Deadlock with kcontainer.updateToVersion() under load

Found one Java-level deadlock:
=============================
"pool-8-thread-11":
  waiting for ownable synchronizer 0x00000007bd812568, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
  which is held by "pool-8-thread-4"
"pool-8-thread-4":
  waiting for ownable synchronizer 0x000000070a08e9f8, (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync),
  which is held by "pool-8-thread-1"
"pool-8-thread-1":
  waiting for ownable synchronizer 0x00000007bd812568, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
  which is held by "pool-8-thread-4"

Java stack information for the threads listed above:
===================================================
"pool-8-thread-11":
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000007bd812568> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
	at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
	at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
	at org.drools.core.common.NamedEntryPoint.insert(NamedEntryPoint.java:190)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:1477)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:1432)
	at com.sample.CallKjarTest$2.run(CallKjarTest.java:66)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
"pool-8-thread-4":
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x000000070a08e9f8> (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:964)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1282)
	at java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:731)
	at org.drools.core.impl.KnowledgeBaseImpl.readLock(KnowledgeBaseImpl.java:700)
	at org.drools.core.common.NamedEntryPoint.insert(NamedEntryPoint.java:191)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:1477)
	at org.drools.core.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:1432)
	at com.sample.CallKjarTest$2.run(CallKjarTest.java:66)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
"pool-8-thread-1":
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000007bd812568> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
	at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:214)
	at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:290)
	at org.drools.core.common.NamedEntryPoint.delete(NamedEntryPoint.java:481)
	at org.drools.core.common.NamedEntryPoint.delete(NamedEntryPoint.java:468)
        at org.drools.core.impl.StatefulKnowledgeSessionImpl$WorkingMemoryReteExpireAction.execute(StatefulKnowledgeSessionImpl.java:1779)
        at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:96)
        at org.drools.core.phreak.SynchronizedPropagationList.flush(SynchronizedPropagationList.java:69)
        at org.drools.core.impl.StatefulKnowledgeSessionImpl.flushPropagations(StatefulKnowledgeSessionImpl.java:2007)
        at org.drools.core.phreak.AddRemoveRule.removeRule(AddRemoveRule.java:153)
        at org.drools.core.reteoo.ReteooBuilder.removeTerminalNode(ReteooBuilder.java:161)
        at org.drools.core.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:155)
        - locked <0x00000007bd7cbfd8> (a org.drools.core.reteoo.ReteooBuilder)
        at org.drools.core.impl.KnowledgeBaseImpl.removeRule(KnowledgeBaseImpl.java:1608)
        at org.drools.core.impl.KnowledgeBaseImpl.removeRule(KnowledgeBaseImpl.java:1599)
        at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.preProcessRules(KnowledgeBuilderImpl.java:1141)
        at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.compileRules(KnowledgeBuilderImpl.java:1084)
        at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.compileAllRules(KnowledgeBuilderImpl.java:967)
        at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildRules(CompositeKnowledgeBuilderImpl.java:256)
        at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildPackages(CompositeKnowledgeBuilderImpl.java:120)
        at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:104)
        at org.drools.compiler.kie.builder.impl.KieContainerImpl.rebuildAll(KieContainerImpl.java:369)
        at org.drools.compiler.kie.builder.impl.KieContainerImpl.update(KieContainerImpl.java:207)
        at org.drools.compiler.kie.builder.impl.KieContainerImpl.updateToVersion(KieContainerImpl.java:128)
        at com.sample.CallKjarTest$1.run(CallKjarTest.java:45)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)

Found 1 deadlock.