The following test timed out in the JDK17 CI:

java/util/ResourceBundle/Control/Bug6530694.java

Here's a snippet from the log file:

#section:main
----------messages:(7/314)----------
command: main -Djava.awt.headless=true Bug6530694
reason: User specified action: run main/othervm -Djava.awt.headless=true Bug6530694
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.desktop
Timeout information:
--- Timeout information end.
elapsed time (seconds): 1942.419
----------configuration:(3/40)----------
Boot Layer
  add modules: java.desktop

----------System.out:(1/27)----------
Timeout refired 1920 times
----------System.err:(1/146)----------
Java HotSpot(TM) 64-Bit Server VM warning: Option UseBiasedLocking was deprecated in version 15.0 and will likely be removed in a future release.
----------rerun:(49/6533)*----------

<snip>

result: Error. Program `/System/Volumes/Data/mesos/work_dir/jib-master/install/jdk-17+24-2082/macosx-x64-debug.jdk/jdk-17/fastdebug/bin/java' timed out (timeout set to 1920000ms, elapsed time including timeout handling was 1942415ms).

Please note that this test task is invoked with the following options:

-concurrency:6 -timeoutFactor:16

With a default timeout of 2 minutes/120 seconds and timeoutFactor
of 16, the total timeout value will be 32 minutes/1920 seconds.
So this test simply took too long for no obvious reason.

top output captured by the timeout handler:

----------------------------------------
[2021-05-22 05:42:45] [/usr/bin/top, -l, 1] timeout=20000
----------------------------------------
Processes: 390 total, 3 running, 12 stuck, 375 sleeping, 1698 threads
2021/05/22 05:42:46
Load Avg: 1.34, 1.35, 1.99
CPU usage: 9.77% user, 6.66% sys, 83.55% idle
SharedLibs: 1498M resident, 207M data, 544M linkedit.
MemRegions: 80795 total, 5151M resident, 162M private, 2124M shared.
PhysMem: 20G used (2656M wired), 12G unused.
VM: 2245G vsize, 2312M framework vsize, 0(0) swapins, 0(0) swapouts.
Networks: packets: 81069122/141G in, 69833015/125G out.
Disks: 8481045/104G read, 69856550/466G written.

shows the system is NOT very busy.