Hi, had same issue on DELL R720.
Actually I'm using Proxmox 7.
After some searching I found this:
https://community.mellanox.com/s/question/0D51T00006RVuXj/mlx4core-missing-uar-aborting
I confirm it solved the issue
for details, I also had to disable acpi, so I report my /etc/default/grub...