Why does my dedicated server crashes when loading a map that uses the water plugin?

quoicoubehquebec · July 1, 2024, 3:15pm

Hey all, i am using the engine’s default water plugin, with buoyancy. My level “OceanMap” is an open world map with a large terrain, streaming and most importantly, i added a “Water Body Ocean” from the engine’s water plugin (which added a WaterZone and Landscape_WaterBrushManager for my landscape). It’s set as server default map.

OceanMap works perfectly fine on standalone game.
I start the server via <UnrealEditor.exe> <path>.uproject -log -server

Problem is, when i start the server, it crashes. Here are parts of the log i find relevant (Water mentionned):

Earlier in the startup:

LogWorldPartition: UWorldPartition::Initialize Context : World NetMode = Dedicated Server, IsServer = 1, IsDedicatedServer = 1, IsServerStreamingEnabled = 0, IsServerStreamingOutEnabled = 0, IsUsingMakingVisibleTransaction = 0, IsUsingMakingInvisibleTransaction = 0
LogAssetRegistry: Warning: ScanPathsSynchronous: Package /Script/WaterEditor.WaterBrushManager does not exist, will not scan.
LogWorldPartition: Can't find class descriptor '/Script/WaterEditor.WaterBrushManager' for loading '/Game/ThirdPerson/Maps/OceanMap.OceanMap:PersistentLevel.Landscape_WaterBrushManager_0', using '/Script/Engine.Actor'
LogWorldPartition: Warning: Invalid class for actor guid `9278FBD645977A8F77EA53BC30D51754` ('Landscape_WaterBrushManager_0') from package '/Game/__ExternalActors__/ThirdPerson/Maps/OceanMap/1/HE/DZKL0SW3RKTBV7WQ30BBOO'
LogWorldPartition: Warning: Invalid actor native class: Actor: 'Landscape_WaterBrushManager_0' (guid '9278FBD645977A8F77EA53BC30D51754') from package '/Game/__ExternalActors__/ThirdPerson/Maps/OceanMap/1/HE/DZKL0SW3RKTBV7WQ30BBOO'

And the error:

LogWindows: Error: === Critical error: ===
LogWindows: Error: 
LogWindows: Error: Fatal error!
LogWindows: Error: 
LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000000
LogWindows: Error: 
LogWindows: Error: [Callstack] 0x00007ffd542cc41b UnrealEditor-Water.dll!`FWaterBodyMeshBuilder::BuildWaterInfoMeshes'::`2'::<lambda_1>::operator()() [C:\Unreal\Engine\Plugins\Experimental\Water\Source\Runtime\Private\WaterBodyMeshBuilder.cpp:62]
LogWindows: Error: [Callstack] 0x00007ffd542e180e UnrealEditor-Water.dll!FWaterBodyMeshBuilder::BuildWaterInfoMeshes() [C:\Unreal\Engine\Plugins\Experimental\Water\Source\Runtime\Private\WaterBodyMeshBuilder.cpp:69]
LogWindows: Error: [Callstack] 0x00007ffd54350d06 UnrealEditor-Water.dll!UWaterBodyComponent::UpdateWaterInfoMeshComponents() [C:\Unreal\Engine\Plugins\Experimental\Water\Source\Runtime\Private\WaterBodyComponent.cpp:1962]
LogWindows: Error: [Callstack] 0x00007ffd54350763 UnrealEditor-Water.dll!UWaterBodyComponent::UpdateWaterBodyRenderData() [C:\Unreal\Engine\Plugins\Experimental\Water\Source\Runtime\Private\WaterBodyComponent.cpp:1925]
LogWindows: Error: [Callstack] 0x00007ffd54318fce UnrealEditor-Water.dll!UWaterBodyComponent::OnPostRegisterAllComponents() [C:\Unreal\Engine\Plugins\Experimental\Water\Source\Runtime\Private\WaterBodyComponent.cpp:1516]
LogWindows: Error: [Callstack] 0x00007ffd54318ffe UnrealEditor-Water.dll!UWaterBodyOceanComponent::OnPostRegisterAllComponents() [C:\Unreal\Engine\Plugins\Experimental\Water\Source\Runtime\Private\WaterBodyOceanComponent.cpp:476]
LogWindows: Error: [Callstack] 0x00007ffd54325553 UnrealEditor-Water.dll!AWaterBody::PostRegisterAllComponents() [C:\Unreal\Engine\Plugins\Experimental\Water\Source\Runtime\Private\WaterBodyActor.cpp:679]
LogWindows: Error: [Callstack] 0x00007ffd6f4db343 UnrealEditor-Engine.dll!AActor::IncrementalRegisterComponents() [C:\Unreal\Engine\Source\Runtime\Engine\Private\Actor.cpp:5495]
LogWindows: Error: [Callstack] 0x00007ffd7054ed8d UnrealEditor-Engine.dll!ULevel::IncrementalRegisterComponents() [C:\Unreal\Engine\Source\Runtime\Engine\Private\Level.cpp:1755]
LogWindows: Error: [Callstack] 0x00007ffd7054f4a8 UnrealEditor-Engine.dll!ULevel::IncrementalUpdateComponents() [C:\Unreal\Engine\Source\Runtime\Engine\Private\Level.cpp:1674]
LogWindows: Error: [Callstack] 0x00007ffd7192129d UnrealEditor-Engine.dll!UWorld::UpdateWorldComponents() [C:\Unreal\Engine\Source\Runtime\Engine\Private\World.cpp:2636]
LogWindows: Error: [Callstack] 0x00007ffd718e8167 UnrealEditor-Engine.dll!UWorld::InitializeActorsForPlay() [C:\Unreal\Engine\Source\Runtime\Engine\Private\World.cpp:5160]
LogWindows: Error: [Callstack] 0x00007ffd7174a0bf UnrealEditor-Engine.dll!UEngine::LoadMap() [C:\Unreal\Engine\Source\Runtime\Engine\Private\UnrealEngine.cpp:15492]
LogWindows: Error: [Callstack] 0x00007ffd716d00ea UnrealEditor-Engine.dll!UEngine::Browse() [C:\Unreal\Engine\Source\Runtime\Engine\Private\UnrealEngine.cpp:14670]
LogWindows: Error: [Callstack] 0x00007ffd702b6409 UnrealEditor-Engine.dll!UGameInstance::StartGameInstance() [C:\Unreal\Engine\Source\Runtime\Engine\Private\GameInstance.cpp:659]
LogWindows: Error: [Callstack] 0x00007ffd701e47f1 UnrealEditor-Engine.dll!UGameEngine::Start() [C:\Unreal\Engine\Source\Runtime\Engine\Private\GameEngine.cpp:1223]
LogWindows: Error: [Callstack] 0x00007ff609782eec UnrealEditor.exe!FEngineLoop::Init() [C:\Unreal\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4919]
LogWindows: Error: [Callstack] 0x00007ff6097ae255 UnrealEditor.exe!GuardedMain() [C:\Unreal\Engine\Source\Runtime\Launch\Private\Launch.cpp:164]
LogWindows: Error: [Callstack] 0x00007ff6097ae42a UnrealEditor.exe!GuardedMainWrapper() [C:\Unreal\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:118]
LogWindows: Error: [Callstack] 0x00007ff6097b18a4 UnrealEditor.exe!LaunchWindowsStartup() [C:\Unreal\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:258]
LogWindows: Error: [Callstack] 0x00007ff6097c70c4 UnrealEditor.exe!WinMain() [C:\Unreal\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:298]
LogWindows: Error: [Callstack] 0x00007ff6097ca37a UnrealEditor.exe!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
LogWindows: Error: [Callstack] 0x00007ffe395d7344 KERNEL32.DLL!UnknownFunction []
LogWindows: Error:

