11 GB of GPU RAM used, and no process listed by nvidia-smi

Thanks, following your comment I tried

sudo nvidia-smi --gpu-reset -i 0

but it didn’t work:

Unable to reset this GPU because it’s being used by some other process (e.g. CUDA application, graphics application like X server, monitoring application like other instance of nvidia-smi). Please first kill all processes using this GPU and all compute applications running in the system (even when they are running on other GPUs) and then try to reset the GPU again.
Terminating early due to previous errors.

Any other ideas?

I’d rather avoid resetting the server, as other processes are running on it.

Thanks for your help,
Franck