The following test failed in the JDK23 CI:

java/util/logging/LoggingDeadlock2.java

Here's a snippet from the log file:

#section:main
----------messages:(7/223)----------
command: main LoggingDeadlock2
reason: User specified action: run main LoggingDeadlock2
started: Fri May 17 19:38:07 UTC 2024
Mode: agentvm
Agent id: 18
finished: Fri May 17 19:38:09 UTC 2024
elapsed time (seconds): 2.045
----------configuration:(14/1845)----------

<snip>

----------System.out:(19/5222)----------
[-classpath, /opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S15509/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ce0e5d10-174f-45de-bc3d-8c5debd321ac/runs/44ca1ee7-8959-4d3e-8707-f1edafdc0b1a/testoutput/test-support/jtreg_open_test_jdk_jdk_util/classes/1/java/util/logging/LoggingDeadlock2.d:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+23-1890/src.full/open/test/jdk/java/util/logging:/opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S15509/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ce0e5d10-174f-45de-bc3d-8c5debd321ac/runs/44ca1ee7-8959-4d3e-8707-f1edafdc0b1a/testoutput/test-support/jtreg_open_test_jdk_jdk_util/classes/1/test/lib:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/jtreg.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/junit-platform-console-standalone-1.9.2.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/testng-7.3.0.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/jcommander-1.82.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/guice-5.1.0.jar, LoggingDeadlock2$JavaChild]
Command line: [/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+23-1890/linux-x64-debug.jdk/jdk-23/fastdebug/bin/java -cp /opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S15509/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ce0e5d10-174f-45de-bc3d-8c5debd321ac/runs/44ca1ee7-8959-4d3e-8707-f1edafdc0b1a/testoutput/test-support/jtreg_open_test_jdk_jdk_util/classes/1/java/util/logging/LoggingDeadlock2.d:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+23-1890/src.full/open/test/jdk/java/util/logging:/opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S15509/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ce0e5d10-174f-45de-bc3d-8c5debd321ac/runs/44ca1ee7-8959-4d3e-8707-f1edafdc0b1a/testoutput/test-support/jtreg_open_test_jdk_jdk_util/classes/1/test/lib:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/jtreg.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/junit-platform-console-standalone-1.9.2.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/testng-7.3.0.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/jcommander-1.82.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/guice-5.1.0.jar -Xmx768m -XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=/opt/mach5/mesos/work_dir/jib-master/install/jdk/22/36/bundles/linux-x64/jdk-22_linux-x64_bin.tar.gz/jdk-22 -Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S15509/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ce0e5d10-174f-45de-bc3d-8c5debd321ac/runs/44ca1ee7-8959-4d3e-8707-f1edafdc0b1a/testoutput/test-support/jtreg_open_test_jdk_jdk_util/tmp -ea -esa -XX:+UseZGC -XX:-ZGenerational -classpath /opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S15509/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ce0e5d10-174f-45de-bc3d-8c5debd321ac/runs/44ca1ee7-8959-4d3e-8707-f1edafdc0b1a/testoutput/test-support/jtreg_open_test_jdk_jdk_util/classes/1/java/util/logging/LoggingDeadlock2.d:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+23-1890/src.full/open/test/jdk/java/util/logging:/opt/mach5/mesos/work_dir/slaves/a4a7850a-7c35-410a-b879-d77fbb2f6087-S15509/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/ce0e5d10-174f-45de-bc3d-8c5debd321ac/runs/44ca1ee7-8959-4d3e-8707-f1edafdc0b1a/testoutput/test-support/jtreg_open_test_jdk_jdk_util/classes/1/test/lib:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/jtreg.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/junit-platform-console-standalone-1.9.2.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/testng-7.3.0.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/jcommander-1.82.jar:/opt/mach5/mesos/work_dir/jib-master/install/jtreg/7.3.1/1/bundles/jtreg-7.3.1+1.zip/jtreg/lib/guice-5.1.0.jar LoggingDeadlock2$JavaChild ]
Waiting for child process to exit
Java HotSpot(TM) 64-Bit Server VM warning: Option ZGenerational was deprecated in version 23.0 and will likely be removed in a future release.
Java HotSpot(TM) 64-Bit Server VM warning: Non-generational ZGC is deprecated.
JavaChild started
seed=8923185888594799393
dojoin=true
iters1=237
iters2=787
exiter started
$
Child exited with status: 99
Java HotSpot(TM) 64-Bit Server VM warning: Option ZGenerational was deprecated in version 23.0 and will likely be removed in a future release.
Java HotSpot(TM) 64-Bit Server VM warning: Non-generational ZGC is deprecated.
 not equal to

Passed = 4, failed = 1

----------System.err:(21/1204)----------
java.lang.Exception: Stack trace
at java.base/java.lang.Thread.dumpStack(Thread.java:2148)
at LoggingDeadlock2.fail(LoggingDeadlock2.java:323)
at LoggingDeadlock2.fail(LoggingDeadlock2.java:324)
at LoggingDeadlock2.equal(LoggingDeadlock2.java:330)
at LoggingDeadlock2.realMain(LoggingDeadlock2.java:91)
at LoggingDeadlock2.main(LoggingDeadlock2.java:332)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
at java.base/java.lang.Thread.run(Thread.java:1575)
java.lang.AssertionError: Some tests failed
at LoggingDeadlock2.main(LoggingDeadlock2.java:334)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:333)
at java.base/java.lang.Thread.run(Thread.java:1575)

JavaTest Message: Test threw exception: java.lang.AssertionError
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.AssertionError: Some tests failed

It appears that the failure is due to the following unexpected output:

Child exited with status: 99
Java HotSpot(TM) 64-Bit Server VM warning: Option ZGenerational was deprecated in version 23.0 and will likely be removed in a future release.
Java HotSpot(TM) 64-Bit Server VM warning: Non-generational ZGC is deprecated.
 not equal to

Passed = 4, failed = 1

I believe that rather obscure diagnostic means that an empty stderr
was expected for this test, but that's just my guess.

This test failure has happened on macosx-x64, windows-x64
and linux-x64 in jdk-23+23-1890-tier8 and that build-ID includes
the fix for:

JDK-8326957 Implement JEP 474: ZGC: Generational Mode by Default

The test task's JVM args are: -XX:+UseZGC -XX:-ZGenerational

Should these task definitions have been modified by JDK-8326957?