JDWP test failure: StreamCorruptedException: invalid stream header: 50524920

Test: vmTestbase/nsk/jdwp/ReferenceType/Instances/instances002/instances002.java

Resuming debugee VM
Waiting for signal from debugee: ready
java.io.StreamCorruptedException: invalid stream header: 50524920
at java.base/java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:987)
at java.base/java.io.ObjectInputStream.<init>(ObjectInputStream.java:414)
at nsk.share.jpda.SocketConnection.makeSocketStreams(SocketConnection.java:639)
at nsk.share.jpda.BasicSocketConnection.onConnected(SocketConnection.java:350)
at nsk.share.jpda.SocketConnection.onConnected(SocketConnection.java:559)
at nsk.share.jpda.BasicSocketConnection.accept(SocketConnection.java:201)
at nsk.share.jpda.SocketConnection.accept(SocketConnection.java:453)
at nsk.share.jpda.SocketIOPipe$ListenerThread.run(SocketIOPipe.java:225)
# ERROR: Caught unexpected exception:
# ERROR: nsk.share.Failure: Caught exception while making streams for PipeIO Listener Thread connection:
# ERROR: java.io.StreamCorruptedException: invalid stream header: 50524920

The header value is "PRI " in ascii.

These kinds of errors have been seen in the past but seem to just be glitches e.g. JDK-8209565