The following test timed out in the JDK16 CI:

compiler/graalunit/Core01Test.java

Here's a snippet from the log file:

#section:main
----------messages:(7/706)----------
command: main -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.graalunit.common.GraalUnitTestLauncher -prefix org.graalvm.compiler.core.test.[a-cA-C] -exclude ExcludeList.txt -vmargs --add-opens=java.base/java.lang=ALL-UNNAMED
reason: User specified action: run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.graalunit.common.GraalUnitTestLauncher -prefix org.graalvm.compiler.core.test.[a-cA-C] -exclude ExcludeList.txt -vmargs --add-opens=java.base/java.lang=ALL-UNNAMED
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.internal.vm.compiler
Timeout information:
--- Timeout information end.
elapsed time (seconds): 539.417
----------configuration:(3/55)----------
Boot Layer
  add modules: jdk.internal.vm.compiler

----------System.out:(311/73027)*----------
INFO: graal libs dir is 'c:/ade/mesos/work_dir/jib-master/install/jdk-16+7-228/windows-x64-open.test/hotspot/jtreg/graal'

<snip>

OK (179 tests)


10 longest running test classes:
    510,119 ms org.graalvm.compiler.core.test.CountedLoopTest
      5,062 ms org.graalvm.compiler.core.test.BciBlockMappingTest
      3,468 ms org.graalvm.compiler.core.test.ArrayCopyVirtualizationTest
      1,860 ms org.graalvm.compiler.core.test.ByteBufferTest
      1,656 ms org.graalvm.compiler.core.test.CommonedConstantsTest
      1,232 ms org.graalvm.compiler.core.test.ArrayLengthProviderTest
        778 ms org.graalvm.compiler.core.test.BoxingEliminationTest
        549 ms org.graalvm.compiler.core.test.ConcreteSubtypeTest
        325 ms org.graalvm.compiler.core.test.ConditionalNodeTest
        296 ms org.graalvm.compiler.core.test.ConditionTest
10 longest running tests:
     71,771 ms decrementUnsigned7(org.graalvm.compiler.core.test.CountedLoopTest)
     66,097 ms incrementUnsigned7(org.graalvm.compiler.core.test.CountedLoopTest)
     53,582 ms incrementEq7(org.graalvm.compiler.core.test.CountedLoopTest)
     48,573 ms increment7(org.graalvm.compiler.core.test.CountedLoopTest)
     39,564 ms decrement4(org.graalvm.compiler.core.test.CountedLoopTest)
     36,588 ms increment8(org.graalvm.compiler.core.test.CountedLoopTest)
     35,515 ms decrementEq5(org.graalvm.compiler.core.test.CountedLoopTest)
     30,278 ms incrementEq8(org.graalvm.compiler.core.test.CountedLoopTest)
     28,105 ms decrementUnsigned8(org.graalvm.compiler.core.test.CountedLoopTest)
     27,653 ms incrementUnsigned8a(org.graalvm.compiler.core.test.CountedLoopTest)

[2020-07-20T22:48:59.932568700Z] Waiting for completion for process 7592
[2020-07-20T22:48:59.977471700Z] Waiting for completion finished for process 7592
----------System.err:(1/16)----------
STATUS:Passed.
----------rerun:(42/6247)*----------

Since we have "STATUS:Passed." it looks like the test
managed to pass while the JTREG timeout handler
was running.

The test executed for:

elapsed time (seconds): 539.417

with a default timeout value of 120 seconds/2 minutes
and a default timeoutFactor of 4, the total timeout period
is 480 seconds/8 minutes. Perhaps this test needs a
slightly longer timeout value?

This test was recently refactor into two parts by:

    JDK-8242388 compiler/graalunit/CoreTest.java timed out