The following test failed in the JDK21 CI:

vmTestbase/nsk/jdi/ExceptionEvent/_itself_/exevent008/TestDescription.java

Here's a snippet from the log file:

#section:main
----------messages:(6/1080)----------
command: main nsk.jdi.ExceptionEvent._itself_.exevent008 -verbose -arch=mac-x64 -waittime=5 -debugee.vmkind=java -transport.address=dynamic -debugee.vmkeys="-XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk/20/36/bundles/macos-x64/jdk-20_macos-x64_bin.tar.gz/jdk-20.jdk/Contents/Home -Djava.io.tmpdir=/System/Volumes/Data/mesos/work_dir/slaves/cd627e65-f015-4fb1-a1d2-b6c9b8127f98-S127009/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/8573e6af-779e-4d0c-9312-746d1c9f54db/runs/99db2830-cbe9-4460-8774-9704949dc665/testoutput/test-support/jtreg_open_test_hotspot_jtreg_vmTestbase_nsk_jdi/tmp -XX:+UseSerialGC -Xcomp"
reason: User specified action: run main/othervm nsk.jdi.ExceptionEvent._itself_.exevent008 -verbose -arch=${os.family}-${os.simpleArch} -waittime=5 -debugee.vmkind=java -transport.address=dynamic -debugee.vmkeys="${test.vm.opts} ${test.java.opts}"
started: Mon Aug 07 13:10:12 GMT 2023
Mode: othervm [/othervm specified]
finished: Mon Aug 07 13:16:07 GMT 2023
elapsed time (seconds): 354.587
----------configuration:(0/0)----------
----------System.out:(211/9133)*----------
binder> VirtualMachineManager: version 21.0
binder> Finding connector: default
binder> LaunchingConnector:
binder> name: com.sun.jdi.CommandLineLaunch
binder> description: Launches target using Sun Java VM command line and attaches to it
binder> transport: com.sun.tools.jdi.SunCommandLineLauncher$2@68233f61
binder> Connector arguments:
binder> main=nsk.jdi.ExceptionEvent._itself_.exevent008t \u0000-verbose\u0000 \u0000-arch=mac-x64\u0000 \u0000-waittime=5\u0000 \u0000-debugee.vmkind=java\u0000 \u0000-transport.address=dynamic\u0000 \u0000-debugee.vmkeys="-XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk/20/36/bundles/macos-x64/jdk-20_macos-x64_bin.tar.gz/jdk-20.jdk/Contents/Home -Djava.io.tmpdir=/System/Volumes/Data/mesos/work_dir/slaves/cd627e65-f015-4fb1-a1d2-b6c9b8127f98-S127009/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/8573e6af-779e-4d0c-9312-746d1c9f54db/runs/99db2830-cbe9-4460-8774-9704949dc665/testoutput/test-support/jtreg_open_test_hotspot_jtreg_vmTestbase_nsk_jdi/tmp -XX:+UseSerialGC -Xcomp"\u0000 \u0000-pipe.port=50998\u0000
binder> includevirtualthreads=y
binder> quote=\u0000
binder> home=/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-21+34-2497/macosx-x64-debug.jdk/jdk-21/fastdebug
binder> vmexec=java
binder> suspend=true
binder> options=-XX:MaxRAMPercentage=4.16667 -Dtest.boot.jdk=/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk/20/36/bundles/macos-x64/jdk-20_macos-x64_bin.tar.gz/jdk-20.jdk/Contents/Home -Djava.io.tmpdir=/System/Volumes/Data/mesos/work_dir/slaves/cd627e65-f015-4fb1-a1d2-b6c9b8127f98-S127009/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/8573e6af-779e-4d0c-9312-746d1c9f54db/runs/99db2830-cbe9-4460-8774-9704949dc665/testoutput/test-support/jtreg_open_test_hotspot_jtreg_vmTestbase_nsk_jdi/tmp -XX:+UseSerialGC -Xcomp
binder> Launching debugee
binder> Waiting for VM initialized
Initial VMStartEvent received: VMStartEvent in thread main
Resuming debuggee
IOPipe> Caught InterruptedIOException. Wait start time: 1691413860760, exception was thrown at: 1691414160966, wait time: 300206, actual timeout: 300000
# ERROR: IOPipe> Caught InterruptedIOException while listening for PipeIO Listener Thread connection at port 50998:
# ERROR: java.net.SocketTimeoutException: Accept timed out
The following stacktrace is for failure analysis.
nsk.share.TestFailure: IOPipe> Caught InterruptedIOException while listening for PipeIO Listener Thread connection at port 50998: java.net.SocketTimeoutException: Accept timed out
at nsk.share.Log.logExceptionForFailureAnalysis(Log.java:431)
at nsk.share.Log.complain(Log.java:402)
at nsk.share.Log$Logger.complain(Log.java:747)
at nsk.share.jpda.BasicSocketConnection.accept(SocketConnection.java:173)
at nsk.share.jpda.SocketConnection.accept(SocketConnection.java:453)
at nsk.share.jpda.SocketIOPipe$ListenerThread.run(SocketIOPipe.java:228)
# ERROR: binder> Debugee VM has not exited correctly: trying to kill it
The following stacktrace is for failure analysis.
nsk.share.TestFailure: binder> Debugee VM has not exited correctly: trying to kill it
at nsk.share.Log.logExceptionForFailureAnalysis(Log.java:431)
at nsk.share.Log.complain(Log.java:402)
at nsk.share.jpda.DebugeeProcess.complain(DebugeeProcess.java:458)
at nsk.share.jpda.DebugeeProcess.close(DebugeeProcess.java:438)
at nsk.share.jpda.DebugeeProcess.cleanup(DebugeeProcess.java:467)
at nsk.share.Finalizable.finalizeAtExit(Finalizable.java:50)
at nsk.share.Finalizer$FinalizerThread.run(Finalizer.java:122)
------------ Try to print debuggee threads before killing process ------------
Threads: [instance of java.lang.Thread(name='main', id=1), instance of java.lang.ref.Reference$ReferenceHandler(name='Reference Handler', id=698), instance of java.lang.ref.Finalizer$FinalizerThread(name='Finalizer', id=699), instance of java.lang.Thread(name='Signal Dispatcher', id=700), instance of java.lang.Thread(name='Notification Thread', id=701), instance of jdk.internal.misc.InnocuousThread(name='Common-Cleaner', id=29), instance of jdk.internal.misc.InnocuousThread(name='Cleaner-0', id=702), instance of jdk.internal.misc.InnocuousThread(name='Cleaner-1', id=703)]
Total threads: 8

