ADDITIONAL SYSTEM INFORMATION :
openjdk version "11.0.1" 2018-10-16
OpenJDK Runtime Environment 18.9 (build 11.0.1+13)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.1+13, mixed mode)

A DESCRIPTION OF THE PROBLEM :
Occasionally we see stack traces like the following on our production servers

Exception in thread "main" java.nio.BufferUnderflowException
at java.base/java.nio.Buffer.nextGetIndex(Buffer.java:641)
at java.base/java.nio.HeapByteBuffer.get(HeapByteBuffer.java:162)
at java.base/sun.security.ssl.ClientHello$ClientHelloMessage.<init>(ClientHello.java:166)
at java.base/sun.security.ssl.ClientHello$ClientHelloConsumer.consume(ClientHello.java:803)
at java.base/sun.security.ssl.SSLHandshake.consume(SSLHandshake.java:392)
at java.base/sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:444)
at java.base/sun.security.ssl.SSLEngineImpl$DelegatedTask$DelegatedAction.run(SSLEngineImpl.java:1065)
at java.base/sun.security.ssl.SSLEngineImpl$DelegatedTask$DelegatedAction.run(SSLEngineImpl.java:1052)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/sun.security.ssl.SSLEngineImpl$DelegatedTask.run(SSLEngineImpl.java:999)
at ... application specific methods ...
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)

Is it expected behavior for delegated tasks created by javax.net.ssl.SSLEngine to throw RuntimeExceptions of type java.nio.BufferUnderflowException?

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Not reproducible, happens occasionally on production servers.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No RuntimeExceptions are thrown from delegated tasks created by javax.net.ssl.SSLEngine.
ACTUAL -
RuntimeExceptions are thrown from delegated tasks created by javax.net.ssl.SSLEngine.

FREQUENCY : occasionally