4.6.3 System Test : Rebalance failure when taking out failed over nodes

Build : 4.6.3-4084

The following step in the integration system test failed on the 4th day. It had succeeded previously.

[2017-07-29T19:54:25-04:00, sequoiatools/couchbase-cli:5f05a9] server-add -c 172.23.106.14:8091 --server-add 172.23.106.213:8091 -u Administrator -p password --server-add-username Administrator --server-add-password password
[2017-07-29T19:54:38-04:00, sequoiatools/couchbase-cli:1a3f1f] failover -c 172.23.106.14:8091 --server-failover 172.23.105.83:8091 -u Administrator -p password
[2017-07-29T20:02:57-04:00, sequoiatools/couchbase-cli:1b6379] failover -c 172.23.106.14:8091 --server-failover 172.23.105.63:8091 -u Administrator -p password --force
[2017-07-29T20:03:09-04:00, sequoiatools/couchbase-cli:5ad0df] rebalance -c 172.23.106.14:8091 -u Administrator -p password
→

Error occurred on container, try:
docker logs 5ad0df
docker start 5ad0df

The following error can be seen in the info.log for the same activity :
Rebalance exited with reason {unexpected_exit,
{'EXIT',<0.26743.1475>,
{{error,
{badrpc,
{'EXIT',
{{error,
<<"Partition 257 not in active nor passive set">>},
{gen_server,call,
['capi_set_view_manager-default',

{wait_index_updated,257}

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

{'janitor_agent-default', 'ns_1@172.23.106.213'}

,
{if_rebalance,<0.8465.1474>,
{dcp_takeover,'ns_1@172.23.99.168',376}},
infinity]}}}}

Test console : http://qa.sc.couchbase.com/job/ubuntu-systest-launcher/372/console

Logs :
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.105.60.zip
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.105.61.zip
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.105.62.zip
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.105.63.zip
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.105.83.zip
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.106.14.zip
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.106.213.zip
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.106.96.zip
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.99.168.zip
https://s3.amazonaws.com/bugdb/MB-25481/collectinfo-2017-07-30T050352-ns_1%40172.23.99.253.zip