Unreal Engine Issues

UE-173785

Integrity of AnimSyncMarkers compromised while playing AnimMontage with root motion in server side

Integrity of AnimSyncMarkers compromised while playing AnimMontage with root motion in server side

UDN
Description

Reference UDN as it explains well the cause of the issue.

Steps to Reproduce

1. Launch QAGame project
2. Open the MotionWarpingTestLevel.umap
3. Open the "Content/Characters/UE5_Guy/CharacterBP"
4. Open up the Event Graph and update the logic for the vaulting action to support replication/networking. [Example reference image]
5. Start PIE with 2 players and net mode as "Play as Listen Server"
6. Keep performing the vaulting action (jumping over an object) until the marker check fail happens, it might take a couple tries due to the issue being updating animation multiple times in server side.

[Example reference image]
[Image Removed]

Reproduced the issue 3 times (One time per PIE session, multiple vault attempts)

Callstack
UAnimMontage::TickAssetPlayer(FAnimTickRecord &,FAnimNotifyQueue &,FAnimAssetTickContext &) AnimMontage.cpp:1225
UE::Anim::FAnimSync::TickAssetPlayerInstances(FAnimInstanceProxy &,float) AnimSync.cpp:146
FAnimInstanceProxy::UpdateAnimation() AnimInstanceProxy.cpp:1149
USkeletalMeshComponent::PerformAnimationProcessing(const USkeletalMesh *,UAnimInstance *,bool,TArray<UE::Math::TTransform<double>,TSizedDefaultAllocator<32> > &,TArray<UE::Math::TTransform<double>,TSizedDefaultAllocator<32> > &,UE::Math::TVector<double> &,FBlendedHeapCurve &,UE::Anim::FMeshAttributeContainer &) SkeletalMeshComponent.cpp:2046
USkeletalMeshComponent::ParallelAnimationEvaluation() SkeletalMeshComponent.cpp:4008
FParallelAnimationEvaluationTask::DoTask(Type,const TRefCountPtr<FGraphEvent> &) SkeletalMeshComponent.cpp:144
TGraphTask<FParallelAnimationEvaluationTask>::ExecuteTask(TArray<FBaseGraphTask *,TSizedDefaultAllocator<32> > &,Type,bool) TaskGraphInterfaces.h:1310
[Inlined] FBaseGraphTask::Execute(TArray<FBaseGraphTask *,TSizedDefaultAllocator<32> > &,Type,bool) TaskGraphInterfaces.h:919
[Inlined] FTaskGraphCompatibilityImplementation::QueueTask::__l5::<lambda_1>::operator()() TaskGraph.cpp:1971
`LowLevelTasks::FTask::Init<`FTaskGraphCompatibilityImplementation::QueueTask'::`5'::<lambda_1> >'::`11'::<lambda_2>::operator()(const bool) Task.h:504
[Inlined] Invoke(LowLevelTasks::FTask::<lambda_2> &,bool &) Invoke.h:47
[Inlined] LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __cdecl(bool),48>::TTaskDelegateImpl<`LowLevelTasks::FTask::Init<`FTaskGraphCompatibilityImplementation::QueueTask'::`5'::<lambda_1> >'::`11'::<lambda_2>,0>::Call(void *,bool) TaskDelegate.h:162
LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __cdecl(bool),48>::TTaskDelegateImpl<`LowLevelTasks::FTask::Init<`FTaskGraphCompatibilityImplementation::QueueTask'::`5'::<lambda_1> >'::`11'::<lambda_2>,0>::CallAndMove(LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __cdecl(bool),48> &,void *,unsigned int,bool) TaskDelegate.h:171
[Inlined] LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __cdecl(bool),48>::CallAndMove(LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __cdecl(bool),48> &,bool) TaskDelegate.h:308
LowLevelTasks::FTask::ExecuteTask() Task.h:656
LowLevelTasks::FScheduler::ExecuteTask(LowLevelTasks::FTask *&) Scheduler.cpp:162
LowLevelTasks::FScheduler::TryExecuteTaskFrom<&LowLevelTasks::TLocalQueueRegistry<1024>::TLocalQueue::DequeueGlobal,0>(LowLevelTasks::TLocalQueueRegistry<1024>::TLocalQueue *,LowLevelTasks::TLocalQueueRegistry<1024>::FOutOfWork &,bool,bool) Scheduler.cpp:360
LowLevelTasks::FScheduler::WorkerMain(LowLevelTasks::FSleepEvent *,LowLevelTasks::TLocalQueueRegistry<1024>::TLocalQueue *,unsigned int,bool) Scheduler.cpp:402
[Inlined] LowLevelTasks::FScheduler::CreateWorker::__l2::<lambda_1>::operator()() Scheduler.cpp:90
[Inlined] Invoke(<lambda_1> &) Invoke.h:47
UE::Core::Private::Function::TFunctionRefCaller<`LowLevelTasks::FScheduler::CreateWorker'::`2'::<lambda_1>,void __cdecl(void)>::Call(void *) Function.h:474
[Inlined] UE::Core::Private::Function::TFunctionRefBase<UE::Core::Private::Function::TFunctionStorage<1>,void __cdecl(void)>::operator()() Function.h:602
FThreadImpl::Run() Thread.cpp:67
FRunnableThreadWin::Run() WindowsRunnableThread.cpp:146
FRunnableThreadWin::GuardedRun() WindowsRunnableThread.cpp:71
<unknown> 0x00007ffe9c1c74b4
<unknown> 0x00007ffe9d3a26a1
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Fixed
ComponentUE - Anim - Gameplay
Affects Versions5.1, 5.2
Target Fix5.4
Fix Commit26886197
Main Commit26886360
Release Commit26892771
CreatedJan 11, 2023
ResolvedJan 31, 2024
UpdatedFeb 9, 2024
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