This has been observed in jigsaw nightly runs. Two tests fail:
javax/rmi/PortableRemoteObject/8146975/RmiIiopReturnValueTest.java
javax/rmi/PortableRemoteObject/ConcurrentHashMapTest.java

Please refer to test output below:
----------messages:(5/486)----------
command: main -Djava.naming.provider.url=iiop://localhost:5050 -Djava.naming.factory.initial=com.sun.jndi.cosnaming.CNCtxFactory RmiIiopReturnValueTest -port 5049
reason: User specified action: run main/othervm -Djava.naming.provider.url=iiop://localhost:5050 -Djava.naming.factory.initial=com.sun.jndi.cosnaming.CNCtxFactory RmiIiopReturnValueTest -port 5049
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.corba
elapsed time (seconds): 24.494
----------configuration:(3/38)----------
Boot Layer
  add modules: java.corba

----------System.out:(22/1586)----------

Starting orbd with NS port 5050 and activation port 5049
RmiIiopReturnValueTest: Executing: [/Users/aurora/CommonData/jdk/bin/orbd, -J-d64, -ORBInitialHost, localhost, -ORBInitialPort, 5050, -port, 5049]

Starting RmiIiopServer
RmiIiopReturnValueTest: Executing: [/Users/aurora/CommonData/jdk/bin/java, --add-modules, java.corba, -Djava.naming.factory.initial=com.sun.jndi.cosnaming.CNCtxFactory, -Djava.naming.provider.url=iiop://localhost:5050, -cp, /Users/aurora/sandbox/gresults/testoutput/jdk_other/JTwork/classes/javax/rmi/PortableRemoteObject/8146975:/Users/aurora/sandbox/testbase/jdk/test/javax/rmi/PortableRemoteObject/8146975:/Users/aurora/sandbox/gresults/testoutput/jdk_other/JTwork/classes/lib/testlibrary:/Users/aurora/sandbox/testbase/jdk/test/lib/testlibrary:/Users/aurora/CommonData/jtreg/lib/javatest.jar:/Users/aurora/CommonData/jtreg/lib/jtreg.jar, HelloServer, -port, 5049]
RmiIiopReturnValueTest.executeRmiIiopClient: HelloClient.executeRmiClientCall
HelloClient.main: enter ...
HelloClient.main: HelloService lookup ...
HelloClient.main: HelloService lookup ...
HelloClient.main: HelloService lookup ...
HelloClient.main: HelloService lookup ...
HelloClient.main: HelloService lookup ...
HelloClient.main: HelloService lookup ...
HelloClient.main: HelloService lookup ...
HelloClient.main: HelloService lookup ...
HelloClient.main: HelloService lookup ...
HelloClient.main: HelloService lookup ...
RmiIiopReturnValueTest.stopRmiIiopServer: destroy rmiServerProcess
serverProcess exitCode:9
RmiIiopReturnValueTest.stopOrbd: destroy orbdProcess
orbd exitCode:9
----------System.err:(85/5723)----------
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
NameNotFoundException Caught .... try again
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
NameNotFoundException Caught .... try again
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
NameNotFoundException Caught .... try again
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
NameNotFoundException Caught .... try again
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
NameNotFoundException Caught .... try again
java.lang.IllegalArgumentException: Only instances of org.omg.CORBA.Object can be bound
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.callBindOrRebind(CNCtx.java:602)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:693)
at java.corba@9-ea/com.sun.jndi.cosnaming.CNCtx.rebind(CNCtx.java:710)
at java.naming/javax.naming.InitialContext.rebind(InitialContext.java:425)
at HelloServer.main(HelloServer.java:42)
NameNotFoundException Caught .... try again
NameNotFoundException Caught .... try again
NameNotFoundException Caught .... try again
NameNotFoundException Caught .... try again
NameNotFoundException Caught .... try again
HelloClient terminating
java.lang.RuntimeException: Expected Response not received
at RmiIiopReturnValueTest.stopTestComponents(RmiIiopReturnValueTest.java:85)
at RmiIiopReturnValueTest.main(RmiIiopReturnValueTest.java:67)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:537)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:110)
at java.base/java.lang.Thread.run(Thread.java:844)