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java.lang.AssertionError at water.Lockable$Unlock.atomic(Lockable.java:178) at water.Lockable$Unlock.atomic(Lockable.java:174) at water.TAtomic.atomic(TAtomic.java:19) at water.Atomic.compute2(Atomic.java:57) at water.Atomic.fork(Atomic.java:42) at water.Atomic.invoke(Atomic.java:34) at water.Lockable.unlock(Lockable.java:169) at hex.rf.RandomForest.build(RandomForest.java:56) at hex.rf.DRF$DRFTask.lcompute(DRF.java:161) at water.DRemoteTask.compute2(DRemoteTask.java:91) at water.H2O$H2OCountedCompleter.compute(H2O.java:712) at jsr166y.CountedCompleter.exec(CountedCompleter.java:429) at jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:263) at jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:974) at jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1477) at jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104)