https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux-chromeos-dbg/215

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8942261554242263072%2F%2B%2Fsteps%2Fmash_browser_tests__with_patch_%2F0%2Flogs%2FWebUIWebViewBrowserTest.AddContentScriptToOneWebViewShouldNotInjectToTheOtherWebView%2F0

[17246:17290:0630/143441.777595:FATAL:window_manager_state.cc(515)] Check failed: tree.
#0 0x7f03b8da00dd base::debug::StackTrace::StackTrace()
#1 0x7f03b8ae40ec base::debug::StackTrace::StackTrace()
#2 0x7f03b8b4daed logging::LogMessage::~LogMessage()
#3 0x7f03a52cb7af ui::ws::WindowManagerState::GetEventTargetClientId()
#4 0x7f03a527b4e3 ui::ws::EventProcessor::GetWindowForMouseCursor()
#5 0x7f03a527b421 ui::ws::EventProcessor::GetCurrentMouseCursor()
#6 0x7f03a52cb4dc ui::ws::WindowManagerState::UpdateNativeCursorFromEventProcessor()
#7 0x7f03a5282025 ui::ws::EventProcessor::UpdateCursorProvider()
#8 0x7f03a527d07c ui::ws::EventProcessor::UpdateCursorProviderByLastKnownLocationOnFoundWindow()
#9 0x7f03a39b95cd _ZN4base8internal13FunctorTraitsIMN3ash21HighlighterResultViewEFvRKNS_9TimeDeltaERKNS_17RepeatingCallbackIFvvEEEEvE6InvokeISD_PS3_JS6_SB_EEEvT_OT0_DpOT1_
#10 0x7f03a39b94fa _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKMN3ash21HighlighterResultViewEFvRKNS_9TimeDeltaERKNS_17RepeatingCallbackIFvvEEEEJPS5_S8_SD_EEEvOT_DpOT0_
#11 0x7f03a5283595 _ZN4base8internal7InvokerINS0_9BindStateIMN2ui2ws14EventProcessorEFvRKNS4_13EventLocationERKNS4_13DeepestWindowEEJNS0_17UnretainedWrapperIS5_EEEEEFvS8_SB_EE7RunImplISD_NSt3__15tupleIJSF_EEEJLm0EEEEvOT_OT0_NSK_16integer_sequenceImJXspT1_EEEES8_SB_
#12 0x7f03a52834c9 _ZN4base8internal7InvokerINS0_9BindStateIMN2ui2ws14EventProcessorEFvRKNS4_13EventLocationERKNS4_13DeepestWindowEEJNS0_17UnretainedWrapperIS5_EEEEEFvS8_SB_EE7RunOnceEPNS0_13BindStateBaseES8_SB_
#13 0x7f03a4452a1e _ZNO4base12OnceCallbackIFvRKNSt3__112basic_stringItNS_18string16_internals20string16_char_traitsENS1_9allocatorItEEEERKNS2_IcNS1_11char_traitsIcEENS5_IcEEEEEE3RunES9_SF_
#14 0x7f03a528809a ui::ws::EventTargeter::FindTargetForLocationNow()
#15 0x7f03a5287fd5 ui::ws::EventTargeter::FindTargetForLocation()
#16 0x7f03a527c745 ui::ws::EventProcessor::UpdateCursorProviderByLastKnownLocation()
#17 0x7f03a52dbdee ui::ws::WindowServer::UpdateNativeCursorFromMouseLocation()
#18 0x7f03a52dcadd ui::ws::WindowServer::OnWindowHierarchyChanged()
#19 0x7f03a529eb05 ui::ws::ServerWindow::Remove()
#20 0x7f03a529da1c ui::ws::ServerWindow::~ServerWindow()
#21 0x7f03a529eb49 ui::ws::ServerWindow::~ServerWindow()
#22 0x7f03a52e64d5 ui::ws::WindowTree::DestroyWindows()
#23 0x7f03a52e5689 ui::ws::WindowTree::~WindowTree()
#24 0x7f03a52e66a9 ui::ws::WindowTree::~WindowTree()
#25 0x7f03a52d282d ui::ws::WindowServer::DestroyTree()
#26 0x7f03a3b4e580 _ZN4base8internal13FunctorTraitsIMN3ash9ShelfViewEFvPN5views4ViewEEvE6InvokeIS8_PS3_JS6_EEEvT_OT0_DpOT1_
#27 0x7f03a3b4e4af _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIMN3ash9ShelfViewEFvPN5views4ViewEEJPS5_S8_EEEvOT_DpOT0_
#28 0x7f03a531ab52 _ZN4base8internal7InvokerINS0_9BindStateIMN2ui2ws12WindowServerEFvPNS4_10WindowTreeEEJNS0_17UnretainedWrapperIS5_EENSA_IS6_EEEEEFvvEE7RunImplIRKS9_RKNSt3__15tupleIJSB_SC_EEEJLm0ELm1EEEEvOT_OT0_NSJ_16integer_sequenceImJXspT1_EEEE
#29 0x7f03a531aa5c _ZN4base8internal7InvokerINS0_9BindStateIMN2ui2ws12WindowServerEFvPNS4_10WindowTreeEEJNS0_17UnretainedWrapperIS5_EENSA_IS6_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
#30 0x7f03b39bbdce _ZNO4base12OnceCallbackIFvvEE3RunEv
#31 0x7f03b39cca99 mojo::InterfaceEndpointClient::NotifyError()
