{UPR}:: Rebalance hanging during View Query + Rebalance tests

Jenkins Ref Link:
http://qa.sc.couchbase.com/job/ubuntu_x64--65_02--view_query_extended-P1/94/consoleFull

Test to Reproduce:
./testrunner -i <yourfile>.ini get-delays=True,get-cbcollect-info=True,GROUP=P1 -t view.viewquerytests.ViewQueryTests.test_employee_dataset_startkey_endkey_queries_rebalance_in,num_nodes_to_add=1,limit=1,skip_rebalance=true,GROUP=P1

2014-06-05 04:34:34 | INFO | MainProcess | Cluster_Thread | [rest_client.rebalance] rebalance params : password=password&ejectedNodes=&user=Administrator&knownNodes=ns_1%40172.23.106.196%2Cns_1%40172.23.106.197
2014-06-05 04:38:39 | INFO | MainProcess | Cluster_Thread | [rest_client._rebalance_progress] rebalance percentage : 46.875 %
....
2014-06-05 04:50:31 | INFO | MainProcess | Cluster_Thread | [rest_client._rebalance_progress] rebalance percentage : 46.875 %

Logs:

=========================CRASH REPORT=========================
crasher:
initial call: ns_memcached:init/1
pid: <0.11634.1>
registered_name: []
exception exit: {badmatch,{error,closed}}
in function gen_server:init_it/6 (gen_server.erl, line 328)
ancestors: ['single_bucket_sup-default',<0.11617.1>]
messages: []
links: [<0.11660.1>,<0.11662.1>,<0.11663.1>,<0.277.0>,<0.11618.1>]
dictionary: []
trap_exit: true
status: running
heap_size: 75113
stack_size: 27
reductions: 2856901
neighbours:
neighbour: [

{pid,<0.11663.1>}

,

{registered_name,[]},
{initial_call,{erlang,apply,['Argument__1','Argument__2']}},
{current_function,{gen,do_call,4}},
{ancestors,['ns_memcached-default', 'single_bucket_sup-default',<0.11617.1>]},
{messages,[]},
{links,[<0.11634.1>,#Port<0.11442>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,46422},
{stack_size,23},
{reductions,272768723}]
neighbour: [{pid,<0.11662.1>},
{registered_name,[]}

,
{initial_call,{erlang,apply,['Argument__1','Argument__2']}},
{current_function,{gen,do_call,4}},

{ancestors,['ns_memcached-default', 'single_bucket_sup-default',<0.11617.1>]},
{messages,[]},
{links,[<0.11634.1>,#Port<0.11443>]},
{dictionary,[]},
{trap_exit,false},
{status,waiting},
{heap_size,28690},
{stack_size,23},
{reductions,2905}]
neighbour: [{pid,<0.11660.1>},
{registered_name,[]},
{initial_call,{erlang,apply,['Argument__1','Argument__2']}},
{current_function,{gen,do_call,4}},
{ancestors,['ns_memcached-default', 'single_bucket_sup-default',<0.11617.1>]}

,

{messages,[]}

,

{links,[<0.11634.1>,#Port<0.11440>]}

,

{dictionary,[]}

,

{trap_exit,false}

,

{status,waiting}

,

{heap_size,46422}

,

{stack_size,23}

,

{reductions,258119319}

]

[error_logger:error,2014-06-05T4:52:22.360,ns_1@172.23.106.196:error_logger<0.6.0>:ale_error_logger_handler:do_log:207]Supervisor received unexpected message: {ack,<0.11634.1>,
{error,{badmatch,{error,closed}}}}

[ns_server:info,2014-06-05T4:52:22.498,ns_1@172.23.106.196:janitor_agent-default<0.11640.1>:janitor_agent:handle_info:817]Undoing temporary vbucket states caused by rebalance
[user:info,2014-06-05T4:52:22.499,ns_1@172.23.106.196:<0.1173.0>:ns_orchestrator:handle_info:480]Rebalance exited with reason {unexpected_exit,
{'EXIT',<0.23026.2>,
{{noproc,
{gen_server,call,
['replication_manager-default',

{upr_takeover,'ns_1@172.23.106.196',641},
infinity]}},
{gen_server,call,
[{'janitor_agent-default', 'ns_1@172.23.106.197'},
{if_rebalance,<0.6656.2>,
{wait_index_updated,655}},
infinity]}}}}

=========================CRASH REPORT=========================
crasher:
initial call: ns_single_vbucket_mover:upr_takeover/5-fun-0/0
pid: <0.29768.2>
registered_name: []
exception exit: {{noproc,
{gen_server,call,
['replication_manager-default',
{upr_takeover,'ns_1@172.23.106.196',641}

,
infinity]}},
{gen_server,call,
[

{'janitor_agent-default','ns_1@172.23.106.197'}

,
{if_rebalance,<0.6656.2>,
{upr_takeover,'ns_1@172.23.106.196',641}},
infinity]}}
in function gen_server:call/3 (gen_server.erl, line 188)
in call from ns_single_vbucket_mover:'upr_takeover/5-fun-0'/5 (src/ns_single_vbucket_mover.erl, line 307)
ancestors: [<0.23372.2>,<0.6656.2>,<0.6610.2>,<0.1173.0>,mb_master_sup,
mb_master,ns_server_sup,ns_server_cluster_sup,<0.59.0>]
messages: []
links: [<0.23372.2>]
dictionary: []
trap_exit: false
status: running
heap_size: 610
stack_size: 27
reductions: 125
neighbours:

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