Deadlock in Map/Reduce tasks

16:18:40,649 ERROR (testng-DistributedFourNodesMapReduceTest:) [UnitTestTestNGListener] Test testCombinerDoesNotChangeResult(org.infinispan.distexec.mapreduce.DistributedFourNodesMapReduceTest) failed.
org.infinispan.CacheException: Could not invoke map phase of MapReduce task on remote nodes 
	at org.infinispan.distexec.mapreduce.MapReduceTask.invokeEverywhere(MapReduceTask.java:562)
	at org.infinispan.distexec.mapreduce.MapReduceTask.executeMapPhase(MapReduceTask.java:374)
	at org.infinispan.distexec.mapreduce.MapReduceTask.execute(MapReduceTask.java:315)
	at org.infinispan.distexec.mapreduce.BaseWordCountMapReduceTest.testCombinerDoesNotChangeResult(BaseWordCountMapReduceTest.java:188)
...
Caused by: org.infinispan.CacheException: org.infinispan.CacheException: Could not move intermediate keys/values for M/R task 04244b4b-08b1-4fc4-9755-ed02f3f35a3a
	at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.mapAndCombineForDistributedReduction(MapReduceManagerImpl.java:97)
	at org.infinispan.commands.read.MapCombineCommand.perform(MapCombineCommand.java:89)
	at org.infinispan.remoting.InboundInvocationHandlerImpl.handleInternal(InboundInvocationHandlerImpl.java:95)
	at org.infinispan.remoting.InboundInvocationHandlerImpl.handleWithWaitForBlocks(InboundInvocationHandlerImpl.java:110)
	at org.infinispan.remoting.InboundInvocationHandlerImpl.handle(InboundInvocationHandlerImpl.java:82)
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.executeCommandFromLocalCluster(CommandAwareRpcDispatcher.java:244)
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.handle(CommandAwareRpcDispatcher.java:217)
	at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:483)
...
Caused by: org.infinispan.CacheException: Could not move intermediate keys/values for M/R task 04244b4b-08b1-4fc4-9755-ed02f3f35a3a
	at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.combine(MapReduceManagerImpl.java:281)
	at org.infinispan.distexec.mapreduce.MapReduceManagerImpl.mapAndCombineForDistributedReduction(MapReduceManagerImpl.java:95)
	... 26 more
Caused by: org.infinispan.util.concurrent.TimeoutException: Unable to acquire lock after [10 seconds] on key [JBoss] for requestor [GlobalTransaction:<NodeD-56763>:10429:remote]! Lock held by [GlobalTransaction:<NodeB-55590>:10432:remote]
	at org.infinispan.util.concurrent.locks.LockManagerImpl.lock(LockManagerImpl.java:217)
	at org.infinispan.util.concurrent.locks.LockManagerImpl.acquireLock(LockManagerImpl.java:190)
	at org.infinispan.interceptors.locking.AbstractTxLockingInterceptor.lockKeyAndCheckOwnership(AbstractTxLockingInterceptor.java:190)
	at org.infinispan.interceptors.locking.AbstractTxLockingInterceptor.lockAndRegisterBackupLock(AbstractTxLockingInterceptor.java:125)
	at org.infinispan.interceptors.locking.PessimisticLockingInterceptor.visitLockControlCommand(PessimisticLockingInterceptor.java:248)
	at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:131)
	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.visitLockControlCommand(AbstractVisitor.java:177)
	at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:131)
	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
	at org.infinispan.interceptors.TxInterceptor.invokeNextInterceptorAndVerifyTransaction(TxInterceptor.java:125)
	at org.infinispan.interceptors.TxInterceptor.visitLockControlCommand(TxInterceptor.java:174)
	at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:131)
	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
	at org.infinispan.statetransfer.StateTransferInterceptor.handleTopologyAffectedCommand(StateTransferInterceptor.java:212)
	at org.infinispan.statetransfer.StateTransferInterceptor.handleTxCommand(StateTransferInterceptor.java:187)
	at org.infinispan.statetransfer.StateTransferInterceptor.visitLockControlCommand(StateTransferInterceptor.java:131)
	at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:131)
	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:118)
	at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:129)
	at org.infinispan.interceptors.InvocationContextInterceptor.visitLockControlCommand(InvocationContextInterceptor.java:98)
	at org.infinispan.commands.control.LockControlCommand.acceptVisitor(LockControlCommand.java:131)
	at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:347)
	at org.infinispan.commands.control.LockControlCommand.perform(LockControlCommand.java:150)
	at org.infinispan.remoting.InboundInvocationHandlerImpl.handleInternal(InboundInvocationHandlerImpl.java:95)
	at org.infinispan.remoting.InboundInvocationHandlerImpl.handleWithWaitForBlocks(InboundInvocationHandlerImpl.java:110)
	at org.infinispan.remoting.InboundInvocationHandlerImpl.handle(InboundInvocationHandlerImpl.java:82)
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.executeCommandFromLocalCluster(CommandAwareRpcDispatcher.java:244)
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.handle(CommandAwareRpcDispatcher.java:217)
	at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:483)
...