No miners were affected since it was ckdb only, not ckpool.
Since it's so big it took 10 minutes (and 11 seconds) to crash (to write the core file)
It's on it's way back up again and should be all back to normal in less than 5 more minutes.
Edit: restart complete at 23:26:07.943 UTC
Edit2: yes I am working on fixing it so it doesn't happen due to the same cause again - the core dump showed clearly why (if anyone was wondering)
If you were running Windows your core file would've just said "I fell over"
Love it when *nix boxes provide a ton of info.