I would like to share a fix for a Rare GPU Crash in ScreenProbeCompositeTracesWithScatterCS. Crash is often reported as LumenScreenProbeGather crash in Nvidia Aftermath Breadcrumbs.
Shader Name = Global/FScreenProbeCompositeTracesWithScatterCS/5:/Engine/Private/Lumen/LumenScreenProbeFiltering.usf|ScreenProbeCompositeTracesWithScatterCS
You can ask me for additional information if you need.
Thanks for submitting a fix for this crash. How did you end up reproducing the issue? One reason we have not had much movement on our end regarding this bug is that we cannot reliably reproduce the crash. In any case, I have informed the team of your change, and they will review it as soon as possible and get back to you with any feedback they might have.
Thank you for a quick response. I don’t have exact repro. The issue was found in our crash reporting system and I was lucky enough it happens during automation game-play testing, which has Aftermath dumps always enabled. Looking forward for UE P4 CL or git commit to properly cherry pick it into our engine.
Cvars below were enabled during that specific run when we collected Aftermath data with nvdbg file, but I think the issue repeats without them too. We just were not lucky enough to collect nvdbg file that would tell us that in our earlier runs.
Ok, thanks for letting me know! This is still valuable information to share with the team, so I appreciate the effort you have made. I can’t give you an exact time on when the PR will be reviewed, and with the holidays and other deadlines coming up, the review might get pushed back into early next year (think end of January). If you haven’t heard anything from us by then, please give this ticket another ping, and I will try to move things along.