The following new test timed out in the JDK21 CI:

serviceability/jvmti/vthread/StopThreadTest/StopThreadTest.java

Here's a snippet from the log file:

#section:main
----------messages:(8/343)----------
command: main -agentlib:StopThreadTest StopThreadTest
reason: User specified action: run main/othervm/native -agentlib:StopThreadTest StopThreadTest
started: Thu May 11 23:54:49 GMT 2023
Mode: othervm [/othervm specified]
Timeout information:
--- Timeout information end.
finished: Fri May 12 00:03:53 GMT 2023
elapsed time (seconds): 543.32
----------configuration:(0/0)----------
----------System.out:(15/446)----------
Agent init
Main: prepareAgent started
Main: prepareAgent finished

Main #A: method A() must be blocked on entering a synchronized statement
TestTask.run: started

Main #A.1: unsuspended
Main: stopThread: StopThread returned code: JVMTI_ERROR_THREAD_NOT_SUSPENDED (13)
Main #A.1: got expected THREAD_NOT_SUSPENDED

Main #A.2: suspended
Main: suspendThread
Main: stopThread: StopThread returned code: JVMTI_ERROR_NONE (0)
Timeout refired 480 times
----------System.err:(3/186)----------
java version "21-ea" 2023-09-19 LTS
Java(TM) SE Runtime Environment (fastdebug build 21-ea+23-LTS-1910)
Java HotSpot(TM) 64-Bit Server VM (fastdebug build 21-ea+23-LTS-1910, mixed mode)
----------rerun:(36/6757)*----------

<snip>

result: Error. Program `/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-21+23-1910/macosx-x64-debug.jdk/jdk-21/fastdebug/bin/java' timed out (timeout set to 480000ms, elapsed time including timeout handling was 543310ms).

This test was recently added by:

JDK-8306034 add support of virtual threads to JVMTI StopThread