Hi! I'm having a system-specific issue. One of my GPUs (GTX 1080 Ti), stops rendering in the render preview with the cancel message. This only happens from the camera preview and render region enabled. I've tested multiple Nvidia drivers, tried rolling back and the latest one doesn't fix it. I've tried multiple blender versions including the latest 2.9 experimental. I've also set the TDR values to 60 and tried going higher.
I started noticing this issue after migrating my OS to an NVME from an SSD but I'm not sure if that has anything to do with this.
I'm hoping it's not my GPU as I've been rendering with it for a long time, it's stable, performs as it's supposed to and even now the preview render works perfectly. It's just the camera preview with enabled border cropping and zooming in that gives the cancel message and freezes blender if I try to exit it then.
I have another GTX 1080 Ti and it doesn't do this, I can't reproduce the issue with it. The GPU I'm having is in the 2nd PCIe slot I think and it appears to be 2nd in the CUDA panel in Blender. It doesn't matter if I'm using one or two GPUs, I still get the error. I'm fairly confident this isn't a hardware issue and that the GPUs are seated in properly. All the rendering works properly, it just freezes when I zoom in the camera preview with render region enabled.
I'll be attaching my logs in a comment below.