Found this problem when run ITBLL with our internal branch which is based on branch-2.2. So mark this as a blocker for 2.2.0. A region 7ebdca9cd09e26074749b546586e2156 is moved from RS-st99 to RS-st98 and the TRSP succeed. Meanwhile, RS-st99 crashed and schedule a new SCP for RS-st99. So SCP initialized subprocedures for 7ebdca9cd09e26074749b546586e2156, too. Then the 7ebdca9cd09e26074749b546586e2156 was assigned to two RegionServers.