Occurences of "Exception acquiring ownership of X (via SharedLocalYieldingClusterLockManager)"

13:09:28,290 WARN  [org.apache.catalina.session.ManagerBase] (ContainerBackgroundProcessor[StandardEngine[jboss.web]]) JBAS018080: Standard expiration of session qLQps+CQJxEi6pJTBSzis0g3 failed; switching to a brute force cleanup. Problem is JBAS018060: Exception acquiring ownership of qLQps+CQJxEi6pJTBSzis0g3

12:55:49,556 INFO  [org.jboss.as.clustering.impl.CoreGroupCommunicationService.ejb] (Incoming-2,null) JBAS010248: New cluster view for partition ejb: 6 (org.jboss.as.clustering.impl.CoreGroupCommunicationService$GroupView@327579f6 delta: -1, merge: false)
12:55:49,557 INFO  [org.infinispan.remoting.transport.jgroups.JGroupsTransport] (Incoming-2,null) ISPN000094: Received new cluster view: [perf21/ejb|6] [perf21/ejb, perf20/ejb, perf18/ejb]
12:56:31,694 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host]] (ajp-perf20-10.16.90.58-8009-211) Exception sending request initialized lifecycle event to listener instance of class org.jboss.weld.servlet.WeldListener: java.lang.RuntimeException: JBAS018060: Exception acquiring ownership of MvwC8KGWTuKPjD1-JjLW7URZ
	at org.jboss.as.web.session.ClusteredSession.acquireSessionOwnership(ClusteredSession.java:528) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
	at org.jboss.as.web.session.ClusteredSession.expire(ClusteredSession.java:1260) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
	at org.jboss.as.web.session.ClusteredSession.isValid(ClusteredSession.java:1208) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
	at org.jboss.as.web.session.ClusteredSession.isValid(ClusteredSession.java:598) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
	at org.jboss.as.web.session.DistributableSessionManager.add(DistributableSessionManager.java:917) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
	at org.jboss.as.web.session.DistributableSessionManager.loadSession(DistributableSessionManager.java:1407) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
	at org.jboss.as.web.session.DistributableSessionManager.findSession(DistributableSessionManager.java:686) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
	at org.jboss.as.web.session.DistributableSessionManager.findSession(DistributableSessionManager.java:85) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
	at org.apache.catalina.connector.Request.doGetSession(Request.java:2618) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.connector.Request.getSession(Request.java:2375) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:841) [jbossweb-7.0.13.Final.jar:]
	at org.jboss.weld.context.beanstore.http.LazySessionBeanStore.getSession(LazySessionBeanStore.java:72) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
	at org.jboss.weld.context.beanstore.http.LazySessionBeanStore.<init>(LazySessionBeanStore.java:58) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
	at org.jboss.weld.context.http.HttpSessionContextImpl.associate(HttpSessionContextImpl.java:31) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
	at org.jboss.weld.context.http.HttpSessionContextImpl.associate(HttpSessionContextImpl.java:16) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
	at org.jboss.weld.servlet.WeldListener.requestInitialized(WeldListener.java:134) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:]
	at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:505) [jbossweb-7.0.13.Final.jar:]
	at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:445) [jbossweb-7.0.13.Final.jar:]
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:]
	at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_30]
Caused by: org.jboss.as.clustering.lock.TimeoutException: JBAS010223: Cannot acquire lock //default-host//clusterbench/MvwC8KGWTuKPjD1-JjLW7URZ from cluster
	at org.jboss.as.clustering.lock.SharedLocalYieldingClusterLockManager.lock(SharedLocalYieldingClusterLockManager.java:439)
	at org.jboss.as.clustering.web.infinispan.DistributedCacheManager.acquireSessionOwnership(DistributedCacheManager.java:372)
	at org.jboss.as.web.session.ClusteredSession.acquireSessionOwnership(ClusteredSession.java:520) [jboss-as-web-7.1.2.Final-SNAPSHOT.jar:7.1.2.Final-SNAPSHOT]
	... 23 more