[ 31.268661] nvidia-modeset: Allocated GPU:1 (GPU-2036e416-cc14-5930-94af-4551d710a469) @ PCI:0000:02:00.0
[ 34.430667] nvidia-modeset: Allocated GPU:2 (GPU-2cf46d34-d28f-2645-29cc-0f45d1d2b269) @ PCI:0000:03:00.0
[ 35.369842] nvidia-modeset: Allocated GPU:3 (GPU-eed9cfc2-0cbb-611c-4b77-0bec2ef35a39) @ PCI:0000:04:00.0
[ 36.912227] nvidia-modeset: Allocated GPU:4 (GPU-51b44856-679a-afb8-c0e7-89003090c253) @ PCI:0000:05:00.0
[ 37.774359] nvidia-modeset: Allocated GPU:5 (GPU-46d4cb16-f8c3-6cdd-af37-fb9cc74ff01e) @ PCI:0000:06:00.0
[ 48.862458] nvidia-uvm: Loaded the UVM driver in 8 mode, major device number 239
[ 5068.436901] perf: interrupt took too long (2587 _ 2500), lowering kernel.perf_event_max_sample_rate to 77250
[ 7905.657190] perf: interrupt took too long (3240 _ 3233), lowering kernel.perf_event_max_sample_rate to 61500
[17685.226213] perf: interrupt took too long (4052 _ 4050), lowering kernel.perf_event_max_sample_rate to 49250
[18337.010754] NVRM: GPU at PCI:0000:02:00: GPU-2036e416-cc14-5930-94af-4551d710a469
[18337.010762] NVRM: GPU Board Serial Number:
[18337.010768] NVRM: Xid (PCI:0000:02:00): 32, Channel ID 00000012 intr 00020000
[18337.011232] NVRM: Xid (PCI:0000:02:00): 32, Channel ID 00000012 intr 00020000
Rig is rebooting due to system error. It could be caused by too much overclock/undervolt.
Fortunately I have old SMOS images on hard drives.