LRU data container endlesly looping or exhibiting heavy contention

Something around LRU container is not working fine. The attached log from an concurrency test in the 2nd level cache shows that in 3 thread dumps taken over 30 seconds appart, UserRunnerThread-5 is stuck in:

"UserRunnerThread-5" prio=10 tid=0x6f65bc00 nid=0xdea runnable [0x05efb000]
java.lang.Thread.State: RUNNABLE
at org.infinispan.container.FIFODataContainer$LinkedEntry.casNext(FIFODataContainer.java:180)
at org.infinispan.container.FIFODataContainer.correctPrev(FIFODataContainer.java:329)
at org.infinispan.container.FIFODataContainer.linkAtEnd(FIFODataContainer.java:252)
at org.infinispan.container.LRUDataContainer.put(LRUDataContainer.java:70)
at org.infinispan.container.entries.ReadCommittedEntry.commit(ReadCommittedEntry.java:161)
at org.infinispan.interceptors.LockingInterceptor.commitEntry(LockingInterceptor.java:298)
at org.infinispan.interceptors.LockingInterceptor.cleanupLocks(LockingInterceptor.java:281)
at org.infinispan.interceptors.LockingInterceptor.doAfterCall(LockingInterceptor.java:243)
at org.infinispan.interceptors.LockingInterceptor.visitPutKeyValueCommand(LockingInterceptor.java:200)
at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76)
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:132)
at org.infinispan.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:57)
at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76)
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
at org.infinispan.interceptors.MarshalledValueInterceptor.visitPutKeyValueCommand(MarshalledValueInterceptor.java:93)
at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76)
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
at org.infinispan.interceptors.TxInterceptor.enlistWriteAndInvokeNext(TxInterceptor.java:185)
at org.infinispan.interceptors.TxInterceptor.visitPutKeyValueCommand(TxInterceptor.java:132)
at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76)
at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:48)
at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:34)
at org.infinispan.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:57)
at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76)
at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:269)
at org.infinispan.CacheDelegate.putIfAbsent(CacheDelegate.java:422)
at org.infinispan.CacheDelegate.putIfAbsent(CacheDelegate.java:153)
at org.infinispan.CacheDelegate.putForExternalRead(CacheDelegate.java:243)
at org.hibernate.cache.infinispan.util.CacheAdapterImpl.putForExternalRead(CacheAdapterImpl.java:115)
at org.hibernate.cache.infinispan.access.TransactionalAccessDelegate.putFromLoad(TransactionalAccessDelegate.java:91)
at org.hibernate.cache.infinispan.collection.TransactionalAccess.putFromLoad(TransactionalAccess.java:44)
at org.hibernate.engine.loading.CollectionLoadContext.addCollectionToCache(CollectionLoadContext.java:333)
at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:279)
at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:245)
at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:218)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:901)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:886)
at org.hibernate.loader.Loader.doQuery(Loader.java:750)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:257)
at org.hibernate.loader.Loader.loadCollection(Loader.java:2019)
at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:62)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:628)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1817)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:366)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108)
at org.hibernate.collection.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:131)
at org.hibernate.collection.PersistentSet.isEmpty(PersistentSet.java:169)
at org.hibernate.test.cache.infinispan.functional.ConcurrentWriteTest.getFirstContact(ConcurrentWriteTest.java:405)
at org.hibernate.test.cache.infinispan.functional.ConcurrentWriteTest.access$0(ConcurrentWriteTest.java:397)
at org.hibernate.test.cache.infinispan.functional.ConcurrentWriteTest$UserRunner.contactExists(ConcurrentWriteTest.java:519)
at org.hibernate.test.cache.infinispan.functional.ConcurrentWriteTest$UserRunner.call(ConcurrentWriteTest.java:540)
at org.hibernate.test.cache.infinispan.functional.ConcurrentWriteTest$UserRunner.call(ConcurrentWriteTest.java:1)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)

This concurrency test does not get to finish in over a minute. However, once LRU is switched to NONE or FIFO, the test runs in 5 seconds.
So, something looks fishy with LRU.