[CBSE] Analyse possible hang in forestdb code

1 @ 0x4091d0 0x4ccd9d 0x4cd21b 0xdd644a 0xdda267 0xde0cf1 0xdcb0f0 0xdc948e 0xdc90b1 0xdc8b8b 0xdc8355 0x465a11

#       0x4ccd9c        github.com/couchbase/indexing/secondary/fdb._Cfunc_fdb_snapshot_open+0x4c       ??:0

#       0x4cd21a        github.com/couchbase/indexing/secondary/fdb.(*KVStore).SnapshotOpen+0x2fa       goproj/src/github.com/couchbase/indexing/secondary/fdb/commit.go:24

#       0xdd6449        github.com/couchbase/gometa/repository.(*Repository).CreateSnapshot+0x169       goproj/src/github.com/couchbase/gometa/repository/repo.go:180

#       0xdda266        github.com/couchbase/gometa/repository.(*TransientCommitLog).MarkCommitted+0x76 goproj/src/github.com/couchbase/gometa/repository/transient_commit_log.go:118

#       0xde0cf0        github.com/couchbase/gometa/action.(*ServerAction).Commit+0xf0                  goproj/src/github.com/couchbase/gometa/action/action.go:173

#       0xdcb0ef        github.com/couchbase/gometa/protocol.(*Leader).commit+0xbf                      goproj/src/github.com/couchbase/gometa/protocol/leader.go:956

#       0xdc948d        github.com/couchbase/gometa/protocol.(*Leader).newProposal+0x33d                goproj/src/github.com/couchbase/gometa/protocol/leader.go:725

#       0xdc90b0        github.com/couchbase/gometa/protocol.(*Leader).createProposal+0x300             goproj/src/github.com/couchbase/gometa/protocol/leader.go:683

#       0xdc8b8a        github.com/couchbase/gometa/protocol.(*Leader).handleMessage+0x28a              goproj/src/github.com/couchbase/gometa/protocol/leader.go:645

#       0xdc8354        github.com/couchbase/gometa/protocol.(*Leader).listen+0x134                     goproj/src/github.com/couchbase/gometa/protocol/leader.go:559