Crash when changing level with foliage

Development World Creation
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1

Hi!
My game crashes when I change from a large map that contains a sublevel with a lot of foliage, to another map or if I simply reload the level.
The render thread crashes always on the same destructor

FInstancedStaticMeshSceneProxy::~FInstancedStaticMeshSceneProxy() []

If I remove all the foliage the game doesn’t crash anymore.
It only happens outside the editor.
I have tried moving the foliage to a different map but the issue is still present.

Help.

Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/RenderCore/Private/RenderingThread.cpp] [Line: 853] 
Rendering thread exception:
Fatal error!

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x134c4410

0x00007ff7c02c8707 MyGame.exe!FInstancedStaticMeshSceneProxy::~FInstancedStaticMeshSceneProxy() []
0x00007ff7c02cb0d5 MyGame.exe!FHierarchicalStaticMeshSceneProxy::`scalar deleting destructor'() []
0x00007ff7bed7ff4c MyGame.exe!FScene::UpdateAllPrimitiveSceneInfos() []
0x00007ff7bed4369d MyGame.exe!TRDGLambdaPass<FGenerateSkyLightVisibilityRaysCS::FParameters,<lambda_b2336f278bcd1ed1ee1f0d3535b2ffb0> >::ExecuteImpl() []
0x00007ff7bd8a79e9 MyGame.exe!FNamedTaskThread::ProcessTasksNamedThread() []
0x00007ff7bd8a7d43 MyGame.exe!FNamedTaskThread::ProcessTasksUntilQuit() []
0x00007ff7bf5dca84 MyGame.exe!RenderingThreadMain() []
0x00007ff7bf5e1d7f MyGame.exe!FRenderingThread::Run() []
0x00007ff7bdcd653f MyGame.exe!FRunnableThreadWin::Run() []
0x00007ff7bdcd6234 MyGame.exe!FRunnableThreadWin::GuardedRun() []
0x00007ffdbc1f6fd4 KERNEL32.DLL!UnknownFunction []
0x00007ffdbe1bcec1 ntdll.dll!UnknownFunction []
2

Hi Toni,

Unfortunately, I’m unable to reproduce this issue in 4.24.3 Are you able to create a reproduction of this in a sample project?
Also, there have been changes to how destruction of instanced render data has been handled in 4.25.1, it might be worthwhile testing a copy of your project (or your repro project) there?

Cheers,
Alex

3

Hi Alex,
I don’t seem to have a way to reproduce it on another project. It seems the map got corrupt somehow.
I’ll try upgrading the project to 4.25 and I’ll let you know.

Thank you so much!

4

Upgradig to 4.25 seems to resolve the issue!
Now the camera exposure values are all over the place, but that’s a different topic. Thank you very much :slight_smile:

Toni.

5

Upgradig to 4.25 seems to resolve the issue! Now the camera exposure values are all over the place, but that’s a different topic. Thank you very much :slight_smile:

Toni.

6

Awesome, great to hear!

7

Hi, we’re experiencing the same issue but aren’t at a stage to upgrade to 4.25 yet. Is it possible for you to post the changelist that has a fix for this issue, so that we can try to integrate it into our project?

Thanks,