Hi Haomai, I'm looking at http://tracker.ceph.com/issues/12908 which has popped up a couple times in the last couple days. I really looks like the pg_query_t::sent_epoch is filled with a bogus value... causing it to try to generate history from before the pg was created. My guess is that the encode_payload() call is getting passed no features, triggering the legacy encoding.. but the msg header.version is still getting filled in with 3? Is that possible? Thanks! sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html