Possible ConcurrentModificationException on Redis based ClusterInvalidator

ben : tu vois comment c'est possible ça:
Caused by: javax.resource.ResourceException: Unknown throwable when trying to enlist connection in tx
        at org.apache.geronimo.connector.outbound.TransactionEnlistingInterceptor.getConnection(TransactionEnlistingInterceptor.java:75)
        at org.apache.geronimo.connector.outbound.TransactionCachingInterceptor.getConnection(TransactionCachingInterceptor.java:101)
        at org.apache.geronimo.connector.outbound.ConnectionHandleInterceptor.getConnection(ConnectionHandleInterceptor.java:43)
        at org.apache.geronimo.connector.outbound.TCCLInterceptor.getConnection(TCCLInterceptor.java:39)
        at org.apache.geronimo.connector.outbound.ConnectionTrackingInterceptor.getConnection(ConnectionTrackingInterceptor.java:66)
        at org.apache.geronimo.connector.outbound.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:77)
        at org.nuxeo.runtime.jtajca.NuxeoContainer$ConnectionManagerWrapper.allocateConnection(NuxeoContainer.java:837)
        at org.nuxeo.ecm.core.storage.sql.ra.ConnectionFactoryImpl.getConnection(ConnectionFactoryImpl.java:98)
        ... 22 more
Caused by: java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
        at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
        at java.util.AbstractCollection.addAll(AbstractCollection.java:343)
        at org.nuxeo.ecm.core.storage.sql.Invalidations.add(Invalidations.java:119)
        at org.nuxeo.ecm.core.storage.sql.InvalidationsQueue.addInvalidations(InvalidationsQueue.java:37)
        at org.nuxeo.ecm.core.storage.sql.InvalidationsPropagator.propagateInvalidations(InvalidationsPropagator.java:46)
        at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCRowMapper.receiveInvalidations(JDBCRowMapper.java:92)
        at sun.reflect.GeneratedMethodAccessor54.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCMapperConnector.doInvoke(JDBCMapperConnector.java:22)
        at org.nuxeo.ecm.core.storage.sql.jdbc.JDBCMapperConnector.invoke(JDBCMapperConnector.java:55)
        at com.sun.proxy.$Proxy49.receiveInvalidations(Unknown Source)
        at org.nuxeo.ecm.core.storage.sql.SoftRefCachingRowMapper.receiveInvalidations(SoftRefCachingRowMapper.java:210)
        at org.nuxeo.ecm.core.storage.sql.PersistenceContext.processReceivedInvalidations(PersistenceContext.java:470)
        at org.nuxeo.ecm.core.storage.sql.SessionImpl.processReceivedInvalidations(SessionImpl.java:571)
        at org.nuxeo.ecm.core.storage.sql.SessionImpl.start(SessionImpl.java:1309)