Thread: main
Is suspended: false
Is at breakpoint: false

 suspend thread to get its stack

Stack frame count: 22
Frames:
sun.nio.ch.SocketDispatcher.read0, line: -1
sun.nio.ch.SocketDispatcher.read, line: 47
sun.nio.ch.NioSocketImpl.tryRead, line: 256
sun.nio.ch.NioSocketImpl.implRead, line: 307
sun.nio.ch.NioSocketImpl.read, line: 346
sun.nio.ch.NioSocketImpl$1.read, line: 796
java.net.Socket$SocketInputStream.read, line: 1099
java.io.ObjectInputStream$PeekInputStream.read, line: 2915
java.io.ObjectInputStream$PeekInputStream.readFully, line: 2931
java.io.ObjectInputStream$BlockDataInputStream.readShort, line: 3428
java.io.ObjectInputStream.readStreamHeader, line: 985
java.io.ObjectInputStream.<init>, line: 416
nsk.share.jpda.SocketConnection.makeSocketStreams, line: 639
nsk.share.jpda.BasicSocketConnection.onConnected, line: 350
nsk.share.jpda.SocketConnection.onConnected, line: 559
nsk.share.jpda.BasicSocketConnection.continueAttach, line: 278
nsk.share.jpda.SocketConnection.continueAttach, line: 453
nsk.share.jpda.SocketIOPipe.connect, line: 288
nsk.share.jpda.IOPipe.connect, line: 99
nsk.share.jpda.SocketIOPipe.println, line: 178
nsk.jdi.ExceptionEvent._itself_.exevent008t.communication, line: 80
nsk.jdi.ExceptionEvent._itself_.exevent008t.main, line: 41

 resume thread


Thread: Reference Handler
Is suspended: false
Is at breakpoint: false

 suspend thread to get its stack

Stack frame count: 3
Frames:
java.lang.ref.Reference.waitForReferencePendingList, line: -1
java.lang.ref.Reference.processPendingReferences, line: 246
java.lang.ref.Reference$ReferenceHandler.run, line: 208

 resume thread


Thread: Finalizer
Is suspended: false
Is at breakpoint: false

 suspend thread to get its stack

Stack frame count: 7
Frames:
java.lang.Object.wait0, line: -1
java.lang.Object.wait, line: 366
java.lang.Object.wait, line: 339
java.lang.ref.NativeReferenceQueue.await, line: 48
java.lang.ref.ReferenceQueue.remove0, line: 158
java.lang.ref.NativeReferenceQueue.remove, line: 89
java.lang.ref.Finalizer$FinalizerThread.run, line: 173

