[system tests] cbq-engine terminated: exit status 2 , panic: runtime error

1. Load 10M data on bucket default
2. Wait for indexing to complete

3. cbq-engine exits with status 2, seeing following stack on query.log

2015-04-14T15:19:09.336Z-07:00 [Warn] servicesChangeNotifier: Consumer for http://%40:d6950d66d6ff4b61a7bf45d72d032dad@127.0.0.1:8091 took too long to read notification, making the consumer invalid
panic: runtime error: send on closed channel

goroutine 655 [running]:
runtime.panic(0xd92160, 0x16fa289)
/usr/local/go/src/pkg/runtime/panic.c:279 +0xf5
github.com/couchbase/indexing/secondary/common.func·002(0xd8c200, 0xc21e5046c0, 0x0, 0x0)
/home/couchbase/jenkins/workspace/sherlock-unix/goproj/src/github.com/couchbase/indexing/secondary/common/services_notifier.go:60 +0x35d
github.com/couchbase/indexing/secondary/dcp.(*Client).runObserveStreamingEndpoint(0xc209202eb0, 0xc208e40ce0, 0x17, 0x10caa40, 0xc208e40cc0, 0x0, 0x0, 0x0)
/home/couchbase/jenkins/workspace/sherlock-unix/goproj/src/github.com/couchbase/indexing/secondary/dcp/pools.go:372 +0x787
github.com/couchbase/indexing/secondary/dcp.(*Client).RunObservePool(0xc209202eb0, 0xea51d0, 0x7, 0xc208e40cc0, 0x0, 0x0, 0x0)
/home/couchbase/jenkins/workspace/sherlock-unix/goproj/src/github.com/couchbase/indexing/secondary/dcp/pools.go:298 +0xaf
github.com/couchbase/indexing/secondary/common.(*serviceNotifierInstance).RunPoolObserver(0xc209202e70)
/home/couchbase/jenkins/workspace/sherlock-unix/goproj/src/github.com/couchbase/indexing/secondary/common/services_notifier.go:75 +0x8c
created by github.com/couchbase/indexing/secondary/common.NewServicesChangeNotifier
/home/couchbase/jenkins/workspace/sherlock-unix/goproj/src/github.com/couchbase/indexing/secondary/common/services_notifier.go:145 +0x417

goroutine 16 [chan receive, 47 minutes]:
main.signalCatcher(0xc208086000, 0xc208086090, 0x0, 0x0)

attaching detailed stack and logs.