ShareableNodesTest.testAddShareableMixin failures

java.lang.IllegalStateException: Change processor already stopped
	at com.google.common.base.Preconditions.checkState(Preconditions.java:150)
	at org.apache.jackrabbit.oak.jcr.observation.ChangeProcessor$RunningGuard.stop(ChangeProcessor.java:259)
	at org.apache.jackrabbit.oak.jcr.observation.ChangeProcessor.stop(ChangeProcessor.java:192)
	at org.apache.jackrabbit.oak.jcr.observation.ObservationManagerImpl.stop(ObservationManagerImpl.java:267)
	at org.apache.jackrabbit.oak.jcr.observation.ObservationManagerImpl.dispose(ObservationManagerImpl.java:117)
	at org.apache.jackrabbit.oak.jcr.session.SessionContext.dispose(SessionContext.java:387)
	at org.apache.jackrabbit.oak.jcr.session.SessionImpl$10.perform(SessionImpl.java:465)
	at org.apache.jackrabbit.oak.jcr.session.SessionImpl$10.perform(SessionImpl.java:462)
	at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.perform(SessionDelegate.java:263)
	at org.apache.jackrabbit.oak.jcr.delegate.SessionDelegate.safePerform(SessionDelegate.java:306)
	at org.apache.jackrabbit.oak.jcr.session.SessionImpl.safePerform(SessionImpl.java:129)
	at org.apache.jackrabbit.oak.jcr.session.SessionImpl.logout(SessionImpl.java:462)
	at org.apache.jackrabbit.test.AbstractJCRTest.cleanUp(AbstractJCRTest.java:439)
	at org.apache.jackrabbit.test.AbstractJCRTest.tearDown(AbstractJCRTest.java:448)
	at org.apache.jackrabbit.test.api.observation.AbstractObservationTest.tearDown(AbstractObservationTest.java:67)
	at junit.framework.TestCase.runBare(TestCase.java:140)
	at junit.framework.TestResult$1.protect(TestResult.java:110)
	at junit.framework.TestResult.runProtected(TestResult.java:128)
	at junit.framework.TestResult.run(TestResult.java:113)
	at junit.framework.TestCase.run(TestCase.java:124)
	at org.apache.jackrabbit.test.AbstractJCRTest.run(AbstractJCRTest.java:464)
	at junit.framework.TestSuite.runTest(TestSuite.java:243)
	at junit.framework.TestSuite.run(TestSuite.java:238)
	at junit.framework.TestSuite.runTest(TestSuite.java:243)
	at org.apache.jackrabbit.test.ConcurrentTestSuite.access$001(ConcurrentTestSuite.java:29)
	at org.apache.jackrabbit.test.ConcurrentTestSuite$2.run(ConcurrentTestSuite.java:67)
	at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:662)