[windows] Rebalance exited with reason {{bulk_set_vbucket_state_failed, {{badmatch,wrong_rebalancer_pid}

Rebalance exited with reason {{bulk_set_vbucket_state_failed, {{badmatch,wrong_rebalancer_pid} while rebalancing 1 node in and 1 node out.

Test to reproduce:

./testrunner -i vm-list.ini -t rebalance.rebalanceinout.RebalanceInOutTests.rebalance_in_out_at_once,default_bucket=True,standard_buckets=1,sasl_buckets=1,rep
licas=1,nodes_init=3,nodes_in=1,nodes_out=1,items=1000000,max_verify=50000


<0.21430.0>:ns_orchestrator:handle_info:319]Rebalance exited with reason {{bulk_set_vbucket_state_failed,
                               [{'ns_1@10.131.33.89',
                                 {'EXIT',
                                  {{badmatch,wrong_rebalancer_pid},


[error_logger:error,2013-03-20T4:31:25.652,ns_1@10.142.174.97:error_logger<0.6.0>:ale_error_logger_handler:log_report:72]
=========================CRASH REPORT=========================
  crasher:
    initial call: ns_single_vbucket_mover:mover/6
    pid: <0.7423.136>
    registered_name: []
    exception error: {bulk_set_vbucket_state_failed,
                      [{'ns_1@10.131.33.89',
                        {'EXIT',
                         {{badmatch,wrong_rebalancer_pid},
                          [{janitor_agent,set_vbucket_state,7},
                           {janitor_agent,'-bulk_set_vbucket_state/4-fun-0-',
                            4},
                           {misc,'-parallel_map/3-fun-0-',4}]}}}]}



[error_logger:error,2013-03-20T4:31:25.839,ns_1@10.142.174.97:error_logger<0.6.0>:ale_error_logger_handler:log_report:72]
=========================CRASH REPORT=========================
  crasher:
    initial call: ns_vbucket_mover:init/1
    pid: <0.13602.135>
    registered_name: []
    exception exit: {{bulk_set_vbucket_state_failed,
                      [{'ns_1@10.131.33.89',
                        {'EXIT',
                         {{badmatch,wrong_rebalancer_pid},
                          [{janitor_agent,set_vbucket_state,7},
                           {janitor_agent,'-bulk_set_vbucket_state/4-fun-0-',
                            4},
                           {misc,'-parallel_map/3-fun-0-',4}]}}}]},

Attaching collect_info and testrunner logs.