The new test TestBackToBackSensitive has been added with JDK-8365972 . It failed so far 8 times when running on our test CI. Some failures were on Linux, some on macOS.
Example from Linux x86_64 :
----------System.out:(14/439)----------
Number of chunk files: 4
Timestamps for jdk.ThreadDump:
2025-11-21T04:37:34.151537641Z
2025-11-21T04:37:34.445521345Z
2025-11-21T04:37:34.505821878Z
2025-11-21T04:37:34.531839400Z
2025-11-21T04:37:35.464585744Z
2025-11-21T04:37:35.616923820Z
Timestamps for jdk.ClassLoaderStatistics:
2025-11-21T04:37:34.445064633Z
2025-11-21T04:37:34.505582593Z
2025-11-21T04:37:34.517357380Z
2025-11-21T04:37:35.464328083Z
2025-11-21T04:37:35.616658497Z
----------System.err:(12/877)----------
java.lang.Exception: Expected 6 timestamps for event jdk.ClassLoaderStatistics, but got 5
at jdk.jfr.event.runtime.TestBackToBackSensitive.assertCount(TestBackToBackSensitive.java:119)
at jdk.jfr.event.runtime.TestBackToBackSensitive.main(TestBackToBackSensitive.java:97)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1516)