Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff

[whathty]

### when i use one RealtimeMeshComponent generated the number of meshes >129 ,the ue5 will be crashed,the
detail Crash repoter log like this,Is there some way to change this problem? Think you.

UnrealEditor_RealtimeMeshComponent!TMulticastDelegateBase<FDefaultDelegateUserPolicy>::CompactInvocationList() [D:\UE_5.0\Engine\Source\Runtime\Core\Public\Delegates\MulticastDelegateBase.h:191]
UnrealEditor_RealtimeMeshComponent!TMulticastDelegateBase<FDefaultDelegateUserPolicy>::AddDelegateInstance() [D:\UE_5.0\Engine\Source\Runtime\Core\Public\Delegates\MulticastDelegateBase.h:154]
UnrealEditor_RealtimeMeshComponent!RealtimeMesh::FRealtimeMeshLODData::CreateSectionGroup() [D:\UE5\loadObj\Plugins\RealtimeMeshComponent\Source\RealtimeMeshComponent\Private\Data\RealtimeMeshLOD.cpp:78]
UnrealEditor_RealtimeMeshComponent!URealtimeMeshSimple::CreateSectionGroupWithMesh() [D:\UE5\loadObj\Plugins\RealtimeMeshComponent\Source\RealtimeMeshComponent\Private\RealtimeMeshSimple.cpp:746]
UnrealEditor_RealtimeMeshComponent!URealtimeMeshSimple::execCreateSectionGroupWithMesh() [D:\UE5\loadObj\Plugins\RealtimeMeshComponent\Intermediate\Build\Win64\UnrealEditor\Inc\RealtimeMeshComponent\RealtimeMeshSimple.gen.cpp:403]
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::execLet() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:2656]
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!AActor::BeginPlay() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Actor.cpp:3909]
UnrealEditor_Engine!AActor::DispatchBeginPlay() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Actor.cpp:3849]
UnrealEditor_Engine!AWorldSettings::NotifyBeginPlay() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\WorldSettings.cpp:283]
UnrealEditor_Engine!AGameMode::HandleMatchHasStarted() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\GameMode.cpp:222]
UnrealEditor_Engine!AGameMode::SetMatchState() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\GameMode.cpp:339]
UnrealEditor_Engine!AGameMode::StartMatch() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\GameMode.cpp:199]
UnrealEditor_Engine!UWorld::BeginPlay() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\World.cpp:4908]
UnrealEditor_Engine!UGameInstance::StartPlayInEditorGameInstance() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\GameInstance.cpp:500]
UnrealEditor_UnrealEd!UEditorEngine::CreateInnerProcessPIEGameInstance() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:3052]
UnrealEditor_UnrealEd!UEditorEngine::OnLoginPIEComplete_Deferred() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:1568]
UnrealEditor_UnrealEd!UEditorEngine::CreateNewPlayInEditorInstance() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:1830]
UnrealEditor_UnrealEd!UEditorEngine::StartPlayInEditorSession() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:2798]
UnrealEditor_UnrealEd!UEditorEngine::StartQueuedPlaySessionRequestImpl() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:1148]
UnrealEditor_UnrealEd!UEditorEngine::StartQueuedPlaySessionRequest() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:1051]
UnrealEditor_UnrealEd!UEditorEngine::Tick() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:1665]
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

[whathty]

I Only use RealtimeMeshSimple blueprint

[Connor Jakubik]

Probably due to RMC's use of int8 as the section index, as per @Moddingear on the discord.

probably because it uses a char for section index, the max value is 127
there's nothing preventing you from changing that to an int, and the performance difference would be null

Notably, that's only possible with compiling the plugin from C++. Another fix would be making more components to use more mesh sections on.

[Moddingear]

You're creating 128+ section groups, you could try adding more sections to each section group. Each section group cant have INT16_MAX sections in it.
Regarding that bug, it's because it's trying to access a negative index due to it being int8 and wrapping around. To be fair, noone uses that many sections.

[whathty]

@Moddingear @connorjak,Thanks a lot,It seem to work. Is there some settings to Pack this plugin? when I Packing the plugin to released game,the game can work well,But when the game exit,it will report bug Like this,I only use the example blueprints of plugins in game.

LowLevelFatalError [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp] [Line: 1323] 
Failed to find function OnCancel in None None.None

0x00007ff6ebb4df52 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb09d6e3 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb063b8a loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb8a68f4 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb8b0a1f loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6ed1535ad loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb89a8b7 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb89ad04 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb030a76 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb89a5f6 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb9c63fb loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb9c67be loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb037042 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb037606 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb03765a loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb0388f4 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6eb041314 loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ff6ee886c2e loadObj-Win64-Shipping.exe!UnknownFunction []
0x00007ffedecf7614 KERNEL32.DLL!UnknownFunction []
0x00007ffee0b226a1 ntdll.dll!UnknownFunction []

[Moddingear]

Last comment is unrelated to this issue, open another issue.
Marking this as resolved.