Unreal Engine Issues

UE-148539

Sequencer based Camera Shake throws an assertion when spammed

Sequencer based Camera Shake throws an assertion when spammed

Description

Activating a Sequencer based Camera Shake repetitively results in an assertion being thrown.

Assertion failed: DestAllocationIndex != SourceAllocationIndex [File:D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntityManager.cpp] [Line: 1970]
Steps to Reproduce
  1. Create a Third Person project
  2. Create a new Blueprint derived from CameraShakeBase that uses Sequencer Camera Shake
    1. Right Click in the content browser then select Blueprint Class
    2. Expand All Classes then search for and select CameraShakeBase
    3. Name it 'BP_CamShake'
    4. In the Detail panel set the 'Root Shake Pattern' to 'Sequence Camera Shake Pattern'
    5. Set the Play Rate to 1.0
    6. Select the Sequence drop down then select 'Camera Animation Sequence' under Create New Asset, pick a name, and save.
    7. Compile, save, and close BP_CamShake
  3. Open the Sequencer asset we just created
  4. Expand the Transform and Rotation key the Roll at 30.0
  5. Scrub forward then key the Roll at 0 and save the sequence
  6. Open BP_ThirdPersonCharacter
  7. In the Event Graph assign a key press of P to trigger Start Camera shake using BP_CamShake targeting the Player Camera Manager
    1. In the Event Graph right click then search Keyboard P and create a 'P' node
    2. Off the 'P' node create a 'Start Camera Shake' node
    3. Assign 'Get Player Camera Manager' to Target
    4. Set Shake Class to 'BP_CamShake'
    5. Compile, save, and close the Blueprint
  8. Play in Editor
  9. Press 'P' repetitively ~40 times

Expected Results:
Camera continues to shake without resetting

Actual Results:
Editor Crashes with an assertion

Callstack
Assertion failed: DestAllocationIndex != SourceAllocationIndex [File:D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntityManager.cpp] [Line: 1970]

UnrealEditor_MovieScene!UE::MovieScene::FEntityManager::MigrateEntity() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntityManager.cpp:1970]
UnrealEditor_MovieScene!UE::MovieScene::FEntityManager::AddComponents() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntityManager.cpp:1164]
UnrealEditor_MovieScene!UE::MovieScene::FEntityLedger::UnlinkEverything() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneEntityLedger.cpp:188]
UnrealEditor_MovieScene!UE::MovieScene::FSequenceInstance::DestroyImmediately() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneSequenceInstance.cpp:289]
UnrealEditor_MovieScene!UE::MovieScene::FInstanceRegistry::DestroyInstance() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\EntitySystem\MovieSceneInstanceRegistry.cpp:106]
UnrealEditor_MovieScene!FMovieSceneRootEvaluationTemplateInstance::Initialize() [D:\build\++UE5\Sync\Engine\Source\Runtime\MovieScene\Private\Evaluation\MovieSceneEvaluationTemplateInstance.cpp:124]
UnrealEditor_TemplateSequence!USequenceCameraShakePattern::StartShakePatternImpl() [D:\build\++UE5\Sync\Engine\Plugins\MovieScene\TemplateSequence\Source\TemplateSequence\Private\SequenceCameraShake.cpp:83]
UnrealEditor_Engine!UCameraShakeBase::StartShake() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Camera\CameraShakeBase.cpp:222]
UnrealEditor_Engine!UCameraModifier_CameraShake::AddCameraShake() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Camera\CameraModifier_CameraShake.cpp:166]
UnrealEditor_Engine!APlayerCameraManager::StartCameraShake() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\PlayerCameraManager.cpp:1400]
UnrealEditor_Engine!APlayerCameraManager::execStartCameraShake() [D:\build\++UE5\Sync\Engine\Intermediate\Build\Win64\UnrealEditor\Inc\Engine\PlayerCameraManager.gen.cpp:612]
UnrealEditor_CoreUObject!UFunction::Invoke() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:5912]
UnrealEditor_CoreUObject!UObject::CallFunction() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1012]
UnrealEditor_CoreUObject!UObject::ProcessContextOpcode() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:2871]
UnrealEditor_CoreUObject!UObject::execLetObj() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:2692]
UnrealEditor_CoreUObject!ProcessLocalScriptFunction() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1082]
UnrealEditor_CoreUObject!ProcessScriptFunction<void (__cdecl*)(UObject *,FFrame &,void *)>() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:912]
UnrealEditor_CoreUObject!ProcessLocalFunction() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1143]
UnrealEditor_CoreUObject!ProcessLocalScriptFunction() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1082]
UnrealEditor_CoreUObject!UObject::ProcessInternal() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1170]
UnrealEditor_CoreUObject!UFunction::Invoke() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:5912]
UnrealEditor_CoreUObject!UObject::ProcessEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:2003]
UnrealEditor_Engine!AActor::ProcessEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Actor.cpp:1030]
UnrealEditor_Engine!FInputActionUnifiedDelegate::Execute() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Classes\Components\InputComponent.h:302]
UnrealEditor_Engine!UPlayerInput::ProcessInputStack() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\UserInterface\PlayerInput.cpp:1419]
UnrealEditor_Engine!APlayerController::ProcessPlayerInput() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\PlayerController.cpp:2609]
UnrealEditor_Engine!APlayerController::TickPlayerInput() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\PlayerController.cpp:4762]
UnrealEditor_Engine!APlayerController::PlayerTick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\PlayerController.cpp:2234]
UnrealEditor_Engine!APlayerController::TickActor() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\PlayerController.cpp:4914]
UnrealEditor_Engine!FActorTickFunction::ExecuteTick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Actor.cpp:197]
UnrealEditor_Engine!FTickFunctionTask::DoTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\TickTaskManager.cpp:284]
UnrealEditor_Engine!TGraphTask<FTickFunctionTask>::ExecuteTask() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Public\Async\TaskGraphInterfaces.h:975]
UnrealEditor_Core!FNamedTaskThread::ProcessTasksNamedThread() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:753]
UnrealEditor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:642]
UnrealEditor_Core!FTaskGraphCompatibilityImplementation::WaitUntilTasksComplete() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:2169]
UnrealEditor_Engine!FTickTaskSequencer::ReleaseTickGroup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\TickTaskManager.cpp:565]
UnrealEditor_Engine!FTickTaskManager::RunTickGroup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\TickTaskManager.cpp:1592]
UnrealEditor_Engine!UWorld::RunTickGroup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelTick.cpp:790]
UnrealEditor_Engine!UWorld::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\LevelTick.cpp:1531]
UnrealEditor_UnrealEd!UEditorEngine::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:1777]
UnrealEditor_UnrealEd!UUnrealEdEngine::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:474]
UnrealEditor!FEngineLoop::Tick() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5215]
UnrealEditor!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:183]
UnrealEditor!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:147]
UnrealEditor!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:283]
UnrealEditor!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:330]
UnrealEditor!__scrt_common_main_seh() [d:\a01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll
Community References

Sequencer based Camera Shake throws an assertion when spammed

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Fixed
ComponentUE - Anim - Sequencer
Affects Versions5.0
Target Fix5.1
Fix Commit20662639
CreatedApr 7, 2022
ResolvedJun 17, 2022
UpdatedJun 20, 2022