Unreal Engine Issues and Bug Tracker (UE-34384)

Description

Crash occurs when the user creates a loop between two anim blueprints referencing each other as sub anim instances

Steps to Reproduce

Open QAGame in editor.
Create a new anim bp based on UE4_Mannequin_Skeleton. Name it BP_A.
Create another anim bp based on UE4_Mannequin_Skeleton. Name it BP_B.
Open BP_A.
Add a Sub Anim Instance node and wire it to the Final Animation Pose.
Set the Sub Anim Instance to BP_B and compile.
Open BP_B.
Add a Sub Anim Instance node and wire it to the final Animation Pose.
Set the Sub Anim Instance to BP_A and compile.

RESULT:

Crash.

Callstack

UE4Editor_Core!FSampleFNameChurn::NameCreationHook() unrealnames.cpp:1394
UE4Editor_Core!FName::InitInternal_FindOrAddNameEntry<char>() unrealnames.cpp:772
UE4Editor_Core!FName::InitInternal_FindOrAdd<char>() unrealnames.cpp:737
UE4Editor_Core!FName::InitInternal<char>() unrealnames.cpp:627
UE4Editor_Core!FName::InitInternal_HashSplit<char>() unrealnames.cpp:583
UE4Editor_Core!FName::Init() unrealnames.cpp:536
UE4Editor_Core!FName::FName() unrealnames.cpp:417
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:680
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691
UE4Editor_KismetCompiler!FAnimBlueprintCompiler::GetDuplicatedSlotAndStateNames() animblueprintcompiler.cpp:691

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Fixed

Component	OLD - Anim
Affects Versions	4.13
Target Fix	4.13

Fix Commit	3082221
Main Commit	3092051
Release Commit	3082221

Created	Aug 8, 2016
Resolved	Aug 9, 2016
Updated	May 18, 2020

View Jira Issue

UE-34384

Crash creating loop between two anim blueprints referencing each other as sub anim instances

Crash creating loop between two anim blueprints referencing each other as sub anim instances

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