fdb crash in 2i system test

Seeing fdb crash in 2i system test. Build 2566.

Logs, fdb file, mini-dump are under /root/fdb-crash-2566 at 172.23.105.60

2016-05-17T10:47:57.983-07:00 [Info] TK StreamEnd MAINT_STREAM ORDER_LINE 642 266622499218054 211
[FDB ERR] Read error: read offset 281483568750592 exceeds the file's current offset 23486464 in a database file '/data/@2i/default_default_rating_6556927569030951706_0.index/data.fdb.0'

[FDB ERR] Error in reading a doc block with id 68721574402 from a database file '/data/@2i/default_default_rating_6556927569030951706_0.index/data.fdb.0'
[FDB ERR] Error in reading a doc length from offset 281483568750758 in block id 68721574402 from a database file '/data/@2i/default_default_rating_6556927569030951706_0.index/data.fdb.0'
[FDB ERR] Error in reading the doc length metadata with offset 281483568750758 from a database file '/data/@2i/default_default_rating_6556927569030951706_0.index/data.fdb.0'
[FDB ERR] docio_read_doc_key error: read failure on offset 281483568750758 in a database file '/data/@2i/default_default_rating_6556927569030951706_0.index/data.fdb.0' : FDB status -5, lastbid 0xffffffffffffffff, curblock 0xffffffffffffffff, curpos 0x0

(hex) 0x7f66ce1c2000, 4096 (0x1000) bytes
0000 00 28 00 00 00 00 00 00 00 00 00 00 04 Breakpad caught a crash in forestdb. Writing crash dump to /opt/couchbase/var/lib/couchbase/crash/5c0440ee-b13c-7127-0de51b9b-2b780bb8.dmp before terminating.
00 00 00 00 57 66 4d -33_774.37 ....(hex) 0x7f66cfb4f000, 4096 (0x1000) bytes