We are trying to deploy juju HA on customer site.
With same scenario,
$ juju bootstrap
$ juju ensure-availability
Then kill mongo on machine 0 (master state server).
Juju stop working. (juju status not respond.) We think this is a bug for HA.

===== juju log ============
ubuntu@maas-trusty:~$ juju status --debug
2014-10-19 17:42:14 INFO juju.cmd supercommand.go:37 running juju [1.20.8-trusty-amd64 gc]
2014-10-19 17:42:14 DEBUG juju.conn api.go:187 trying cached API connection settings
2014-10-19 17:42:14 INFO juju.conn api.go:270 connecting to API addresses: [bootstrap-trusty-01.beijing.cts.canonical.com:17070 bootstrap-trusty-01.beijing.cts.canonical.com:17070 10.231.64.39:17070 bootstrap-trusty-02.beijing.cts.canonical.com:17070 bootstrap-trusty-02.beijing.cts.canonical.com:17070 10.231.64.87:17070 bootstrap-trusty-03.beijing.cts.canonical.com:17070 bootstrap-trusty-03.beijing.cts.canonical.com:17070 10.231.64.88:17070]
2014-10-19 17:42:14 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-01.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:14 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-01.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:14 INFO juju.state.api apiclient.go:242 dialing "wss://10.231.64.39:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:14 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-02.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:14 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-02.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:14 INFO juju.state.api apiclient.go:242 dialing "wss://10.231.64.87:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:14 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:14 DEBUG juju.state.api apiclient.go:248 error dialing "wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api", will retry: websocket.Dial wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api: dial tcp 10.231.64.88:17070: connection refused
2014-10-19 17:42:14 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:14 DEBUG juju.state.api apiclient.go:248 error dialing "wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api", will retry: websocket.Dial wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api: dial tcp 10.231.64.88:17070: connection refused
2014-10-19 17:42:14 INFO juju.state.api apiclient.go:242 dialing "wss://10.231.64.88:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:14 DEBUG juju.state.api apiclient.go:248 error dialing "wss://10.231.64.88:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api", will retry: websocket.Dial wss://10.231.64.88:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api: dial tcp 10.231.64.88:17070: connection refused
2014-10-19 17:42:16 DEBUG juju.provider.maas environprovider.go:30 opening environment "maas".
2014-10-19 17:42:16 DEBUG juju.provider.common state.go:83 waiting for addresses of state server instances [/MAAS/api/1.0/nodes/node-cf194ab4-072b-11e4-beb5-00163e0f4f3c/]
2014-10-19 17:42:16 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-01.beijing.cts.canonical.com:17070/"
2014-10-19 17:42:16 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-01.beijing.cts.canonical.com:17070/"
2014-10-19 17:42:16 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"
2014-10-19 17:42:16 DEBUG juju.state.api apiclient.go:248 error dialing "wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api", will retry: websocket.Dial wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api: dial tcp 10.231.64.88:17070: connection refused
2014-10-19 17:42:16 INFO juju.state.api apiclient.go:242 dialing "wss://10.231.64.39:17070/"
2014-10-19 17:42:16 INFO juju.state.api apiclient.go:242 dialing "wss://bootstrap-trusty-03.beijing.cts.canonical.com:17070/environment/cf1c570b-0611-4585-8915-fc3fb53024d1/api"