The following test timed out in the JDK16 CI:

jdk/jfr/api/consumer/recordingstream/TestOnEvent.java

Here's a snippet from the log file:

#section:main
----------messages:(7/350)----------
command: main jdk.jfr.api.consumer.recordingstream.TestOnEvent
reason: User specified action: run main/othervm jdk.jfr.api.consumer.recordingstream.TestOnEvent
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jfr,java.management
Timeout information:
--- Timeout information end.
elapsed time (seconds): 517.512
----------configuration:(3/51)----------
Boot Layer
  add modules: jdk.jfr java.management

----------System.out:(65/2448)----------
Entering testOnEventNull()
Leaving testOnEventNull()
Entering testOnEvent()
Leaving testOnEvent()
Entering testNamedEvent()
TestNamedEvent:A {
  startTime = 11:33:15.163
  eventThread = "MainThread" (javaThreadId = 13)
  stackTrace = [
    jdk.jfr.api.consumer.recordingstream.TestOnEvent.testNamedEvent() line: 129
    jdk.jfr.api.consumer.recordingstream.TestOnEvent.main(String[]) line: 59
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Method, Object, Object[])
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Object, Object[]) line: 64
    jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43
    ...
  ]
}


TestNamedEvent:C {
  startTime = 11:33:15.174
  eventThread = "MainThread" (javaThreadId = 13)
  stackTrace = [
    jdk.jfr.api.consumer.recordingstream.TestOnEvent.testNamedEvent() line: 131
    jdk.jfr.api.consumer.recordingstream.TestOnEvent.main(String[]) line: 59
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Method, Object, Object[])
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Object, Object[]) line: 64
    jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43
    ...
  ]
}


Leaving testNamedEvent()
Entering testTwoEventWithSameName()
testTwoEventWithSameNameA {
  startTime = 11:33:18.220
  eventThread = "MainThread" (javaThreadId = 13)
  stackTrace = [
    jdk.jfr.api.consumer.recordingstream.TestOnEvent.testTwoEventWithSameName() line: 101
    jdk.jfr.api.consumer.recordingstream.TestOnEvent.main(String[]) line: 60
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Method, Object, Object[])
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Object, Object[]) line: 64
    jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43
    ...
  ]
}


testTwoEventWithSameNameA {
  startTime = 11:33:18.235
  eventThread = "MainThread" (javaThreadId = 13)
  stackTrace = [
    jdk.jfr.api.consumer.recordingstream.TestOnEvent.testTwoEventWithSameName() line: 103
    jdk.jfr.api.consumer.recordingstream.TestOnEvent.main(String[]) line: 60
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Method, Object, Object[])
    jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Object, Object[]) line: 64
    jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43
    ...
  ]
}


Leaving testTwoEventWithSameName()
Timeout refired 480 times
----------System.err:(0/0)----------
----------rerun:(41/8037)*----------