"inconsistent_state" in query result after rebalance

Running about 300 queries/sec against 2 buckets

• Started rebalance
• Rebalance fails with error in vbucket_mover
  ...
  <0.7975.178> exited with {unexpected_exit,
  {'EXIT',<0.8005.178>,
  {{badmatch,
  [{'EXIT',
  {timeout, {gen_server,call, [<15200.2771.3094>,had_backfill,30000]}

  }}]},
  [

  {ns_single_vbucket_mover, '-wait_backfill_determination/1-fun-1-',1}

  ]}}}

• during rebalance I see a lot of these errors:

Stacktrace: [

{couch_view_merger,simple_set_view_query,3}

,

{couch_httpd,handle_request,6}

,

{mochiweb_http,headers,5}

,

{proc_lib,init_p_do_apply,3}

]
[couchdb:error,2012-10-16T8:43:02.960,ns_1@10.6.2.66:<0.4247.177>:couch_log:error:42]Uncaught error in HTTP request: {throw,{error,set_view_outdated}}

• Manual queries throws inconsistent state and looks like it's pointing to missing partition [6]:
  http://10.6.2.68:8092/default/_design/d1/_view/v1?connection_timeout=60000&limit=10&skip=0

{"error":"error","reason":"inconsistent_state"}

[couchdb:info,2012-10-16T15:59:14.035,ns_1@10.6.2.66:<0.3334.193>:couch_log:info:39]Set view `default`, group `_design/d1`, missing partitions: [6]
[couchdb:error,2012-10-16T15:59:19.043,ns_1@10.6.2.66:<0.7960.182>:couch_log:error:42]Uncaught error in HTTP request: {throw,{error,inconsistent_state}}

• cbstats shows that partition [6] is neither active nor replica on10.6.2.66,

[root@pine-11802 logs]# /opt/couchbase/bin/cbstats localhost:11210 vbucket -b saslbucket -p password | grep vb_6:
[root@pine-11802 logs]#

*however the file exists in its data directory (could be we failed to move?)
/opt/couchbase/bin/couch_dbinfo /data/default/6.couch.12
DB Info (/data/default/6.couch.12)
file format version: 10
update_seq: 20614
doc count: 13566
deleted doc count: 112
data size: 13.16 MB
B-tree size: 1.25 MB
total disk size: 18.18 MB

*indexer doesn't expect this db to be here either
curl -s -u Administrator:password 'http://10.6.2.66:8092/_set_view/default/_design/d1/_info' | json_xs
"active_partitions" : [
0,
1,
2,
3,
4,
5,
7,
8,
9,

(full logs to be attached)