 resume thread


Thread: Signal Dispatcher
Is suspended: false
Is at breakpoint: false

 suspend thread to get its stack

Stack frame count: 0

 resume thread


Thread: Notification Thread
Is suspended: false
Is at breakpoint: false

 suspend thread to get its stack

Stack frame count: 0

 resume thread


Thread: Common-Cleaner
Is suspended: false
Is at breakpoint: false

 suspend thread to get its stack

Stack frame count: 10
Frames:
jdk.internal.misc.Unsafe.park, line: -1
java.util.concurrent.locks.LockSupport.parkNanos, line: 269
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await, line: 1847
java.lang.ref.ReferenceQueue.await, line: 71
java.lang.ref.ReferenceQueue.remove0, line: 143
java.lang.ref.ReferenceQueue.remove, line: 218
jdk.internal.ref.CleanerImpl.run, line: 140
java.lang.Thread.runWith, line: 1596
java.lang.Thread.run, line: 1583
jdk.internal.misc.InnocuousThread.run, line: 186

 resume thread


Thread: Cleaner-0
Is suspended: false
Is at breakpoint: false

 suspend thread to get its stack

Stack frame count: 10
Frames:
jdk.internal.misc.Unsafe.park, line: -1
java.util.concurrent.locks.LockSupport.parkNanos, line: 269
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await, line: 1847
java.lang.ref.ReferenceQueue.await, line: 71
java.lang.ref.ReferenceQueue.remove0, line: 143
java.lang.ref.ReferenceQueue.remove, line: 218
jdk.internal.ref.CleanerImpl.run, line: 140
java.lang.Thread.runWith, line: 1596
java.lang.Thread.run, line: 1583
jdk.internal.misc.InnocuousThread.run, line: 186

 resume thread


Thread: Cleaner-1
Is suspended: false
Is at breakpoint: false

 suspend thread to get its stack

Stack frame count: 10
Frames:
jdk.internal.misc.Unsafe.park, line: -1
java.util.concurrent.locks.LockSupport.parkNanos, line: 269
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await, line: 1847
java.lang.ref.ReferenceQueue.await, line: 71
java.lang.ref.ReferenceQueue.remove0, line: 143
java.lang.ref.ReferenceQueue.remove, line: 218
jdk.internal.ref.CleanerImpl.run, line: 140
java.lang.Thread.runWith, line: 1596
java.lang.Thread.run, line: 1583
jdk.internal.misc.InnocuousThread.run, line: 186

 resume thread

----------------------------------------------------------------------
binder> Killing debuggee by forcing target VM to exit
binder> Debugee VM successfully forced to exit
Killing debugee VM process


#>
#> SUMMARY: Following errors occured
#> during test execution:
#>
# ERROR: IOPipe> Caught InterruptedIOException while listening for PipeIO Listener Thread connection at port 50998:
# ERROR: java.net.SocketTimeoutException: Accept timed out
# ERROR: binder> Debugee VM has not exited correctly: trying to kill it
----------System.err:(9/633)----------
nsk.share.Failure: Connection for PipeIO Listener Thread at port 50998 wasn't accepted in 300000ms
at nsk.share.jpda.BasicSocketConnection.accept(SocketConnection.java:174)
at nsk.share.jpda.SocketConnection.accept(SocketConnection.java:453)
at nsk.share.jpda.SocketIOPipe$ListenerThread.run(SocketIOPipe.java:228)

JavaTest Message: Test threw exception: nsk.share.Failure: Connection for PipeIO Listener Thread at port 50998 wasn't accepted in 300000ms
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: nsk.share.Failure: Connection for PipeIO Listener Thread at port 50998 wasn't accepted in 300000ms
----------rerun:(36/8931)*----------


Near the end of the stdout log section is this sequence:

Stack frame count: 10
Frames:
jdk.internal.misc.Unsafe.park, line: -1
java.util.concurrent.locks.LockSupport.parkNanos, line: 269
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await, line: 1847
java.lang.ref.ReferenceQueue.await, line: 71
java.lang.ref.ReferenceQueue.remove0, line: 143
java.lang.ref.ReferenceQueue.remove, line: 218
jdk.internal.ref.CleanerImpl.run, line: 140
java.lang.Thread.runWith, line: 1596
java.lang.Thread.run, line: 1583
jdk.internal.misc.InnocuousThread.run, line: 186

 resume thread

----------------------------------------------------------------------
binder> Killing debuggee by forcing target VM to exit
binder> Debugee VM successfully forced to exit
Killing debugee VM process

I find myself wondering if the debugger ran off the end of the test
and that's why it was "Killing debuggee by forcing target VM to exit"
and the same time that the debugger thread was trying to exit.

Do we have a debugger/debuggee race here?

Also why would we be trying to open a new PipeIO at what is
probably the end of the test?