LazyCachedNode exception under heavy concurrent load

ava.util.concurrent.ExecutionException: org.modeshape.jcr.cache.NodeNotFoundInParentException: Cannot locate child node: d0150539c98d674408bb53-7405-450e-908b-be0e566ff830 within parent: d0150539c98d67/
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:232)
at java.util.concurrent.FutureTask.get(FutureTask.java:91)
at org.modeshape.jcr.ConcurrentLoadTest.shouldCreateLotsOfCustomersUnderSingleHierarchy(ConcurrentNodeLoadTest.java:130)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:30)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:202)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:65)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: org.modeshape.jcr.cache.NodeNotFoundInParentException: Cannot locate child node: d0150539c98d674408bb53-7405-450e-908b-be0e566ff830 within parent: d0150539c98d67/
at org.modeshape.jcr.cache.document.LazyCachedNode.parentReferenceToSelf(LazyCachedNode.java:212)
at org.modeshape.jcr.cache.document.LazyCachedNode.getSegment(LazyCachedNode.java:250)
at org.modeshape.jcr.cache.document.LazyCachedNode.getPath(LazyCachedNode.java:259)
at org.modeshape.jcr.cache.document.LazyCachedNode.getPath(LazyCachedNode.java:258)
at org.modeshape.jcr.cache.document.LazyCachedNode.getPath(LazyCachedNode.java:258)
at org.modeshape.jcr.AbstractJcrNode.path(AbstractJcrNode.java:234)
at org.modeshape.jcr.AbstractJcrNode.addNode(AbstractJcrNode.java:1063)
at org.modeshape.jcr.AbstractJcrNode.addNode(AbstractJcrNode.java:980)
at org.modeshape.jcr.AbstractJcrNode.addNode(AbstractJcrNode.java:108)
at org.modeshape.jcr.ConcurrentNodeLoadTest.addContentToCustomer(ConcurrentNodeLoadTest.java:228)
at org.modeshape.jcr.ConcurrentNodeLoadTest$CustomerModifier.call(ConcurrentNodeLoadTest.java:203)
at org.modeshape.jcr.ConcurrentNodeLoadTest$CustomerModifier.call(ConcurrentNodeLoadTest.java:185)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)

java.lang.NullPointerException
at org.modeshape.jcr.cache.document.LazyCachedNode.getSegment(LazyCachedNode.java:250)
at org.modeshape.jcr.cache.document.LazyCachedNode.getPath(LazyCachedNode.java:259)
at org.modeshape.jcr.cache.document.LazyCachedNode.getPath(LazyCachedNode.java:258)
at org.modeshape.jcr.AbstractJcrNode.path(AbstractJcrNode.java:234)
at org.modeshape.jcr.AbstractJcrNode.addNode(AbstractJcrNode.java:1063)
at org.modeshape.jcr.AbstractJcrNode.addNode(AbstractJcrNode.java:980)
at org.modeshape.jcr.AbstractJcrNode.addNode(AbstractJcrNode.java:108)
at org.modeshape.jcr.ConcurrentNodeLoadTest.addContentToCustomer(ConcurrentNodeLoadTest.java:235)
at org.modeshape.jcr.ConcurrentNodeLoadTest$CustomerModifier.call(ConcurrentNodeLoadTest.java:206)
at org.modeshape.jcr.ConcurrentNodeLoadTest$CustomerModifier.call(ConcurrentNodeLoadTest.java:188)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)