Seen in Github actions testing:

https://github.com/pchilano/jdk/runs/2876825042

STDOUT:
Loading Thread #1: Starting...
Loading Thread #1: ClassInLoader
Loading Thread #1: CP1.foo()
Loading Thread #1: loading A extends B
Loading Thread #1: t1 waits parallelCapable loader
Thread 1 was started...
MainThread: t2 waits
Timeout refired 480 times
STDERR:
rerun:
cd /Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/scratch/1 && \
HOME=/Users/runner \
JDK8_HOME=/Users/runner/bootjdk/16/Contents/Home \
JTREG_KEYWORDS=!headful \
JTREG_VERBOSE=fail,error,time \
LANG=en_US.UTF-8 \
LC_ALL=C \
LC_CTYPE=en_US.UTF-8 \
PATH=/bin:/usr/bin:/usr/sbin \
TEST_IMAGE_DIR=/Users/runner/jdk-macos-x64-debug/jdk-18-internal+0_macos-x64_bin-tests-debug \
CLASSPATH=/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/classes/0/runtime/ParallelLoad/ParallelSuperTest.d:/Users/runner/work/jdk/jdk/test/hotspot/jtreg/runtime/ParallelLoad:/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/classes/0/test/lib:/Users/runner/work/jdk/jdk/test/lib:/Users/runner/jtreg/lib/javatest.jar:/Users/runner/jtreg/lib/jtreg.jar \
    /Users/runner/jdk-macos-x64-debug/jdk-18-internal+0_macos-x64_bin-debug/jdk-18/fastdebug/bin/java \
        -Dtest.vm.opts='-XX:MaxRAMPercentage=12.5 -Djava.io.tmpdir=/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/tmp' \
        -Dtest.tool.vm.opts='-J-XX:MaxRAMPercentage=12.5 -J-Djava.io.tmpdir=/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/tmp' \
        -Dtest.compiler.opts= \
        -Dtest.java.opts=-XX:-CreateCoredumpOnCrash \
        -Dtest.jdk=/Users/runner/jdk-macos-x64-debug/jdk-18-internal+0_macos-x64_bin-debug/jdk-18/fastdebug \
        -Dcompile.jdk=/Users/runner/jdk-macos-x64-debug/jdk-18-internal+0_macos-x64_bin-debug/jdk-18/fastdebug \
        -Dtest.timeout.factor=4.0 \
        -Dtest.nativepath=/Users/runner/jdk-macos-x64-debug/jdk-18-internal+0_macos-x64_bin-tests-debug/hotspot/jtreg/native \
        -Dtest.root=/Users/runner/work/jdk/jdk/test/hotspot/jtreg \
        -Dtest.name=runtime/ParallelLoad/ParallelSuperTest.java \
        -Dtest.file=/Users/runner/work/jdk/jdk/test/hotspot/jtreg/runtime/ParallelLoad/ParallelSuperTest.java \
        -Dtest.src=/Users/runner/work/jdk/jdk/test/hotspot/jtreg/runtime/ParallelLoad \
        -Dtest.src.path=/Users/runner/work/jdk/jdk/test/hotspot/jtreg/runtime/ParallelLoad:/Users/runner/work/jdk/jdk/test/lib \
        -Dtest.classes=/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/classes/0/runtime/ParallelLoad/ParallelSuperTest.d \
        -Dtest.class.path=/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/classes/0/runtime/ParallelLoad/ParallelSuperTest.d:/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/classes/0/test/lib \
        -Dtest.class.path.prefix=/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/classes/0/runtime/ParallelLoad/ParallelSuperTest.d:/Users/runner/work/jdk/jdk/test/hotspot/jtreg/runtime/ParallelLoad:/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/classes/0/test/lib \
        -Dtest.modules='java.base/jdk.internal.org.objectweb.asm java.base/jdk.internal.misc' \
        --add-modules java.base \
        --add-exports java.base/jdk.internal.org.objectweb.asm=ALL-UNNAMED \
        --add-exports java.base/jdk.internal.misc=ALL-UNNAMED \
        -XX:MaxRAMPercentage=12.5 \
        -Djava.io.tmpdir=/Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/tmp \
        -XX:-CreateCoredumpOnCrash \
        -Djava.library.path=/Users/runner/jdk-macos-x64-debug/jdk-18-internal+0_macos-x64_bin-tests-debug/hotspot/jtreg/native \
        com.sun.javatest.regtest.agent.MainWrapper /Users/runner/work/jdk/jdk/build/run-test-prebuilt/test-support/jtreg_test_hotspot_jtreg_tier1_runtime/runtime/ParallelLoad/ParallelSuperTest.d/main.2.jta -parallel -parallelCapable

TEST RESULT: Error. Program `/Users/runner/jdk-macos-x64-debug/jdk-18-internal+0_macos-x64_bin-debug/jdk-18/fastdebug/bin/java' timed out (timeout set to 480000ms, elapsed time including timeout handling was 537247ms).