Immediately after emerge --sync using xmu.edu.cn mirror, emerge portage says Last emerge --sync was 38d 6h 41m 7s ago, and cat /usr/portage/metadata/timestamp.chk says Mon, 25 Apr 2016 02:50:01 +0000 Reproducible: Didn't try
I can confirm this.. @acevery, can you help on this?
I don't think this mirror exists anymore.