Comment # 6 on bug 1214845 from Chris

(In reply to James Fehlig from comment #4)
> What did you upgrade from? It's been a while since memory accounting was
> disabled. From the systemd-default-settings package:

I don't remember the previous version of the kernel, but at worst it was a
month older.

> See /usr/lib/systemd/system.conf.d/__20-defaults-SUSE.conf. Please check if
> DefaultMemoryAccounting=no. If so, provide an override to enable it.

I changed that file content from "DefaultMemoryAccounting=no" to
"DefaultMemoryAccounting=yes" and now LXC is working fine.

So, as a summary of what I checked:
 - Clean installation -> LXC not working.
 - Old installation -> LXC not working.
 - Clean installation + cockpit with Podman containers -> LXC working.
 - Old installation + DefaultMemoryAccounting=yes -> LXC working.