The following test failed in the JDK20 CI:

javax/management/remote/mandatory/connection/MultiThreadDeadLockTest.java

Here's a snippet from the log file:

#section:main
----------messages:(7/308)----------
command: main MultiThreadDeadLockTest
reason: User specified action: run main MultiThreadDeadLockTest
started: Wed Oct 26 02:49:29 UTC 2022
Mode: othervm
Additional options from @modules: --add-modules java.management,java.management.rmi
finished: Wed Oct 26 02:49:36 UTC 2022
elapsed time (seconds): 6.966
----------configuration:(3/63)----------
Boot Layer
  add modules: java.management java.management.rmi

----------System.out:(46/1904)----------
Create the MBean server
Initialize environment map
Specify a client socket factory to control socket creation.
Specify a server idle timeout to make a server close an idle connection.
Disable client heartbeat.
Create an RMI server
Create jmx client on service:jmx:rmi://ubuntu-22-04-x64-19801/stub/rO0ABXNyAC5qYXZheC5tYW5hZ2VtZW50LnJlbW90ZS5ybWkuUk1JU2VydmVySW1wbF9TdHViAAAAAAAAAAICAAB4cgAaamF2YS5ybWkuc2VydmVyLlJlbW90ZVN0dWLp/tzJi+FlGgIAAHhyABxqYXZhLnJtaS5zZXJ2ZXIuUmVtb3RlT2JqZWN002G0kQxhMx4DAAB4cHciAAtVbmljYXN0UmVmMgEADjEwMC43My4yMDEuMjMxAACvd3NyAChNdWx0aVRocmVhZERlYWRMb2NrVGVzdCRSTUlDbGllbnRGYWN0b3J5rInsFbB/cr0CAAB4cHcXTybQypxA/JG4+V20AAABhBIx4UeAAQB4

---Enter the method createSocket
===Leave the method: createSocket

---Enter the method createSocket
===Leave the method: createSocket
Register the mbean: default:name=toto
Add listener to toto MBean
send notif, listener will block the fetcher

---Enter the method sendNotif
===Leave the method: sendNotif

---Enter the method handleNotification
Sleep 3 times of server idle timeout: 2000, the sever should close the idle connection.
start the user thread to call mbean method, it will get IOexception and start the reconnection, the socket factory will block the socket creation.

---Enter the method createSocket
Free the listener, the fetcher will get IO and makes a deadlock if the bug is not fixed.
===Leave the method: handleNotification

---Enter the method createSocket
Allow to create new socket for the reconnection
Check whether the user thread gets free to call the mbean.
===Leave the method: createSocket
===Leave the method: createSocket

---Enter the method createSocket
===Leave the method: createSocket

---Enter the method createSocket
===Leave the method: createSocket

---Enter the method createSocket
===Leave the method: createSocket

---Enter the method allowReturn
===Leave the method: allowReturn
Remove the listener.
----------System.err:(13/937)----------
javax.management.ListenerNotFoundException: Listener not found
at java.management/com.sun.jmx.remote.internal.ClientNotifForwarder.getListenerId(ClientNotifForwarder.java:231)
at java.management.rmi/javax.management.remote.rmi.RMIConnector$RemoteMBeanServerConnection.removeNotificationListener(RMIConnector.java:1301)
at MultiThreadDeadLockTest.main(MultiThreadDeadLockTest.java:133)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
at java.base/java.lang.Thread.run(Thread.java:1591)

JavaTest Message: Test threw exception: javax.management.ListenerNotFoundException: Listener not found
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: javax.management.ListenerNotFoundException: Listener not found
----------rerun:(36/6087)*----------