AMD Instability Starting @ 25.3.1

Development Rendering
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On an AMD RX 6800 XT GPU, starting with driver version 25.3.1, one of our levels started crashing any time it was opened. After testing individual project setting changes, I figured out it was due to Virtual Shadow Maps being enabled with Hardware Ray Tracing support. If hardware ray tracing is turned off, the crash does not occur. If hardware ray tracing is used, but the shadow method is changed to Cascade Shadowmaps, the crash does not occur.

I turned on -d3ddebug, and there was no additional information that signaled an issue wth D3D12 calls. The crash is reported as a GPU hang. I extended the TDR and that did not fix the issue either. I attached Radeons developer tools, and that made the crash go away but new D3D12 validation errors pop up around heaps.

Reverting the driver to 25.2.1 made the crash go away.

I am working on putting together an equivalent test using an unmodified version of UE 5.5.4.

This bug was also reproducible on a RX 6900 XT with the same driver version.

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Hello,

Thanks for reporting this issue. I was unable to find any known issues with VSMs and HWRT in 5.5 and it sounds like a driver issue based on your description. If the issue is limited to specific drivers and hardware, I recommend that you add the driver to your AMD DriverDenyList, or use a DeviceProfileFragment to override the cvars used for that hardware. Hope that helps and please let me know if you have additional questions.