Failed to create file ShaderCode-Global-PCD3D_SM6-PCD3D_SM6.ushaderbytecode

Development Pipeline & Plugins
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Hi,

we are using Unreal Engine 5.7.2, Horde and UBA (+ UBA cache). We have a very random crash in the cook phase to save .ushaderbytecode. It all started after the update on 5.7.2 (I did not see it in 5.6). I have no repro steps; it is very random and appears not to be related to any specific Horde agents.

LogShaderSymbolExport: Display: Shader symbol export enabled. Output directory: “D:/workspace/Sync/Game/Saved/ShaderSymbols/PCD3D_SM6”

LogOutputDevice: Error:

Script Stack (0 frames) :

LogWindows: Error: appError called: Fatal error: [File:D:\workspace\Sync\Engine\Source\Runtime\Core\Private\HAL\FileManagerGeneric.cpp] [Line: 123]

Failed to create file: ../../../Game/Saved/Shaders/PCD3D_SM6-PCD3D_SM6/ShaderCode-Global-PCD3D_SM6-PCD3D_SM6.ushaderbytecode

Thank you

Marek N

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Hi,

This could be caused by a file access issue. Could you have a virus or malware scanner that prevents the file from being created? FWindowsPlatformFile::OpenWrite is trying to open the file with exclusive access which will fail if the file already exists and is opened by another process.

You can use a tool called ProcMon to track file access at the system level: https://learn.microsoft.com/en\-us/sysinternals/downloads/procmon

It is easier if you set a fairly restrictive filter so you only get the logs that are interesting.

Regards,

Martin

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