Weird crash when unloading a scene, while loading a previous one. [UWP] [Xbox]

The game is a UWP Game running on an Xbox ONE S using Unity 2020.1.13f and VS 2019. Each of my levels have their own scene. When they exit, they return to the main menu scene. I load main menu async. My loading screen shows it loaded 90% them boom. It does not crash in a Debug build however. Also no issues in the Editor. Every level scene does this both when loading Main Menu or if reloading itself.

Everything I tried for a stack dump has failed. The call stack shows:

UnityPlayer.dll!DebugStringToFilePostprocessedStacktrace(struct DebugStringToFileData const &) Unknown
UnityPlayer.dll!DebugStringToFile(struct DebugStringToFileData const &) Unknown
> UnityPlayer.dll!MemoryManager::WarnAdditionOverflow(enum AllocateOptions) Unknown
UnityPlayer.dll!MemoryManager::Allocate(unsigned __int64,unsigned __int64,struct MemLabelId,enum AllocateOptions,char const *,int) Unknown
UnityPlayer.dll!operator new[](unsigned __int64) Unknown
UnityPlayer.dll!LightmapSettings::Rebuild(void) Unknown
UnityPlayer.dll!LightmapSettings::RemoveLightmaps(int) Unknown
UnityPlayer.dll!DidUnloadScene(int) Unknown
UnityPlayer.dll!RuntimeSceneManager::UnloadAllScenesWithoutDestroyingGameObjects(void (*)(class UnityScene &)) Unknown
UnityPlayer.dll!UnloadGameScene(void) Unknown
UnityPlayer.dll!LoadSceneOperation: PlayerLoadSceneFromThread(void) Unknown
UnityPlayer.dll!LoadSceneOperation::IntegrateMainThread(void) Unknown
UnityPlayer.dll!PreloadManager::UpdatePreloadingSingleStep(enum PreloadManager::UpdatePreloadingFlags,int) Unknown
UnityPlayer.dll!PreloadManager::UpdatePreloading(void) Unknown
UnityPlayer.dll!ExecutePlayerLoop(struct NativePlayerLoopSystem *) Unknown
UnityPlayer.dll!ExecutePlayerLoop(struct NativePlayerLoopSystem *) Unknown
UnityPlayer.dll!PlayerLoop(void) Unknown
UnityPlayer.dll!UnityPlayer::AppCallbacks: DoPerformUpdateAndRender(void) Unknown
UnityPlayer.dll!UnityPlayer::AppCallbacks::_AppThreadImplementation(void *) Unknown
ntdll.dll!00007ffd914415ef() Unknown

Looks like it is related to lighting but I have no idea what to do about it.

 

Update:

Disabling baked lighting causes it not to happen. Both Progressive and Enlighten do it, though the call stack is slightly different with enlighten. So it is definitely related to lighting.

It also only occurs on the Xbox One. If I run the UWP on a Windows 10 PC it does not happen.

 

Yes, I will

 

Bug # 1318134
Sorry it took so long but I had to wait until I had time to make a small example which turned out to be easier than I thought since it happens 100% of the time if light mapping is used. It is currently impossible to make a UWP for the Xbox if lightmapping is used.

 

I ran into this problem on a UWP master build. Using this code before a scene load seemed to get around the problem:

LightmapSettings.lightmaps = new LightmapData[0];
Resources.UnloadUnusedAssets();

 

I also have this bug in Unity 2020.3.12f1! For Windows.

Was it fixed in Unity 2021?

 

@perchangpete Your Workaround worked! Thanks!

 

Perfect. Unity was not helpful. They could not reproduce this. I sent them a simple project that does it and their only suggestion was thinking I had changed the sample after sending it to them to cause this. Your solution fixed it so I can now use the 2020 editor on UWP.

 

Thank you @perchangpete

That worked for me as a temporary fix.

 

Does this you put the code in Awake method? I think I might be having the same issue.

 

You put that right before you call loadscene.

 

FWIW - Unity fixed this a month or so back and the fix certainly worked for me (using the 2020.3 LTS builds)

 

thank you. Sadly im using unity 2019.28.f1. Also everything works fine on my Xbox1 Slim. However the new xbox X, like PS5. Always crashes when it comes to entering my name in the main menu.

 

I am testing out on 2020.3.29f1 and the issue still persists! Game is still crashing on scene load.