The following test timed out in the JDK20 CI:

tools/jpackage/share/jdk/jpackage/tests/MainClassTest.java

Here's a snippet from the final sub-test that was running
when the test timed out:

[01:23:07.587] [ OK ] MainClassTest(modular=y; main-class=n; jar-main-class=n; jlink=y; error=Error: Main application class is missing).test; checks=4
[01:23:07.587] [ RUN ] MainClassTest(modular=y; main-class=n; jar-main-class=y; jlink=n).test
[01:23:07.588] TRACE: Create [/System/Volumes/Data/mesos/work_dir/slaves/91e16c40-06d4-468a-9fc3-7198a5bb7d5a-S73805/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/26e56b96-5b0a-4caa-b492-7e3752af19bb/runs/3b618499-9c2d-4322-8324-39221f055712/testoutput/test-support/jtreg_open_test_jdk_tier2_part2/scratch/4/test.13a4a2c7/src/module-info.java] text file...
[01:23:07.588] TRACE: module com.other {
[01:23:07.588] TRACE: exports test;
[01:23:07.588] TRACE: requires java.desktop;
[01:23:07.588] TRACE: }
[01:23:07.675] TRACE: Done
[01:23:07.844] TRACE: exec: Execute tool provider [javac -d ./test.13a4a2c7/jar-workdir ./test.13a4a2c7/src/test/Hello.java ./test.13a4a2c7/src/module-info.java](5)...
[01:23:08.216] TRACE: exec: Done. Exit code: 0
[01:23:08.216] TRACE: assertEquals(0): Check command tool provider [javac -d ./test.13a4a2c7/jar-workdir ./test.13a4a2c7/src/test/Hello.java ./test.13a4a2c7/src/module-info.java](5) exited with 0 code
[01:23:08.217] TRACE: exec: Execute tool provider [jar -c -f ./test.13a4a2c7/input-modules/hello.jar -e test.Hello -C ./test.13a4a2c7/jar-workdir .](9)...
[01:23:08.385] TRACE: exec: Done. Exit code: 0
[01:23:08.385] TRACE: assertEquals(0): Check command tool provider [jar -c -f ./test.13a4a2c7/input-modules/hello.jar -e test.Hello -C ./test.13a4a2c7/jar-workdir .](9) exited with 0 code
[01:23:08.386] TRACE: exec: Execute [/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-20+32-2319/macosx-x64.jdk/jdk-20.jdk/Contents/Home/bin/jpackage --dest ./test.13a4a2c7/output --name MainClassTest --type app-image --module-path ./test.13a4a2c7/input-modules --module com.other --runtime-image /System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-20+32-2319/macosx-x64.jdk/jdk-20.jdk/Contents/Home -J-Djlink.debug=true --verbose](15); inherit I/O...
----------System.err:(0/0)----------
----------rerun:(39/7672)*----------

<snip>

result: Error. Program `/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-20+32-2319/macosx-x64.jdk/jdk-20.jdk/Contents/Home/bin/java' timed out (timeout set to 2160000ms, elapsed time including timeout handling was 2351597ms).

The test's timeout value is 540 and with a default timeoutFactor of 4
the total timeout value is 2160 seconds/36 minutes. I think there are
32 sub-tests in this test so that's about a minute per test.