[SOLVED] crash/reboot at VM starting

Thanks for reporting back. Unfortunately, we didn't learn something new :-/

Have you showed them the mcelog output? What are valid OS's? What about trying them out and - hopefully - run into the same problem but now get support from Supermicro?
 
I showed them all: mcelogs, screens, bios settings. It seemed to me now, that they did not understand that I tested on a regular Debian too, not only Proxmox. Valid OS's - RedHat and OpenSuse. Yes. Tomorrow I'll try Centos (RH) - It will be the same error - 100%. May be OpenSuse too.
 
Problem solved! One of the two CPUs was defective!!! Virtualization does not work on it!!
Defective CPU's are indeed rare, especially such a specific defect.
Thanks Intel support!
Seller will replace the CPU.
 
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