The following test failed in the JDK21 CI:

serviceability/tmtools/jstat/GcTest01.java

Here's a snippet from the log file:

#section:main
----------messages:(7/395)----------
command: main -XX:+UsePerfData -Xmx128M GcTest01
reason: User specified action: run main/othervm -XX:+UsePerfData -Xmx128M GcTest01
started: Tue Apr 04 13:07:50 UTC 2023
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.base --add-exports java.base/jdk.internal.misc=ALL-UNNAMED
finished: Tue Apr 04 13:08:36 UTC 2023
elapsed time (seconds): 45.912
----------configuration:(4/115)----------
Boot Layer
  add modules: java.base
  add exports: java.base/jdk.internal.misc ALL-UNNAMED

----------System.out:(6/810)*----------
[2023-04-04T13:08:24.178037Z] started process 14860 [c:\\ade\\mesos\\work_dir\\jib-master\\install\\jdk-21+17-1364\\windows-x64-debug.jdk\\jdk-21\\fastdebug\\bin\\jstat.exe, -gc, 50664] with out/err redirected to '.\\out.9558669330768894846.txt' and '.\\err.9558669330768894846.txt'
[2023-04-04T13:08:33.302017500Z] process 14860 finished with exit code = 0
Process output: Exit code: 0
stdout: S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT CGC CGCT GCT
        0.0 1024.0 0.0 960.0 7168.0 2152.4 0.0 0.0 1600.0 1422.9 128.0 24.2 2 0.008 0 0.000 2 0.026 0.051
stderr:
----------System.err:(13/1017)----------
java.lang.RuntimeException: GCT != (YGCT + CGCT + FGCT) (GCT = 0.051, YGCT = 0.008, CGCT = 0.026, FGCT = 0.0, (YCGT + CGCT + FGCT) = 0.034)
at utils.JstatResults.assertThat(JstatResults.java:172)
at utils.JstatGcResults.assertConsistency(JstatGcResults.java:123)
at GcTest01.main(GcTest01.java:52)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
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:1623)

JavaTest Message: Test threw exception: java.lang.RuntimeException: GCT != (YGCT + CGCT + FGCT) (GCT = 0.051, YGCT = 0.008, CGCT = 0.026, FGCT = 0.0, (YCGT + CGCT + FGCT) = 0.034)
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: GCT != (YGCT + CGCT + FGCT) (GCT = 0.051, YGCT = 0.008, CGCT = 0.026, FGCT = 0.0, (YCGT + CGCT + FGCT) = 0.034)
----------rerun:(53/7521)*----------