The following test is failing in the JDK23 CI:

java/util/zip/EntryCount64k.java

Here's a snippet from the linux-x64 log file:

#section:main
----------messages:(6/233)----------
command: main EntryCount64k
reason: User specified action: run main/othervm EntryCount64k
started: Fri May 17 19:44:18 UTC 2024
Mode: othervm [/othervm specified]
finished: Fri May 17 19:44:21 UTC 2024
elapsed time (seconds): 2.774
----------configuration:(0/0)----------
----------System.out:(5/1855)----------
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/3/java/util/zip/EntryCount64k.d:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+23-1890/src.full/open/test/jdk/java/util/zip:/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/3/test/lib:/opt/mach5/mesos/work_dir/jib-master/install/jdk-23+23-1890/src.full/open/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 -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 -jar EntryCount64k-tmp.zip ]
[2024-05-17T19:44:21.103006907Z] Gathering output for process 1234778
[2024-05-17T19:44:21.256628108Z] Waiting for completion for process 1234778
[2024-05-17T19:44:21.396841417Z] Waiting for completion finished for process 1234778
Output and diagnostic info for process 1234778 was saved into 'pid-1234778-output.log'
----------System.err:(24/1383)*----------
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.
entryCount=65533 shouldUseZip64=false usesZip64=false zipSize=6797033

 stdout: [Main];
 stderr: [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.
]
 exitValue = 0

java.lang.RuntimeException: '\\A\\Z' missing from stderr
at jdk.test.lib.process.OutputAnalyzer.stderrShouldMatch(OutputAnalyzer.java:407)
at EntryCount64k.checkCanRead(EntryCount64k.java:166)
at EntryCount64k.test(EntryCount64k.java:108)
at EntryCount64k.main(EntryCount64k.java:64)
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.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1575)

JavaTest Message: Test threw exception: java.lang.RuntimeException: '\\A\\Z' missing from stderr
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: '\\A\\Z' missing from stderr
----------rerun:(39/6874)*----------


The following output on stderr might be the root cause here:

 stderr: [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.
]

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?