The following test failed in the JDK16 CI:

sun/rmi/transport/tcp/DeadCachedConnection.java

Here's a snippet from the log file:

#section:main
----------messages:(5/439)----------
command: main DeadCachedConnection
reason: User specified action: run main/othervm DeadCachedConnection
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.rmi --add-exports java.rmi/sun.rmi.registry=ALL-UNNAMED --add-exports java.rmi/sun.rmi.server=ALL-UNNAMED --add-exports java.rmi/sun.rmi.transport=ALL-UNNAMED --add-exports java.rmi/sun.rmi.transport.tcp=ALL-UNNAMED
elapsed time (seconds): 3.751
----------configuration:(7/291)----------
Boot Layer
  add modules: java.rmi
  add exports: java.rmi/sun.rmi.registry ALL-UNNAMED
               java.rmi/sun.rmi.server ALL-UNNAMED
               java.rmi/sun.rmi.transport ALL-UNNAMED
               java.rmi/sun.rmi.transport.tcp ALL-UNNAMED

----------System.out:(2/88)----------
RegistryRunner.port.start:49153:RegistryRunner.port.end
Starting registry on port 49153
----------System.err:(69/6053)----------
JAVAVM: command = [/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-16+4-108/macosx-x64.jdk/jdk-16.jdk/Contents/Home/bin/java, -Xmx512m, -XX:MaxRAMPercentage=4, -Djava.io.tmpdir=/System/Volumes/Data/mesos/work_dir/slaves/52628e90-e5e7-4ef3-af97-10d8776d10db-S831/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/e12c0188-02ec-4eb2-a554-deeafa485727/runs/981c682a-5178-440c-9ebe-32b8ba99c8e5/testoutput/test-support/jtreg_open_test_jdk_tier3/tmp, -ea, -esa, -Djava.security.policy=/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-16+4-108/src.full/open/test/jdk/sun/rmi/transport/tcp/registry.security.policy, --add-exports=java.rmi/sun.rmi.registry=ALL-UNNAMED, --add-exports=java.rmi/sun.rmi.server=ALL-UNNAMED, --add-exports=java.rmi/sun.rmi.transport=ALL-UNNAMED, --add-exports=java.rmi/sun.rmi.transport.tcp=ALL-UNNAMED, RegistryRunner, 0]
registry is running at port: 49153
Locating just-started registry...
Connecting to registry...
Killing registry...
received call to exit
Restarting registry...
JAVAVM: command = [/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-16+4-108/macosx-x64.jdk/jdk-16.jdk/Contents/Home/bin/java, -Xmx512m, -XX:MaxRAMPercentage=4, -Djava.io.tmpdir=/System/Volumes/Data/mesos/work_dir/slaves/52628e90-e5e7-4ef3-af97-10d8776d10db-S831/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/e12c0188-02ec-4eb2-a554-deeafa485727/runs/981c682a-5178-440c-9ebe-32b8ba99c8e5/testoutput/test-support/jtreg_open_test_jdk_tier3/tmp, -ea, -esa, -Djava.security.policy=/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-16+4-108/src.full/open/test/jdk/sun/rmi/transport/tcp/registry.security.policy, --add-exports=java.rmi/sun.rmi.registry=ALL-UNNAMED, --add-exports=java.rmi/sun.rmi.server=ALL-UNNAMED, --add-exports=java.rmi/sun.rmi.transport=ALL-UNNAMED, --add-exports=java.rmi/sun.rmi.transport.tcp=ALL-UNNAMED, RegistryRunner, 49153]
Port already in use: 49153; nested exception is:
java.net.BindException: Address already in use
java.rmi.server.ExportException: Port already in use: 49153; nested exception is:
java.net.BindException: Address already in use
at java.rmi/sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:346)
at java.rmi/sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:243)
at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:412)
at java.rmi/sun.rmi.transport.LiveRef.exportObject(LiveRef.java:147)
at java.rmi/sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:234)
at java.rmi/sun.rmi.registry.RegistryImpl.setup(RegistryImpl.java:220)
at java.rmi/sun.rmi.registry.RegistryImpl.<init>(RegistryImpl.java:205)
at java.rmi/java.rmi.registry.LocateRegistry.createRegistry(LocateRegistry.java:203)
at RegistryRunner.init(RegistryRunner.java:115)
at RegistryRunner.main(RegistryRunner.java:150)
Caused by: java.net.BindException: Address already in use
at java.base/sun.nio.ch.Net.bind0(Native Method)
at java.base/sun.nio.ch.Net.bind(Net.java:548)
at java.base/sun.nio.ch.Net.bind(Net.java:537)
at java.base/sun.nio.ch.NioSocketImpl.bind(NioSocketImpl.java:643)
at java.base/java.net.ServerSocket.bind(ServerSocket.java:396)
at java.base/java.net.ServerSocket.<init>(ServerSocket.java:282)
at java.base/java.net.ServerSocket.<init>(ServerSocket.java:173)
at java.rmi/sun.rmi.transport.tcp.TCPDirectSocketFactory.createServerSocket(TCPDirectSocketFactory.java:45)
at java.rmi/sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(TCPEndpoint.java:670)
at java.rmi/sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:335)
... 9 more
TEST FAILED: [RegistryVM] registry sub-process exited with status 255.
TEST FAILED:
Test failed with: TEST FAILED: [RegistryVM] registry sub-process exited with status 255.
TestFailedException: TEST FAILED: [RegistryVM] registry sub-process exited with status 255.
at TestLibrary.bomb(TestLibrary.java:121)
at TestLibrary.bomb(TestLibrary.java:124)
at RegistryVM.start(RegistryVM.java:156)
at DeadCachedConnection.makeRegistry(DeadCachedConnection.java:104)
at DeadCachedConnection.main(DeadCachedConnection.java:86)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)
TestFailedException: TEST FAILED: ; nested exception is:
TestFailedException: TEST FAILED: [RegistryVM] registry sub-process exited with status 255.
TestFailedException: TEST FAILED: [RegistryVM] registry sub-process exited with status 255.
at TestLibrary.bomb(TestLibrary.java:121)
at TestLibrary.bomb(TestLibrary.java:124)
at RegistryVM.start(RegistryVM.java:156)
at DeadCachedConnection.makeRegistry(DeadCachedConnection.java:104)
at DeadCachedConnection.main(DeadCachedConnection.java:86)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)

JavaTest Message: Test threw exception: TestFailedException: TEST FAILED: ; nested exception is:
TestFailedException: TEST FAILED: [RegistryVM] registry sub-process exited with status 255.
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: TestFailedException: TEST FAILED: ; nested exception is: TestFailedException: TEST FAILED: [RegistryVM] registry sub-process exited with status 255.
----------rerun:(42/7474)*----------