The following test timed out in the JDK16 CI:

javax/swing/JInternalFrame/6647340/bug6647340.java

Here's a snippet from the log file:

#section:main
----------messages:(7/234)----------
command: main bug6647340
reason: User specified action: run main bug6647340
Mode: othervm
Additional options from @modules: --add-modules java.desktop
Timeout information:
--- Timeout information end.
elapsed time (seconds): 252.045
----------configuration:(3/40)----------
Boot Layer
  add modules: java.desktop

----------System.out:(1/26)----------
Timeout refired 240 times
----------System.err:(0/0)----------
----------rerun:(41/6381)*----------
<snip>

result: Error. Program `/Volumes/HD2/mesos/work_dir/jib-master/install/jdk-16+23-1358/macosx-x64.jdk/jdk-16.jdk/Contents/Home/bin/java' timed out (timeout set to 240000ms, elapsed time including timeout handling was 252030ms).