memcached crash when rebalance after add nodes

Install couchbase server 2.0.0dp4r-719 on 5 nodes windows server 2008 r2 64bit.
Create cluster and rebalance. Memcached crashed right after rebalance.

2012-02-29 19:34:43.848 menelaus_web:12:info:message(ns_1@10.1.2.69) - Created bucket "default" of type: membase

2012-02-29 19:34:45.911 ns_memcached:1:info:message(ns_1@10.1.2.69) - Bucket "default" loaded on node 'ns_1@10.1.2.69' in 0 seconds.
2012-02-29 19:34:57.864 ns_cluster:0:info:message(ns_1@10.1.2.69) - Started node add transaction by adding node 'ns_1@10.1.2.70' to nodes_wanted

2012-02-29 19:34:59.207 ns_node_disco:4:info:node up(ns_1@10.1.2.69) - Node 'ns_1@10.1.2.69' saw that node 'ns_1@10.1.2.70' came up.
2012-02-29 19:34:59.247 menelaus_sup:1:info:web start ok(ns_1@10.1.2.70) - Couchbase Server has started on web port 8091 on node 'ns_1@10.1.2.70'.
2012-02-29 19:34:59.263 ns_cluster:3:info:message(ns_1@10.1.2.70) - Node ns_1@10.1.2.70 joined cluster
2012-02-29 19:34:59.348 ns_cluster:0:info:message(ns_1@10.1.2.69) - Started node add transaction by adding node 'ns_1@10.1.2.71' to nodes_wanted

2012-02-29 19:34:59.895 ns_node_disco:4:info:node up(ns_1@10.1.2.69) - Node 'ns_1@10.1.2.69' saw that node 'ns_1@10.1.2.71' came up.
2012-02-29 19:34:59.922 menelaus_sup:1:info:web start ok(ns_1@10.1.2.71) - Couchbase Server has started on web port 8091 on node 'ns_1@10.1.2.71'.
2012-02-29 19:34:59.968 ns_cluster:3:info:message(ns_1@10.1.2.71) - Node ns_1@10.1.2.71 joined cluster
2012-02-29 19:35:00.051 ns_cluster:0:info:message(ns_1@10.1.2.69) - Started node add transaction by adding node 'ns_1@10.1.2.72' to nodes_wanted

2012-02-29 19:35:00.169 ns_node_disco:4:info:node up(ns_1@10.1.2.70) - Node 'ns_1@10.1.2.70' saw that node 'ns_1@10.1.2.71' came up.
2012-02-29 19:35:00.172 ns_node_disco:4:info:node up(ns_1@10.1.2.71) - Node 'ns_1@10.1.2.71' saw that node 'ns_1@10.1.2.70' came up.
2012-02-29 19:35:01.161 ns_node_disco:4:info:node up(ns_1@10.1.2.69) - Node 'ns_1@10.1.2.69' saw that node 'ns_1@10.1.2.72' came up.
2012-02-29 19:35:01.187 menelaus_sup:1:info:web start ok(ns_1@10.1.2.72) - Couchbase Server has started on web port 8091 on node 'ns_1@10.1.2.72'.
2012-02-29 19:35:01.203 ns_cluster:3:info:message(ns_1@10.1.2.72) - Node ns_1@10.1.2.72 joined cluster
2012-02-29 19:35:01.301 ns_cluster:0:info:message(ns_1@10.1.2.69) - Started node add transaction by adding node 'ns_1@10.1.2.73' to nodes_wanted

