The following test timed out in the JDK25 CI:

jdk/jfr/api/consumer/TestRecordingFileWrite.java

Here's a snippet from the log file:

#section:main
----------messages:(10/436)----------
command: main jdk.jfr.api.consumer.TestRecordingFileWrite
reason: User specified action: run main/othervm jdk.jfr.api.consumer.TestRecordingFileWrite
started: Tue Jun 03 07:41:58 UTC 2025
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jfr,java.management
Process id: 4187214
Timeout information:
--- Timeout information end.
finished: Tue Jun 03 07:51:25 UTC 2025
elapsed time (seconds): 567.27
----------configuration:(3/51)----------
Boot Layer
  add modules: jdk.jfr java.management

----------System.out:(50/1514)----------
jdk.OldObjectSample {
  startTime = 07:42:04.270 (2025-06-03)
  allocationTime = 07:42:00.499 (2025-06-03)
  objectSize = 256.0 kB
  objectAge = 3.77 s
  lastKnownHeapUsage = 1.6 MB
  object = [
    java.util.concurrent.ConcurrentHashMap$Node[65536]
  ]
  arrayElements = 65536
  root = N/A
  eventThread = "MainThread" (javaThreadId = 25)
  stackTrace = [
    java.util.concurrent.ConcurrentHashMap.initTable() line: 2317
    java.util.concurrent.ConcurrentHashMap.putVal(Object, Object, boolean) line: 1029
    java.util.concurrent.ConcurrentHashMap.put(Object, Object) line: 1018
    jdk.jfr.internal.StringPool.storeString(String, boolean) line: 103
    jdk.jfr.internal.StringPool.addString(String, boolean) line: 142
    ...
  ]
}


jdk.OldObjectSample {
  startTime = 07:42:04.270 (2025-06-03)
  allocationTime = 07:42:00.969 (2025-06-03)
  objectSize = 106.3 kB
  objectAge = 3.30 s
  lastKnownHeapUsage = 1.6 MB
  object = [
    byte[108868]
  ]
  arrayElements = 108868
  root = N/A
  eventThread = "JFR Periodic Tasks" (javaThreadId = 27)
  stackTrace = [
    java.util.Arrays.copyOf(byte[], int) line: 3537
    java.io.ByteArrayOutputStream.toByteArray() line: 187
    jdk.jfr.internal.MetadataRepository.getBinaryRepresentation() line: 283
    jdk.jfr.internal.MetadataRepository.storeDescriptorInJVM() line: 253
    jdk.jfr.internal.MetadataRepository.flush() line: 367
    ...
  ]
}


Original size: 30917523
Scrubbed size: 3402150
Scrubbed event count: 100957
Timeout signalled after 480 seconds
----------System.err:(0/0)----------
----------rerun:(40/7314)*----------


This first sighting is in Tier5 on linux-aarch64-debug, but there have since
been sightings on linux-x64-debug, windows-x64 debug and macosx-x64.
So far, the timeout has not been send in the JDK25 CI on maces-aarch64.

In some cases the test PASSes while the timeout handler is running
and some cases (like this sighting) do not.