FIO connection issue

Hi All, I recently experienced an issue while trying to use FIO on Ceph(master branch). When Ceph is started, the mon host is something like [v2:128.XXX.XXX.XXX:12345, v1:128.XXX.XXX.XXX:12346] if I try to use the FIO now, the “addr cannot be parsed” error will occur. Then I change the mon host to 128.XXX.XXX.XXX:12345, ceph will also show a connection error too. I checked the IP and port, which are used correctly. RBD bench works fine, only FIO has this issue. Please advice. Thanks, Yiming