2012-02-29 19:35:01.388 ns_node_disco:4:info:node up(ns_1@10.1.2.70) - Node 'ns_1@10.1.2.70' saw that node 'ns_1@10.1.2.72' came up.
2012-02-29 19:35:01.390 ns_node_disco:4:info:node up(ns_1@10.1.2.72) - Node 'ns_1@10.1.2.72' saw that node 'ns_1@10.1.2.70' came up.
2012-02-29 19:35:01.546 ns_node_disco:4:info:node up(ns_1@10.1.2.72) - Node 'ns_1@10.1.2.72' saw that node 'ns_1@10.1.2.71' came up.
2012-02-29 19:35:01.547 ns_node_disco:4:info:node up(ns_1@10.1.2.71) - Node 'ns_1@10.1.2.71' saw that node 'ns_1@10.1.2.72' came up.
2012-02-29 19:35:02.145 ns_node_disco:4:info:node up(ns_1@10.1.2.69) - Node 'ns_1@10.1.2.69' saw that node 'ns_1@10.1.2.73' came up.
2012-02-29 19:35:02.187 menelaus_sup:1:info:web start ok(ns_1@10.1.2.73) - Couchbase Server has started on web port 8091 on node 'ns_1@10.1.2.73'.
2012-02-29 19:35:02.218 ns_cluster:3:info:message(ns_1@10.1.2.73) - Node ns_1@10.1.2.73 joined cluster
2012-02-29 19:35:02.223 ns_orchestrator:4:info:message(ns_1@10.1.2.69) - Starting rebalance, KeepNodes = ['ns_1@10.1.2.71','ns_1@10.1.2.69',
                                 'ns_1@10.1.2.73','ns_1@10.1.2.72',
                                 'ns_1@10.1.2.70'], EjectNodes = []


2012-02-29 19:35:02.419 ns_node_disco:4:info:node up(ns_1@10.1.2.70) - Node 'ns_1@10.1.2.70' saw that node 'ns_1@10.1.2.73' came up.
2012-02-29 19:35:02.421 ns_node_disco:4:info:node up(ns_1@10.1.2.73) - Node 'ns_1@10.1.2.73' saw that node 'ns_1@10.1.2.70' came up.
2012-02-29 19:35:02.437 ns_node_disco:4:info:node up(ns_1@10.1.2.71) - Node 'ns_1@10.1.2.71' saw that node 'ns_1@10.1.2.73' came up.
2012-02-29 19:35:02.437 ns_node_disco:4:info:node up(ns_1@10.1.2.73) - Node 'ns_1@10.1.2.73' saw that node 'ns_1@10.1.2.71' came up.
2012-02-29 19:35:02.452 ns_node_disco:4:info:node up(ns_1@10.1.2.73) - Node 'ns_1@10.1.2.73' saw that node 'ns_1@10.1.2.72' came up.
2012-02-29 19:35:02.453 ns_node_disco:4:info:node up(ns_1@10.1.2.72) - Node 'ns_1@10.1.2.72' saw that node 'ns_1@10.1.2.73' came up.
2012-02-29 19:35:04.499 ns_memcached:1:info:message(ns_1@10.1.2.73) - Bucket "default" loaded on node 'ns_1@10.1.2.73' in 0 seconds.
2012-02-29 19:35:04.513 ns_memcached:1:info:message(ns_1@10.1.2.70) - Bucket "default" loaded on node 'ns_1@10.1.2.70' in 0 seconds.
2012-02-29 19:35:04.531 ns_memcached:1:info:message(ns_1@10.1.2.71) - Bucket "default" loaded on node 'ns_1@10.1.2.71' in 0 seconds.
2012-02-29 19:35:04.562 ns_memcached:1:info:message(ns_1@10.1.2.72) - Bucket "default" loaded on node 'ns_1@10.1.2.72' in 0 seconds.
2012-02-29 19:35:06.031 ns_port_server:0:info:message(ns_1@10.1.2.71) - Port server memcached on node 'ns_1@10.1.2.71' exited with status 255. Restarting. Messages: Trying to connect to mccouch: "localhost:11213"
Connected to mccouch: "localhost:11213"
Trying to connect to mccouch: "localhost:11213"
Connected to mccouch: "localhost:11213"
Extension support isn't implemented in this version of bucket_engine
Preloaded zu keys (with metadata)
The second phase of warmup took 6316 (us).
2012-02-29 19:35:06.718 ns_memcached:4:info:message(ns_1@10.1.2.71) - Control connection to memcached on 'ns_1@10.1.2.71' disconnected: {{badmatch,
                                                                    {error,
                                                                     closed}},
                                                                   [{mc_client_binary,
                                                                     cmd_binary_vocal,
                                                                     6},
                                                                    {mc_client_binary,
                                                                     stats,4},
                                                                    {ns_memcached,
                                                                     do_handle_call,
                                                                     3},
                                                                    {ns_memcached,
                                                                     handle_call,
                                                                     3},
                                                                    {gen_server,
                                                                     handle_msg,
                                                                     5},
                                                                    {proc_lib,
                                                                     init_p_do_apply,
                                                                     3}]}