quoicoubehquebec · July 1, 2024, 5:38pm

Looks like the water dll fails to load

quoicoubehquebec · July 2, 2024, 6:50pm

Clearing intermediate, binaries, build and saved and rebuilding didn’t work. Right now i am trying to replicate this in a minimal project.

Fafhrd · July 3, 2024, 1:57am

Looks like it’s not creating a valid StaticMesh in the WaterBodyMeshBuilder, though it should only be running any of that code if WITH_EDITOR is true.

You could try packaging the Dedicated Server and see if it crashes the same way.

quoicoubehquebec · July 4, 2024, 8:25pm

Thanks, when packaged it runs correctly, but the server is not found by the client.
The client gives me a log line with something like:
Server [My public IP] failed to respond
Before i had the water issue i had this issue, which i fixed, clients could connect to the server. And i started having the water issue when i made the server’s map contain water. No clue how i fixed it though. Maybe the reason it stopped working is linked to the fact that my .ini files keep changing by themselves?

quoicoubehquebec · July 5, 2024, 1:00am

I have the same DLL issue in the EOS based dedicated server i made, but i can connect to it when the game is packaged. Although i would like a more definitive fix for this issue, as having to package everytime i want to test out a change harms productivity by a lot.

Fafhrd · July 5, 2024, 8:39am

I think you’re going to have to make an engine change to make it work with editor binaries.

Looks to me like the best spot is in WaterBodyComponent.cpp in UWaterBodyComponent::UpdateWaterInfoMeshComponents.

Add in a dedicated server check that returns out of the function before it gets to the meshbuilder call.

Also would be a good idea to report the issue in the bug tracker.

quoicoubehquebec · July 9, 2024, 5:57pm

Worked! I added an early return before it that checked if we were on a dedicated server.

GamesByHyper_Eric · July 16, 2024, 1:00pm

@OP, did you report this bug to the bug tracker? Can you share the tracker number?

dev-hyper · July 20, 2024, 5:49am

I made a quick PR here: https://github.com/EpicGames/UnrealEngine/pull/12152

RoeyBorsteinas1 · July 25, 2024, 2:49pm

Hi there,
This issue was resolved on UE5 Main recently with the following commit: https://github.com/EpicGames/UnrealEngine/commit/4d5e43ad62af22590d052de59b1b970c45d9069f

system · August 24, 2024, 2:50pm

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