The jtreg test TestEmergencyDumpAtOOM.java runs into the following error on ppc64 platforms :
java.io.IOException: Not a valid Flight Recorder file. File length is only 0 bytes.
at jdk.jfr/jdk.jfr.internal.consumer.RecordingInput.initialize(RecordingInput.java:93)
at jdk.jfr/jdk.jfr.internal.consumer.RecordingInput.<init>(RecordingInput.java:82)
at jdk.jfr/jdk.jfr.internal.consumer.RecordingInput.<init>(RecordingInput.java:98)
at jdk.jfr/jdk.jfr.internal.consumer.EventFileStream.<init>(EventFileStream.java:49)
at jdk.jfr/jdk.jfr.consumer.EventStream.openFile(EventStream.java:162)
at jdk.jfr.event.oldobject.TestEmergencyDumpAtOOM.test(TestEmergencyDumpAtOOM.java:91)
at jdk.jfr.event.oldobject.TestEmergencyDumpAtOOM.main(TestEmergencyDumpAtOOM.java:114)
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:1474)

Seems the test fails in the case setting additionally -XX:+CrashOnOutOfMemoryError .
In the output some info about a timeout can be seen :

[thread 2730068 also had an error] <----------------------------------------- seems this is the "JFR Periodic Tasks"
------ Timeout during error reporting after 120 s. ------
# [ timer expired, abort... ]