windows - constant restarts of mb_master during small scale performance tests

Restarts happen on 1 or 2 nodes every time I run tests, usually with the same error.
No problems with loading data and initial indexing. Why does it happen?


[ns_server:info,2012-11-06T12:43:31.635,ns_1@10.2.3.31:mb_master<0.18558.13>:mb_master:terminate:288]Synchronously shutting down child mb_master_sup
[error_logger:error,2012-11-06T12:43:32.745,ns_1@10.2.3.31:error_logger<0.5.0>:ale_error_logger_handler:log_report:72]
=========================SUPERVISOR REPORT=========================
     Supervisor: {local,mb_master_sup}
     Context: shutdown_error
     Reason: killed
     Offender: [{pid,<0.19815.13>},
                  {name,ns_orchestrator},
                  {mfargs,{ns_orchestrator,start_link,[]}},
                  {restart_type,permanent},
                  {shutdown,20},
                  {child_type,worker}]


[stats:warn,2012-11-06T12:43:32.651,ns_1@10.2.3.31:system_stats_collector<0.478.0>:system_stats_collector:handle_info:133]lost 7 ticks
[ns_server:debug,2012-11-06T12:43:33.495,ns_1@10.2.3.31:<0.18559.13>:ns_pubsub:do_subscribe_link:132]Parent process of subscription {ns_config_events,<0.18558.13>} exited with reason {timeout,
                                                                                   {gen_server,
                                                                                    call,
                                                                                    [ns_node_disco,
                                                                                     nodes_wanted]}}
[error_logger:error,2012-11-06T12:43:34.073,ns_1@10.2.3.31:error_logger<0.5.0>:ale_error_logger_handler:log_msg:76]** State machine mb_master terminating
** Last message in was send_heartbeat
** When State == master
** Data == {state,<0.19814.13>,'ns_1@10.2.3.31',
                        ['ns_1@10.2.3.31','ns_1@10.2.3.33','ns_1@10.2.3.34',
                         'ns_1@10.2.3.35'],
                        {1352,234605,120106}}
** Reason for termination =
** {timeout,{gen_server,call,[ns_node_disco,nodes_wanted]}}

[ns_server:debug,2012-11-06T12:43:35.166,ns_1@10.2.3.31:ns_server_sup<0.385.0>:mb_master:check_master_takeover_needed:144]Sending master node question to the following nodes: ['ns_1@10.2.3.35',
                                                      'ns_1@10.2.3.34',
                                                      'ns_1@10.2.3.33']
[error_logger:error,2012-11-06T12:43:35.276,ns_1@10.2.3.31:error_logger<0.5.0>:ale_error_logger_handler:log_report:72]
=========================CRASH REPORT=========================
  crasher:
    initial call: mb_master:init/1
    pid: <0.18558.13>
    registered_name: mb_master
    exception exit: {timeout,{gen_server,call,[ns_node_disco,nodes_wanted]}}
      in function gen_fsm:terminate/7
    ancestors: [ns_server_sup,ns_server_cluster_sup,<0.66.0>]
    messages: [send_heartbeat,send_heartbeat,send_heartbeat,send_heartbeat,
                  {#Ref<0.0.372.79904>,
                   ['ns_1@10.2.3.31','ns_1@10.2.3.33','ns_1@10.2.3.34',
                    'ns_1@10.2.3.35']}]
    links: [<0.385.0>,<0.18559.13>,<0.63.0>]
    dictionary: []
    trap_exit: true
    status: running
    heap_size: 377
    stack_size: 24
    reductions: 147300
  neighbours:

[error_logger:error,2012-11-06T12:43:35.307,ns_1@10.2.3.31:error_logger<0.5.0>:ale_error_logger_handler:log_report:72]
=========================SUPERVISOR REPORT=========================
     Supervisor: {local,ns_server_sup}
     Context: child_terminated
     Reason: {timeout,{gen_server,call,[ns_node_disco,nodes_wanted]}}
     Offender: [{pid,<0.18558.13>},
                  {name,mb_master},
                  {mfargs,{mb_master,start_link,[]}},
                  {restart_type,permanent},
                  {shutdown,infinity},
                  {child_type,supervisor}]


[ns_server:error,2012-11-06T12:43:35.323,ns_1@10.2.3.31:<0.788.0>:ns_memcached:verify_report_long_call:297]call {stats,<<>>} took too long: 10203000 us
[couchdb:error,2012-11-06T12:43:41.588,ns_1@10.2.3.31:<0.24345.2>:couch_log:error:42]Uncaught error in HTTP request: {exit,
                                 {timeout,{gen_server,call,[ns_config,get]}}}

Stacktrace: [{diag_handler,diagnosing_timeouts,1},
             {menelaus_auth,check_auth,1},
             {menelaus_auth,bucket_auth_fun,1},
             {menelaus_auth,is_bucket_accessible,2},
             {capi_frontend,do_db_req,2},
             {couch_httpd,handle_request,6},
             {mochiweb_http,headers,5},
             {proc_lib,init_p_do_apply,3}]
[error_logger:error,2012-11-06T12:43:41.604,ns_1@10.2.3.31:error_logger<0.5.0>:ale_error_logger_handler:log_msg:76]** Generic server disksup terminating
** Last message in was timeout
** When Server state == [{data,[{"OS",{win32,nt}},
                                {"Timeout",60000},
                                {"Threshold",80},
                                {"DiskData",
                                 [{"C:\\",52324348,51},
                                  {"E:\\",268432380,14}]}]}]
** Reason for termination ==
** {timeout,{gen_server,call,[os_mon_sysinfo,get_disk_info]}}