The following test timed out in the JDK20 CI:

jdk/jfr/event/gc/detailed/TestGCLockerEvent.java

Here's a snippet from the log file:

#section:main
----------messages:(7/558)----------
command: main -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx32m -Xms32m -Xmn12m -XX:+UseG1GC jdk.jfr.event.gc.detailed.TestGCLockerEvent
reason: User specified action: run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xmx32m -Xms32m -Xmn12m -XX:+UseG1GC jdk.jfr.event.gc.detailed.TestGCLockerEvent
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jfr,java.management
Timeout information:
--- Timeout information end.
elapsed time (seconds): 1437.668
----------configuration:(3/54)----------
Boot Layer
  add modules: jdk.jfr java.management

----------System.out:(1/28)----------
Timeout refired 1200 times
----------System.err:(0/0)----------
----------rerun:(50/5770)*----------

<snip>

result: Error. Program `c:\ade\mesos\work_dir\jib-master\install\jdk-20+9-471\windows-x64-debug.jdk\jdk-20\fastdebug\bin\java' timed out (timeout set to 1200000ms, elapsed time including timeout handling was 1437664ms).