Step to reproduce the error:

install
log:set TRACE org.opendaylight.bgpcep
log:set TRACE org.opendaylight.protocol
feature:install odl-bgpcep-bgp-all
feature:install odl-restconf-noauth

then logout from karaf.

It will result Error on any closed method in which we try
to delete from DS.

2015-09-29 14:08:01,866 | ERROR | Bundle Shutdown | SnapshotBackedWriteTransaction | 179 - org.opendaylight.controller.sal-core-spi - 1.2.2.SNAPSHOT | Tx: member-1-txn-3, failed to delete /(urn:opendaylight:params:xml:ns:yang:programming?revision=2013-09-30)instructions-
queue in MutableDataTree [modification=NodeModification [identifier=(urn:ietf:params:xml:ns:netconf:base:1.0)data, modificationType=NONE, childModification={}]]

2015-09-29 14:08:01,951 | ERROR | Bundle Shutdown | AbstractMXBean | 176 - org.opendaylight.controller.sal-common-util - 1.2.2.SNAPSHOT | Failed when unregistering MBean {}
javax.management.InstanceNotFoundException: org.opendaylight.controller:type=DOMDataBroker,name=CommitStats

....
2015-09-29 14:08:01,955 | ERROR | Bundle Shutdown | AbstractMXBean | 176 - org.opendaylight.controller.sal-common-util - 1.2.2.SNAPSHOT | Failed when unregistering MBean {}
javax.management.InstanceNotFoundException: org.opendaylight.controller:type=DOMDataBroker,name=CommitFutureExecutorStats