b=6398

b=6398

 - target_start_recovery_thread() starts a thread and must wait for
   completion because that thread sets recovering flag. but routine
   kernel_thread() returns pid > 0 in successful case, while the
   target_start_recover_thread() expects 0. so, first routine
   target_start_recovery_thread() returns immediately and chain
   mds_postsetup() -> mds_dt_connect() is called with obd_recovering==0.
   so, mds_postrecov_common() is called and it calls mds_cleanup_orphans()