misc test failures on macOS due to "Cannot get VM for test: java.net.SocketTimeoutException: Accept timed out"

This bug is currently about sightings of the following failure mode
on macosx-aarch64 and macosx-x64 machines only:

    Cannot get VM for test: java.net.SocketTimeoutException: Accept timed out

The windows-x64 version of this bug is here:

        JDK-8232179 misc test failures on windows-x64 due to "Cannot get VM for test: java.net.SocketTimeoutException: Accept timed out"


Below is the original sighting information:

The following test failed in the JDK20 CI:

java/time/test/java/util/TestFormatter.java

Here's a snippet from the log file:

#section:testng
----------messages:(4/175)----------
command: testng test.java.util.TestFormatter
reason: Assumed action based on file name: run testng test.java.util.TestFormatter
Mode: agentvm
elapsed time (seconds): 240.006
----------configuration:(0/0)----------
----------rerun:(28/7323)*----------

<snip>

result: Error. Cannot get VM for test: java.net.SocketTimeoutException: Accept timed out


The error msg is coming from JTREG itself and has nothing to
do with the test we're trying to execute. I'm starting this bug in
hotspot/runtime simply as a place to start tracking these strange
failures.