Exception occurred after Disassociate the L3VPN from the router, Traffic was not flowing across VM after the exception. Exception occurred in the sandbox environment during script

execution.netvirt/vpnservice/vpn_basic_dualstack_subnet_routing.robot. 

Queens OpenStack

Fluorine master build(from 26-sep-2018 to till date)

Attached Logs for more details.

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New exceptions found: 4 [{'warnerr_list': [21, 22, 23], 'lines': [u'2018-10-03T09:32:46,111 | WARN | opendaylight-cluster-data-akka.actor.default-dispatcher-52 | LocalThreePhaseCommitCohort | 236 - org.opendaylight.controller.sal-distributed-datastore - 1.9.0.SNAPSHOT | Failed to prepare transaction member-1-datastore-operational-fe-0-txn-6578-0 on backend', u'org.opendaylight.mdsal.common.api.OptimisticLockFailedException: Optimistic lock failed for path /(urn:opendaylight:genius:alivenessmonitor?revision=2016-04-11)interface-monitor-map/interface-monitor-entry/interface-monitor-entry[

]', u'\tat org.opendaylight.controller.cluster.datastore.ShardDataTree.lambda$processNextPendingTransaction$0(ShardDataTree.java:733) ~[236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat org.opendaylight.controller.cluster.datastore.ShardDataTree.processNextPending(ShardDataTree.java:771) [236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat org.opendaylight.controller.cluster.datastore.ShardDataTree.processNextPendingTransaction(ShardDataTree.java:718) [236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat org.opendaylight.controller.cluster.datastore.ShardDataTree.startCanCommit(ShardDataTree.java:872) [236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat org.opendaylight.controller.cluster.datastore.SimpleShardDataTreeCohort.canCommit(SimpleShardDataTreeCohort.java:99) [236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat org.opendaylight.controller.cluster.datastore.CohortEntry.canCommit(CohortEntry.java:99) [236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator.handleCanCommit(ShardCommitCoordinator.java:238) [236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat org.opendaylight.controller.cluster.datastore.ShardCommitCoordinator.handleReadyLocalTransaction(ShardCommitCoordinator.java:200) [236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat org.opendaylight.controller.cluster.datastore.Shard.handleReadyLocalTransaction(Shard.java:729) [236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat org.opendaylight.controller.cluster.datastore.Shard.handleNonRaftCommand(Shard.java:330) [236:org.opendaylight.controller.sal-distributed-datastore:1.9.0.SNAPSHOT]', u'\tat 

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New exceptions found: 1 [{'warnerr_list': [592, 657, 658, 663, 664], 'lines': [u'2018-10-03T12:54:08,911 | ERROR | org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.fibmanager.rev150330.vrfentries.VrfEntry_AsyncDataTreeChangeListenerBase-DataTreeChangeHandler-0 | AsyncDataTreeChangeListenerBase | 262 - org.opendaylight.genius.mdsalutil-api - 0.6.0.SNAPSHOT | Thread terminated due to uncaught exception: org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.fibmanager.rev150330.vrfentries.VrfEntry_AsyncDataTreeChangeListenerBase-DataTreeChangeHandler-0', u'java.lang.NullPointerException: Vpn Instance not available 2506:2', u'\tat com.google.common.base.Preconditions.checkNotNull(Preconditions.java:900) [32:com.google.guava:23.6.1.jre]', u'\tat org.opendaylight.netvirt.fibmanager.RouterInterfaceVrfEntryHandler.installRouterFibEntries(RouterInterfaceVrfEntryHandler.java:75) [343:org.opendaylight.netvirt.fibmanager-impl:0.8.0.SNAPSHOT]', u'\tat org.opendaylight.netvirt.fibmanager.RouterInterfaceVrfEntryHandler.removeFlows(RouterInterfaceVrfEntryHandler.java:69) [343:org.opendaylight.netvirt.fibmanager-impl:0.8.0.SNAPSHOT]', u'\tat org.opendaylight.netvirt.fibmanager.VrfEntryListener.removeFibEntries(VrfEntryListener.java:270) [343:org.opendaylight.netvirt.fibmanager-impl:0.8.0.SNAPSHOT]', u'\tat org.opendaylight.netvirt.fibmanager.VrfEntryListener.remove(VrfEntryListener.java:251) [343:org.opendaylight.netvirt.fibmanager-impl:0.8.0.SNAPSHOT]', u'\tat org.opendaylight.netvirt.fibmanager.VrfEntryListener.remove(VrfEntryListener.java:120) [343:org.opendaylight.netvirt.fibmanager-impl:0.8.0.SNAPSHOT]', u'\tat org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase$DataTreeChangeHandler.run(AsyncDataTreeChangeListenerBase.java:158) [262:org.opendaylight.genius.mdsalutil-api:0.6.0.SNAPSHOT]', u'\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]', u'\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]', u'\tat java.lang.Thread.run(Thread.java:748) [?:?]']}]