Control connection to memcached on 'ns_1@10.3.2.205' disconnected when run smoke test on windows 7 32 bit

Run smoke test couchbase server 1.8.1-933 32bit on windows 7 professional 32 bit.
When run this test, there was only one test failed createbuckettests.CreateMembaseBucketsTests.test_default_case_sensitive_dedicated
I reran this test manually and it passed.
When I look at diag log, there are many memcached crashed report in log.

Control connection to memcached on 'ns_1@10.3.2.205' disconnected: {badmatch,\n {error,\n closed}}") because it's been seen 1 times in the past 46.795999 secs (last seen 46.795999 secs ago
[ns_server:debug] [2012-06-22 19:20:05] [ns_1@10.3.2.205:<0.8941.0>:ns_pubsub:do_subscribe_link:132] Parent process exited with reason shutdown
[ns_server:debug] [2012-06-22 19:20:05] [ns_1@10.3.2.205:<0.8941.0>:ns_pubsub:do_subscribe_link:145] Deleting

{ns_pubsub,#Ref<0.0.1.254777>}

event handler: ok
[ns_server:debug] [2012-06-22 19:20:05] [ns_1@10.3.2.205:<0.8939.0>:ns_pubsub:do_subscribe_link:132] Parent process exited with reason shutdown
[ns_server:debug] [2012-06-22 19:20:05] [ns_1@10.3.2.205:<0.8939.0>:ns_pubsub:do_subscribe_link:145] Deleting

{ns_pubsub,#Ref<0.0.1.254745>}

event handler: ok
[error_logger:error] [2012-06-22 19:20:05] [ns_1@10.3.2.205:error_logger:ale_error_logger_handler:log_report:72]
=========================CRASH REPORT=========================
crasher:
initial call: erlang:apply/2
pid: <0.8936.0>
registered_name: []
exception error: no match of right hand side value

{error,closed}
in function mc_binary:quick_stats_recv/3
in call from mc_binary:quick_stats_loop/5
in call from mc_binary:quick_stats/5
in call from ns_memcached:do_handle_call/3
in call from ns_memcached:worker_loop/3
ancestors: ['ns_memcached-default','single_bucket_sup-default',
<0.8912.0>]
messages: []
links: [<0.8914.0>]
dictionary: []
trap_exit: false
status: running
heap_size: 10946
stack_size: 24
reductions: 588069
neighbours:

[error_logger:error] [2012-06-22 19:20:05] [ns_1@10.3.2.205:error_logger:ale_error_logger_handler:log_msg:76] ** Generic server 'ns_memcached-default' terminating
** Last message in was {'EXIT',<0.8936.0>,{badmatch,{error,closed}

}}

• • When Server state == {state,2,0,0,
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    {[],[]}

    ,
    

    {[],[]}

    ,
    connected,