The following test failed in the JDK20 CI:

sun/management/jmxremote/bootstrap/RmiSslNoKeyStoreTest.java

Here's a snippet from the log file:

#section:main
----------messages:(6/368)----------
command: main RmiSslNoKeyStoreTest .*_ssltest.*.in
reason: User specified action: run main/timeout=300 RmiSslNoKeyStoreTest .*_ssltest.*.in
Mode: agentvm
Agent id: 54
Additional exports to unnamed modules from @modules: java.management/sun.management jdk.management.agent/jdk.internal.agent jdk.management.agent/sun.management.jmxremote
elapsed time (seconds): 0.368
----------configuration:(19/2272)----------

<snip>

result: Error. Agent communication error: java.io.EOFException; check console log for any additional details

There's no indication of an error except for the above
" Agent communication error: java.io.EOFException".
No hs_err_pid file, no indication of a problem with the test
execution, no core file.

This same failure happened on a linux-aarch64-open and
a linux-aarch64-debug test machine in jdk-20+14-900-tier6.

We recently had the same failure mode with a different test:

JDK-8293335 sun/management/jmxremote/bootstrap/RmiBootstrapTest.java#id1failed with "Agent communication error: java.io.EOFException"