selenium: [🐛 Bug]: ExternalProcess produces a huge amount of excessive records which prevents to fetch/read CI logs

What happened?

We use SIGINT to kill Appium process created using process builder (e.g. graceful shutdown). This closes the process stdout, but the process remains alive for a while.

There is this code in the ExternalProcess:

        new Thread(
                () -> {
                  InputStream input = process.getInputStream();
                  // use the CircularOutputStream as mandatory, we know it will never raise a
                  // IOException
                  OutputStream output = new MultiOutputStream(circular, copyOutputTo);
                  while (process.isAlive()) {
                    try {
                      // we must read the output to ensure the process will not lock up
                      input.transferTo(output);
                    } catch (IOException ex) {
                      LOG.log(
                          Level.WARNING,
                          "failed to copy the output of process " + process.pid(),
                          ex);
                    }
                  }
                })
            .start();

As a result the above while loop spins for a few seconds thus producing a huge amount of warnings that significantly increase the overall log size, so it cannot be even fetched from the CI properly or read in the browser. A single record looks like:

Nov 04, 2023 8:10:01 AM org.openqa.selenium.os.ExternalProcess$Builder lambda$start$0
WARNING: failed to copy the output of process 63950
java.io.IOException: Stream closed
	at java.base/java.io.BufferedInputStream.getBufIfOpen(BufferedInputStream.java:168)
	at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:334)
	at java.base/java.io.InputStream.transferTo(InputStream.java:782)
	at org.openqa.selenium.os.ExternalProcess$Builder.lambda$start$0(ExternalProcess.java:209)
	at java.base/java.lang.Thread.run(Thread.java:833)

How can we reproduce the issue?

Run Appium Java client CI. Example: https://github.com/appium/java-client/actions/runs/6751224992/job/18359734036?pr=2067

Relevant log output

https://github.com/appium/java-client/actions/runs/6751224992/job/18359734036?pr=2067

Operating System

macos

Selenium version

4.15.2

What are the browser(s) and version(s) where you see this issue?

Appium

What are the browser driver(s) and version(s) where you see this issue?

Are you using Selenium Grid?

no