rebalalance hangs after {badmatch,{error,timeout}} (FailoverTests.test_failover_firewall test)

version=2.0.0-1427-rel
test: http://qa.hq.northscale.net/job/centos-failover-tests/53/consoleFull

[error_logger:error] [2012-07-11 16:01:29] [ns_1@10.1.3.114:error_logger:ale_error_logger_handler:log_report:72]
=========================CRASH REPORT=========================
crasher:
initial call: ns_memcached:init/1
pid: <0.23869.0>
registered_name: 'ns_memcached-default'
exception exit: badmatch,{error,timeout,
[

{mc_client_binary,cmd_binary_vocal_recv,5}

,

{mc_client_binary,select_bucket,2}

,

{ns_memcached,ensure_bucket,2}

,

{ns_memcached,handle_info,2}

,

{gen_server,handle_msg,5}

,

{proc_lib,init_p_do_apply,3}

]}
in function gen_server:terminate/6
ancestors: ['ns_memcached_sup-default','single_bucket_sup-default',
<0.23866.0>]
messages: [{'$gen_call',

{<0.370.0>,#Ref<0.0.12.32838>}

,connected},
{'$gen_call',

{<0.2405.2>,#Ref<0.0.12.32843>}

,topkeys},
{'$gen_call',

{<0.370.0>,#Ref<0.0.12.34245>}

,connected},
check_config,
{'$gen_call',

{<0.370.0>,#Ref<0.0.12.37478>}

,connected},
{'$gen_call',

{<0.370.0>,#Ref<0.0.12.38972>}

,connected},
check_config,
{'$gen_call',

{<0.370.0>,#Ref<0.0.12.40378>}

,connected},
{'$gen_call',

{<0.370.0>,#Ref<0.0.12.41914>}

,connected},
{'$gen_call',{<0.2533.2>,
{#Ref<0.0.12.42183>,'ns_1@10.1.3.114'}},
{stats,<<"checkpoint">>}},
check_config]
links: [<0.23874.0>,<0.23876.0>,<0.23877.0>,<0.23875.0>,<0.56.0>,
<0.23868.0>]
dictionary: []
trap_exit: true