Fatal glibc error: CPU does not support x86-64-v2

[webadmin-psychologie]

Hi
I get this error "Fatal glibc error: CPU does not support x86-64-v2" inside container with latest version (amd64).
Any ideas how to fix this?
Thanks

[kristian-lange]

Are you sure you got the correct docker image for your CPU? JATOS has amd64 and arm64.
Best,
Kristian

[webadmin-psychologie]

Hi Kristian, thanks for your response.
Yes, pretty sure, when I inspect the downloaded "jatos/jatos:latest" image, I see "Architecture": "amd64". Perhaps important to know, Docker runs inside a VM with the default CPU settings "kvm64", do I need to select a specific CPU type or enable certain CPU flags?
Best, Pete

[kristian-lange]

Hm, strange. I'm not a docker expert. It runs on mine, Ubuntu 22.04 with an AMD processor, no VM.

I found this GH issue: ansible/awx#11879. There they recommend "play with CPU driver settings" and change the "cpu emulation/driver" from "kvm64" to "host-passthrough". Whatever that means.

[webadmin-psychologie]

Well thanks, I was thinking about that, I will try it and let you know.

[webadmin-psychologie]

With the CPU driver setting "host-passthrough" it works, but of course this variant is not ideal because the VM can no longer be safely moved to another host. So it would still be good to know which CPU flags are needed to check which CPU family supports them.

[kristian-lange]

That's already something. But I understand the problem, you want to be able to move the VM. But I'm honestly lost here.

[webadmin-psychologie]

Here some links which helped me:

https://qemu-project.gitlab.io/qemu/system/qemu-cpu-models.html
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/x86/include/asm/cpufeatures.h

And here the required cpu flags to be compatible:

CPU supports x86-64-v2: cx16, lahf, popcnt, sse4_1, sse4_2, ssse3
CPU supports x86-64-v3: avx, avx2, bmi1, bmi2, f16c, fma, abm, movbe, xsave
CPU supports x86-64-v4: avx512f, avx512bw, avx512cd, avx512dq, avx512vl

Hope this info is useful for others with the same issue.