Just a heads up, since I know gkrellm is in EPEL and not in the main CentOS repos. However, something fairly fundamental has changed, as prior to updating, gkrellm worked fine, but now every time I execute gkrellm the kernel panics.
I'm going to triage on a different machine, as the panic corrupted at least one system library used by nautilus, but rpm -Va is your friend in these situations, and yum reinstall is its close kin. So I would prefer to duplicate on a burner machine, and I'll try to get a snapshot of the panic.
If anyone else wants to try to reproduce, simply try installing the current gkrellm from EPEL on a fully updated CentOS 7 machine and see if it panics on you. I kindof hope it's local to my machine and its configuration (/home is LUKS, for instance), and it would be great if someone could verify that.