The following test timed out in the JDK17 CI:

java/util/concurrent/tck/JSR166TestCase.java

Here's a snippet from the log file:

#section:junit
----------messages:(7/682)----------
command: junit --add-opens java.base/java.util.concurrent=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED -Djsr166.testImplementationDetails=true -Djava.util.concurrent.ForkJoinPool.common.parallelism=0 JSR166TestCase
reason: User specified action: run junit/othervm/timeout=1000 --add-opens java.base/java.util.concurrent=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED -Djsr166.testImplementationDetails=true -Djava.util.concurrent.ForkJoinPool.common.parallelism=0 JSR166TestCase
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.management
Timeout information:
--- Timeout information end.
elapsed time (seconds): 4019.897
----------configuration:(5/175)----------
Boot Layer
  add modules: java.management
  add opens: java.base/java.lang ALL-UNNAMED
               java.base/java.util.concurrent ALL-UNNAMED

----------System.out:(1/27)----------
Timeout refired 4000 times
----------System.err:(36/2438)----------
Looks like we're stuck running test: testForkJoin(ForkJoinPool8Test)
------ stacktrace dump start ------
"main" prio=5 Id=1 WAITING on java.lang.Thread@7d9c9aee
at java.base@17-ea/java.lang.Object.wait(Native Method)
- waiting on java.lang.Thread@7d9c9aee
at java.base@17-ea/java.lang.Thread.join(Thread.java:1301)
at java.base@17-ea/java.lang.Thread.join(Thread.java:1369)
at app//com.sun.javatest.regtest.agent.MainWrapper.main(MainWrapper.java:74)

"Notification Thread" daemon prio=9 Id=12 RUNNABLE

"MainThread" prio=5 Id=14 WAITING on ForkJoinPool8Test$FibAction@32666116
at java.base@17-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on ForkJoinPool8Test$FibAction@32666116
at java.base@17-ea/java.util.concurrent.locks.LockSupport.park(LockSupport.java:341)
at java.base@17-ea/java.util.concurrent.ForkJoinTask.awaitDone(ForkJoinTask.java:327)
at java.base@17-ea/java.util.concurrent.ForkJoinTask.awaitJoin(ForkJoinTask.java:511)
at java.base@17-ea/java.util.concurrent.ForkJoinTask.invokeAll(ForkJoinTask.java:718)
at app//ForkJoinPool8Test$FibAction.realCompute(ForkJoinPool8Test.java:222)
at app//JSR166TestCase$CheckedRecursiveAction.compute(JSR166TestCase.java:1770)
at java.base@17-ea/java.util.concurrent.RecursiveAction.exec(RecursiveAction.java:194)
...

"CompletableFutureDelayScheduler" daemon prio=5 Id=1739 TIMED_WAITING on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@2bb4d65e
at java.base@17-ea/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@2bb4d65e
at java.base@17-ea/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:252)
at java.base@17-ea/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1672)
at java.base@17-ea/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1182)
at java.base@17-ea/java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:899)
at java.base@17-ea/java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1061)
at java.base@17-ea/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1121)
at java.base@17-ea/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
...

------ stacktrace dump end ------
----------rerun:(42/6337)*----------

<snip>

result: Error. Program `/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-17+6-289/linux-aarch64.jdk/jdk-17/bin/java' timed out (timeout set to 4000000ms, elapsed time including timeout handling was 4019890ms).

Starting this bug off as a P2 since this is a Tier1 failure.