Memtest86 does not go beyond "getting memory controller details"

[David (PassMark)]

Sounds similar to this issue, which we had thought was a one off issue.

Can you post the debug log from MemTest86
https://www.memtest86.com/tech_debug-logs.html

[CFG278]

Since a couple of days I have kernel panics with a brand new iMac 2020 (64 GB RAM) running macOS Big Sur. To rule out if the RAM is defective, I wanted to run Memtest86 from the USB stick. Unfortunately, the boot process does not go beyond "getting memory controller details". The process gets stuck. Is there something I can do?

Thanx,
Gerson Nerger (CFG27