The following test timed out in the JDK16 CI:

jdk/incubator/vector/AddTest.java

Here's a snippet from the log file:

#section:main
----------messages:(7/276)----------
command: main AddTest
reason: Assumed action based on file name: run main AddTest
Mode: othervm [test needs --add-modules]
Additional options from @modules: --add-modules jdk.incubator.vector
Timeout information:
--- Timeout information end.
elapsed time (seconds): 1227.578
----------configuration:(3/48)----------
Boot Layer
  add modules: jdk.incubator.vector

----------System.out:(1/27)----------
Timeout refired 1200 times
----------System.err:(1/55)----------
WARNING: Using incubator modules: jdk.incubator.vector
----------rerun:(49/6050)*----------

I'm starting this bug off in hotspot/compiler because that's the
cat/subcat for: JDK-8223347 Integration of Vector API (Incubator)