open driver failing with cuda_error_not_initialized, closed driver works

[zeronewb]

Tried 570.86.15,570.86.10, kernels 6.8,6.11, distro ubuntu 24.0.4.1, cuda 12.8

[zeronewb]

error: uvm_pmm_gpu.c:3203 devmem_init[pid:131863] request_free_mem_region() err -34
temp fix: uvm_disable_hmm=1

[E-Allie]

How did you obtain the uvm + request_free_mem_region() error?
i.e. How can one reproduce it?

[zeronewb]

Debug parameters for all nvidia modules via modrobe and nvregs

[zeronewb]

latest working kernel with hmm: 6.8.0-1010-nvidia