Hi guys, I just updated my project (multiplayer game running on a dedicated server) from 5.2 to 5.3, and am now getting the crash below during gameplay (on the client side). I have no idea how to debug this…Seems related to something in DirectX 12? Any ideas what this could be? [2024.07.04-12.34.0…

Usually, when I have a nullptr somewhere, the log shows the location and class where this pointer belongs…but here, it’s directly showing the shader functions… I’m running the engine with a source build. How can I install this debug method on a source build? I’ll also be logging the shader variabl…

Oh right you are running from source. How are your system resources looking near crash time. Is there anything out of the ordinary? Hitting a memory limit, maybe cpu cores at 100%, switching to pagefile use?

I checked the memory and CPU (from Windows task manager), and everything is stable when the crash happens. No spikes. There was a spike on the SSD “Active Time”, but I guess that’s normal when an application crashes and the drive is working to close it.

How about graphics / power settings. Could it be that the gpu is going into power conserving mode on an adaptive plan causing the loss of RHI? (render hardware interface)

But if it was a problem of GPU, wouldn’t the crash also occur when I play locally (without using a dedicated server)? I got recommendation (from another social channel) to set r.Streaming.PoolSize in render settings to a high value. I had it at 1000, and then changed it to 30000. But the crash stil…

Are you running the server in headless mode or are you using the logging window? Graphics on the server shouldn’t really be required. Also have you tried maybe fixing up redirects in the server portion of the project? Perhaps there is some dangling resource causing the crash. An old bp or map that…

Yea, I’m currently using the -log command on the server. I didn’t see anything suspicious on the server, but I’ll trigger the crash again and save the server logs. So to clean the redirects, I usually right click on Contents folder, and click on Fix Up Redirectors…Is this the way to do it?

It seems that I can’t reproduce the problem on a different (smaller) map… That probably means there is something in the map that is causing the crash. Interesting because in 5.2, I never saw this issue.

Maybe a memory leak? That would explain why it crashes over time. Maybe check the vram load before crash? Normal memory might remain within normal parameters but it is the GPU that might be crashing so it might hit it’s memory limit.

Crazy crash happening in 5.3: "LogRHI: Error: Breadcrumbs 'RHIThread'"

Development Programming & Scripting Multiplayer & Networking

lucasr94 (LucasRodriguez) September 4, 2026, 12:55pm 50

I had the same problem. I posted my solution here. I hope it helps you. Cheers!