The following test timed out in the JDK23 CI:

com/sun/jdi/InvokeHangTest.java

Here's a snippet from the log file:

#section:driver
----------messages:(10/321)----------
command: driver InvokeHangTest
reason: User specified action: run driver InvokeHangTest
started: Thu Jan 11 09:58:09 UTC 2024
Mode: agentvm
Agent id: 20
Timeout signalled after 480 seconds
Timeout information:
--- Timeout information end.
finished: Thu Jan 11 10:13:12 UTC 2024
elapsed time (seconds): 903.619
----------configuration:(14/1337)*----------

<snip>

----------System.out:(622/31584)*----------
vmOpts: '-Xmx768m -XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=c:\\ade\\mesos\\work_dir\\jib-master\\install\\jdk\\21\\35\\bundles\\windows-x64\\jdk-21_windows-x64_bin.zip\\jdk-21 -Djava.io.tmpdir=c:\\sb\\prod\\1704966906\\testoutput\\test-support\\jtreg_open_test_jdk_jdk_jdi\\tmp -XX:+CreateCoredumpOnCrash -ea -esa'
javaOpts: '-XX:+UseZGC'
JVM version:23-ea
JDI version: 23.0
JVM description: Java Debug Interface (Reference Implementation) version 23.0
Java Debug Wire Protocol (Reference Implementation) version 23.0
JVM Debug Interface version 23.0
JVM version 23-ea (Java HotSpot(TM) 64-Bit Server VM, mixed mode, sharing)
Howdy!
  Debugger: Breakpoint hit at InvokeHangTarg:105
  Debugger: Invoking in thread instance of java.lang.Thread(name='Thread 1', id=105)
Debuggee: invokeee in thread Thread[#34,Thread 1,5,main]
Debuggee: invokeee finished
  Debugger: Invoke done
Debuggee: Thread[#35,Thread 2,5,main] is running:1
Debuggee: Thread[#34,Thread 1,5,main] is running:1
  Debugger: Breakpoint hit at InvokeHangTarg:121
  Debugger: Invoking in thread instance of java.lang.Thread(name='Thread 2', id=110)
Debuggee: invokeee in thread Thread[#35,Thread 2,5,main]
Debuggee: invokeee finished
Debuggee: Thread[#34,Thread 1,5,main] is running:2
  Debugger: Invoke done
Debuggee: Thread[#35,Thread 2,5,main] is running:2
  Debugger: Breakpoint hit at InvokeHangTarg:105
  Debugger: Invoking in thread instance of java.lang.Thread(name='Thread 1', id=105)
Debuggee: Thread[#35,Thread 2,5,main] is running:3
Debuggee: invokeee in thread Thread[#34,Thread 1,5,main]
Debuggee: invokeee finished
  Debugger: Invoke done

<snip>

Debuggee: Thread[#35,Thread 2,5,main] is running:84
  Debugger: Breakpoint hit at InvokeHangTarg:105
  Debugger: Invoking in thread instance of java.lang.Thread(name='Thread 1', id=105)
Debuggee: Thread[#35,Thread 2,5,main] is running:85
Debuggee: invokeee in thread Thread[#34,Thread 1,5,main]
Debuggee: Thread[#35,Thread 2,5,main] is running:86
Debuggee: invokeee finished
  Debugger: Invoke done
Debuggee: Thread[#34,Thread 1,5,main] is running:86
  Debugger: Breakpoint hit at InvokeHangTarg:121
  Debugger: Invoking in thread instance of java.lang.Thread(name='Thread 2', id=110)
Debuggee: Thread[#34,Thread 1,5,main] is running:87
Debuggee: invokeee in thread Thread[#35,Thread 2,5,main]
Debuggee: invokeee finished
  Debugger: Invoke done
Debuggee: Thread[#35,Thread 2,5,main] is running:87
  Debugger: Breakpoint hit at InvokeHangTarg:105
  Debugger: Invoking in thread instance of java.lang.Thread(name='Thread 1', id=105)
bkpts = 88
bkpts = 88
result: Error. Agent error: java.lang.Exception: Agent 20 timed out with a timeout of 480 seconds; check console log for any additional details


There's another interesting unresolved bug for this test:

JDK-8218463 com/sun/jdi/InvokeHangTest.java fail "java.lang.Exception: InvokeHangTest: failed; bkpts = 64"