[GitHub] [mina-sshd] tomaswolf opened a new issue, #409: SshServer shutdown on Windows may report exceptions about already shut down ExecutorService

[via GitHub]

tomaswolf opened a new issue, #409:
URL: https://github.com/apache/mina-sshd/issues/409

   ### Version
   
   2.10.0
   
   ### Bug description
   
   From the [mailing 
list](https://www.mail-archive.com/users@mina.apache.org/msg07002.html):
   
   Attached code causes circa 50 exceptions:
   ```
   public static void main(String[] args) throws Exception {
   
       for (int i = 0; i < 100; i++) {
           SshServer sshd = SshServer.setUpDefaultServer();
           SimpleGeneratorHostKeyProvider hostKeyProvider = new 
SimpleGeneratorHostKeyProvider(
               Paths.get(".", "cert"));
           hostKeyProvider.setAlgorithm(KeyUtils.RSA_ALGORITHM);
   
           sshd.setKeyPairProvider(hostKeyProvider);
           sshd.start();
           sshd.stop(false);
       }
   }
   ```
   
   
   ### Actual behavior
   
   Lots of exceptions about an already shut down ExecutorService are logged.
   
   This occurs on Windows only; it's not reproducible on Linux.
   
   ### Expected behavior
   
   No exceptions are logged; the server shuts down cleanly.
   
   ### Relevant log output
   
   ```Shell
   Exception in thread "Thread-3" Exception in thread "Thread-2"
   java.lang.IllegalStateException: Executor has been shut down
           at
   
org.apache.sshd.common.util.ValidateUtils.createFormattedException(ValidateUtils.java:213)
           at
   
org.apache.sshd.common.util.ValidateUtils.throwIllegalStateException(ValidateUtils.java:207)
           at
   org.apache.sshd.common.util.ValidateUtils.checkState(ValidateUtils.java:184)
           at
   
org.apache.sshd.common.util.threads.NoCloseExecutor.execute(NoCloseExecutor.java:100)
           at
   
java.base/sun.nio.ch.AsynchronousChannelGroupImpl.executeOnPooledThread(AsynchronousChannelGroupImpl.java:190)
           at java.base/sun.nio.ch.Invoker.invokeIndirectly(Invoker.java:215)
           at java.base/sun.nio.ch.Invoker.invokeIndirectly(Invoker.java:316)
           at
   
java.base/sun.nio.ch.WindowsAsynchronousServerSocketChannelImpl$AcceptTask.failed(WindowsAsynchronousServerSocketChannelImpl.java:288)
           at java.base/sun.nio.ch.Iocp$EventHandlerTask.run(Iocp.java:389)
           at java.base/java.lang.Thread.run(Thread.java:1589)
   ```
   
   
   ### Other information
   
   OS: Windows
   
   Originally reported using temurin 19.0.2.7 and Apache MINA sshd 2.10.0, but 
it also occurs with other JVMs/JDKs.


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