Encrypt Content appears to live lock in certain configurations

"Timer-Driven Process Thread-8" prio=10 tid=0x00007f1fb4002000 nid=0x4cc2 runnable [0x00007f1f7cf6a000]
   java.lang.Thread.State: RUNNABLE
        at org.bouncycastle.crypto.digests.GeneralDigest.finish(Unknown Source)
        at org.bouncycastle.crypto.digests.SHA256Digest.doFinal(Unknown Source)
        at org.bouncycastle.crypto.generators.PKCS12ParametersGenerator.generateDerivedKey(Unknown Source)
        at org.bouncycastle.crypto.generators.PKCS12ParametersGenerator.generateDerivedParameters(Unknown Source)
        at org.bouncycastle.jce.provider.PBE$Util.makePBEParameters(Unknown Source)
        at org.bouncycastle.jce.provider.JCEBlockCipher.engineInit(Unknown Source)
        at javax.crypto.Cipher.init(Cipher.java:1183)
        at javax.crypto.Cipher.init(Cipher.java:1120)
        at org.apache.nifi.processors.standard.util.PasswordBasedEncryptor$EncryptCallback.process(PasswordBasedEncryptor.java:238)
        at org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2171)
        at org.apache.nifi.processors.standard.EncryptContent.onTrigger(EncryptContent.java:328)
        at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
        at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1146)
        at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:139)
        at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:49)
        at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:119)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        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)