I have had some ec backed Mimic RBD's mounted via the kernel module on a Ubuntu 14.04 VM, these have been running no issues after updating the kernel to 4.12 to support EC features.
Today I run an apt dist-upgrade which upgraded from 12.2.9 to 12.2.10, since then I have been getting the following line in the syslog and had to role back to using rbd-nbd for the moment which continues to work fine.
Not sure if there is a change in 12.2.10 that this is expected with a non mimic kernel client such as Luminous.
Error in VM syslog:
feature set mismatch, my 40107b86a842ada < server's 60107b86aa42ada, missing 200000000200000
libceph: mon2 176.9.86.219:6789 missing required protocol features
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