ComfyUI crashes the whole Linux OS (AMD GPU)

### Custom Node Testing

- [x] I have tried disabling custom nodes and the issue persists (see [how to disable custom nodes](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled) if you need help)

### Expected Behavior

Not crashing

### Actual Behavior

I run Ubuntu 24.04 with 64G RAM and an Radeon RX 7800 XT GPU. ComfyUI was installed yesterday, v0.18.0 and rocm7.1.

No matter which template i use, the system will eventually crash. Text-to-Image takes a few runs. Animating an image crashes the system within a minute.

For thermal testing, i ran the GPU fan at full speed. When the crash happens, the fan turns off for a few seconds (and the screen goes blank). Screen and fan come back, but the system is locked up.

ComfyUI also uses way to much RAM. I had to add 20GB of swap just to run through like 3 or 4 text-to-image runs before running into problems. This memory leak issue may or may not be a separate problem.

This does NOT seem to be a hardware issue. I can run both Easy Diffusion and many demanding games (Satisfactory, U-Boat, Skyrim "whatever the newest edition is", Minecraft with high end renderers, Hogwards, ...) for hours on end without any problems. I can also run long, CPU-demanding tasks as well without problems, like compiling.

### Steps to Reproduce

See above

### Debug Logs

```powershell
I don't have them because the whole system crashes.
```

### Other

ComfyUI seems to be pretty unusable (in any mode) on my system for now. I'm going back to EasyDiffusion for the moment.