#32 0x7f03b39d92cd mojo::internal::MultiplexRouter::ProcessNotifyErrorTask()
#33 0x7f03b39d6a90 mojo::internal::MultiplexRouter::ProcessTasks()
#34 0x7f03b39d52ef mojo::internal::MultiplexRouter::OnPipeConnectionError()
#35 0x7f03b39c633d _ZN4base8internal13FunctorTraitsIMN4mojo8internal19ControlMessageProxyEFvvEvE6InvokeIS6_PS4_JEEEvT_OT0_DpOT1_
#36 0x7f03b39c6284 _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKMN4mojo8internal19ControlMessageProxyEFvvEJPS6_EEEvOT_DpOT0_
#37 0x7f03b39de0b5 _ZN4base8internal7InvokerINS0_9BindStateIMN4mojo8internal15MultiplexRouterEFvvEJNS0_17UnretainedWrapperIS5_EEEEEFvvEE7RunImplIRKS7_RKNSt3__15tupleIJS9_EEEJLm0EEEEvOT_OT0_NSG_16integer_sequenceImJXspT1_EEEE
#38 0x7f03b39ddffc _ZN4base8internal7InvokerINS0_9BindStateIMN4mojo8internal15MultiplexRouterEFvvEJNS0_17UnretainedWrapperIS5_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
#39 0x7f03b39bbdce _ZNO4base12OnceCallbackIFvvEE3RunEv
#40 0x7f03b39b9358 mojo::Connector::HandleError()
#41 0x7f03b39ba877 mojo::Connector::OnHandleReadyInternal()
#42 0x7f03b39ba78b mojo::Connector::OnWatcherHandleReady()
#43 0x7f03b39bdfbf _ZN4base8internal13FunctorTraitsIMN4mojo9ConnectorEFvjEvE6InvokeIS5_PS3_JjEEEvT_OT0_DpOT1_
#44 0x7f03b39bdeef _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKMN4mojo9ConnectorEFvjEJPS5_jEEEvOT_DpOT0_
#45 0x7f03b39bde85 _ZN4base8internal7InvokerINS0_9BindStateIMN4mojo9ConnectorEFvjEJNS0_17UnretainedWrapperIS4_EEEEEFvjEE7RunImplIRKS6_RKNSt3__15tupleIJS8_EEEJLm0EEEEvOT_OT0_NSF_16integer_sequenceImJXspT1_EEEEOj
#46 0x7f03b39bddbb _ZN4base8internal7InvokerINS0_9BindStateIMN4mojo9ConnectorEFvjEJNS0_17UnretainedWrapperIS4_EEEEEFvjEE3RunEPNS0_13BindStateBaseEj
#47 0x7f03b39b53ae _ZNKR4base17RepeatingCallbackIFvjEE3RunEj
#48 0x7f03b39bd13f mojo::SimpleWatcher::DiscardReadyState()
#49 0x7f03b39bd3bf _ZN4base8internal13FunctorTraitsIPFvRKNS_17RepeatingCallbackIFvjEEEjRKN4mojo18HandleSignalsStateEEvE6InvokeIRKSC_JS6_jSA_EEEvOT_DpOT0_
#50 0x7f03b39bd35d _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIRKPFvRKNS_17RepeatingCallbackIFvjEEEjRKN4mojo18HandleSignalsStateEEJS8_jSC_EEEvOT_DpOT0_
#51 0x7f03b39bd300 _ZN4base8internal7InvokerINS0_9BindStateIPFvRKNS_17RepeatingCallbackIFvjEEEjRKN4mojo18HandleSignalsStateEEJS5_EEEFvjSB_EE7RunImplIRKSD_RKNSt3__15tupleIJS5_EEEJLm0EEEEvOT_OT0_NSK_16integer_sequenceImJXspT1_EEEEOjSB_
#52 0x7f03b39bd236 _ZN4base8internal7InvokerINS0_9BindStateIPFvRKNS_17RepeatingCallbackIFvjEEEjRKN4mojo18HandleSignalsStateEEJS5_EEEFvjSB_EE3RunEPNS0_13BindStateBaseEjSB_
#53 0x7f03b908580e _ZNKR4base17RepeatingCallbackIFvjRKN4mojo18HandleSignalsStateEEE3RunEjS4_
#54 0x7f03b908517b mojo::SimpleWatcher::OnHandleReady()
#55 0x7f03b9085fc3 _ZN4base8internal13FunctorTraitsIMN4mojo13SimpleWatcherEFvijRKNS2_18HandleSignalsStateEEvE6InvokeIS8_RKNS_7WeakPtrIS3_EEJRKiRKjS6_EEEvT_OT0_DpOT1_
#56 0x7f03b9085f05 _ZN4base8internal12InvokeHelperILb1EvE8MakeItSoIRKMN4mojo13SimpleWatcherEFvijRKNS4_18HandleSignalsStateEERKNS_7WeakPtrIS5_EEJRKiRKjS8_EEEvOT_OT0_DpOT1_
#57 0x7f03b9085e62 _ZN4base8internal7InvokerINS0_9BindStateIMN4mojo13SimpleWatcherEFvijRKNS3_18HandleSignalsStateEEJNS_7WeakPtrIS4_EEijS5_EEEFvvEE7RunImplIRKS9_RKNSt3__15tupleIJSB_ijS5_EEEJLm0ELm1ELm2ELm3EEEEvOT_OT0_NSI_16integer_sequenceImJXspT1_EEEE
#58 0x7f03b9085cdc _ZN4base8internal7InvokerINS0_9BindStateIMN4mojo13SimpleWatcherEFvijRKNS3_18HandleSignalsStateEEJNS_7WeakPtrIS4_EEijS5_EEEFvvEE3RunEPNS0_13BindStateBaseE
#59 0x7f03b8a9583e _ZNO4base12OnceCallbackIFvvEE3RunEv
#60 0x7f03b8ae54da base::debug::TaskAnnotator::RunTask()
#61 0x7f03b8b6ef7a base::internal::IncomingTaskQueue::RunTask()