The following test failed in the JDK20 CI:

gc/g1/TestVerificationInConcurrentCycle.java#id1

Here's a snippet from the log file:

#section:script_messages
----------messages:(7/717)----------
JDK under test: /opt/mach5/mesos/work_dir/jib-master/install/jdk-20+6-301/linux-aarch64.jdk/jdk-20
java version "20-ea" 2023-03-21
Java(TM) SE Runtime Environment (build 20-ea+6-301)
Java HotSpot(TM) 64-Bit Server VM (build 20-ea+6-301, mixed mode, sharing)
Library /test/lib; kind: packages
   source directory: /opt/mach5/mesos/work_dir/jib-master/install/jdk-20+6-301/src.full/open/test/lib
   class directory: /opt/mach5/mesos/work_dir/slaves/0c72054a-24ab-4dbb-944f-97f9341a1b96-S10144/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/0224600a-a053-4a3a-860f-9033a276539a/runs/6c977ba8-79a1-4561-816a-385add23acfc/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_gc/classes/1/test/lib

#section:build
----------messages:(2/99)----------
command: build sun.hotspot.WhiteBox
reason: User specified action: run build sun.hotspot.WhiteBox
result: Not run. Test running...


test result: Error. can't find sun.hotspot.WhiteBox in test directory or libraries