Crash in FRenderAssetStreamingManager::UpdateResourceStreaming due to invalid array index

Development Rendering
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We ran into a crash in FRenderAssetStreamingManager::UpdateResourceStreaming due to an invalid array index:

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The TextureIndex in InflightRenderAssets is bigger than the number of elements in StreamingRenderAssets.

I think this happens in PIE mode when reimporting a texture on which Texture->StreamIn() is being called. (see repro steps)

The call stack is:

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\jenkins\Build\Game\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 1067]

Array index out of bounds: 1350 into an array of size 1350

Unhandled Exception: 0x00004000

CALLSTACK

UnrealEditor_Core!FDebug::CheckVerifyFailedImpl2() [D:\jenkins\Build\Game\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:1018]

UnrealEditor_Engine!FRenderAssetStreamingManager::UpdateResourceStreaming() [D:\jenkins\Build\Game\Engine\Source\Runtime\Engine\Private\Streaming\StreamingManagerTexture.cpp:2041]

UnrealEditor_Engine!FStreamingManagerCollection::UpdateResourceStreaming() [D:\jenkins\Build\Game\Engine\Source\Runtime\Engine\Private\ContentStreaming.cpp:915]

UnrealEditor_Engine!IStreamingManager::Tick() [D:\jenkins\Build\Game\Engine\Source\Runtime\Engine\Private\ContentStreaming.cpp:744]

UnrealEditor_Engine!FStreamingManagerCollection::Tick() [D:\jenkins\Build\Game\Engine\Source\Runtime\Engine\Private\ContentStreaming.cpp:887]

UnrealEditor_UnrealEd!UEditorEngine::Tick() [D:\jenkins\Build\Game\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:2472]

UnrealEditor_UnrealEd!UUnrealEdEngine::Tick() [D:\jenkins\Build\Game\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:533]

UnrealEditor!FEngineLoop::Tick() [D:\jenkins\Build\Game\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5770]

UnrealEditor!GuardedMain() [D:\jenkins\Build\Game\Engine\Source\Runtime\Launch\Private\Launch.cpp:196]

UnrealEditor!GuardedMainWrapper() [D:\jenkins\Build\Game\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:129]

UnrealEditor!LaunchWindowsStartup() [D:\jenkins\Build\Game\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:305]

UnrealEditor!WinMain() [D:\jenkins\Build\Game\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:364]

UnrealEditor!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]

kernel32!BaseThreadInitThunk()

ntdll!RtlUserThreadStart()

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Steps to Reproduce
Unfortunately, I can’t provide a repro in vanilla UE for the issue but I can describe how we reproduced it in our game:

  • Enter PIE
  • Make sure the texture gets streamed in. We have a system to stream in VFX textures that are soon going to be needed.
  • Open the VFX
  • Open the Texture
  • Reimport the texture
  • If it didn’t crash, make some changes to the source file (png) and reimport again.
  • Repeat the last step if necessary.

Usually this will trigger it after 4 attempts or so.

The texture needs to be streamable but non-virtual:

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3

Hello,

Thank you for reaching out.

I’ve been assigned this issue, and we will be looking into this array out of bounds exception for you.

4

Hello,

We were unable to reproduce the crash you described.

Can you please send us a minimal test project that demonstrates this crash?

The guide for test projects:

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5

Thank you for giving it a try, Stephen.

Unfortunately, we won’t be able to make time to attempt a repro on vanilla for a few weeks. We’ll follow up here if and when we attempt as much.