads/TaskController.cpp:771:26
#65 0x7fd8323e2e68 in mozilla::TaskController::ExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) src/xpcom/threads/TaskController.cpp:607:15
#66 0x7fd8323e3579 in mozilla::TaskController::ProcessPendingMTTask(bool) src/xpcom/threads/TaskController.cpp:391:36
#67 0x7fd832429101 in operator() src/xpcom/threads/TaskController.cpp:124:37
#68 0x7fd832429101 in mozilla::detail::RunnableFunction<mozilla::TaskController::InitializeInternal()::$_0>::Run() src/xpcom/threads/nsThreadUtils.h:531:5
#69 0x7fd832405957 in nsThread::ProcessNextEvent(bool, bool*) src/xpcom/threads/nsThread.cpp:1175:16
#70 0x7fd83241097c in NS_ProcessNextEvent(nsIThread*, bool) src/xpcom/threads/nsThreadUtils.cpp:467:10
#71 0x7fd8338ee78f in mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) src/ipc/glue/MessagePump.cpp:85:21
#72 0x7fd83376c901 in RunInternal src/ipc/chromium/src/base/message_loop.cc:331:10
#73 0x7fd83376c901 in RunHandler src/ipc/chromium/src/base/message_loop.cc:324:3
#74 0x7fd83376c901 in MessageLoop::Run() src/ipc/chromium/src/base/message_loop.cc:306:3
#75 0x7fd83a2e2137 in nsBaseAppShell::Run() src/widget/nsBaseAppShell.cpp:137:27
#76 0x7fd83ecc35cf in XRE_RunAppShell() src/toolkit/xre/nsEmbedFunctions.cpp:917:20
#77 0x7fd83376c901 in RunInternal src/ipc/chromium/src/base/message_loop.cc:331:10
#78 0x7fd83376c901 in RunHandler src/ipc/chromium/src/base/message_loop.cc:324:3
#79 0x7fd83376c901 in MessageLoop::Run() src/ipc/chromium/src/base/message_loop.cc:306:3
#80 0x7fd83ecc2802 in XRE_InitChildProcess(int, char**, XREChildData const*) src/toolkit/xre/nsEmbedFunctions.cpp:749:34
#81 0x560a4310c6ed in content_process_main(mozilla::Bootstrap*, int, char**) src/browser/app/../../ipc/contentproc/plugin-container.cpp:57:28
#82 0x560a4310cb18 in main src/browser/app/nsBrowserApp.cpp:327:18
#83 0x7fd857a89bf6 in __libc_start_main /build/glibc-S9d2JN/glibc-2.27/csu/../csu/libc-start.c:310
#84 0x560a4305b7b9 in _start (/home/twsmith/workspace/browsers/m-c-20211104154126-fuzzing-asan-opt/firefox+0x5c7b9)

Bugmon Analysis
Verified bug as reproducible on mozilla-central 20211104214758-1f57920fc040.
Failed to bisect testcase (Testcase reproduces on start build!):

Start: 81a3ef82469bf0bfd2e85086f3dfa3f91724f323 (20201106041434)
End: 617a98c2fc8fb577df2c6c04e3c08f78dfc65c07 (20211028033711)
BuildFlags: BuildFlags(asan=False, tsan=False, debug=True, fuzzing=True, coverage=False, valgrind=False, no_opt=False, fuzzilli=False)

A Pernosco session is available here: https://pernos.co/debug/q4MsreLRHWhc2M1n3aDWQg/index.html

Is the testcase reduced? It seems pretty complicated.

Yeah that's the best I could do, down from 500KB :)

Bugmon Analysis
Testcase crashes using the initial build (mozilla-central 20211028033711-617a98c2fc8f) but not with tip (mozilla-central 20220520153703-1d31a0098979.)
The bug appears to have been fixed in the following build range:

Start: ddbf2ba9acc3bdfe51595b2ee9943c30b25d1338 (20220516133202)
End: 6cc1af98195e7b1f353f5116a2c66dd7921d9af6 (20220515224447)
Pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=ddbf2ba9acc3bdfe51595b2ee9943c30b25d1338&tochange=6cc1af98195e7b1f353f5116a2c66dd7921d9af6
Removing bugmon keyword as no further action possible. Please review the bug and re-add the keyword for further analysis.