This looks a lot like a bug I fixed a week or so ago, but for which I currently don't recall the ticket off the top of my head. It was basically a crash each time a "ceph osd df" was called, if a mgr was not available after having set the luminous osd require flag. I will check the log in the morning to figure out whether you need to upgrade to a newer version or if this is a corner case the fix missed. In the mean time, check if you have ceph-mgr running, because that's the easy work around (assuming it's the same bug).
-Joao
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