Appears specific to linux-aarch64-debug (tier3-gc_hotspot_runtime_-XX_+UseParallelGC-XX_+UseNUMA):

Numerous errors:

Following tests have failed: test_0, test_1, test_2, test_3, test_4, test_5, test_6, test_9, test_10, test_51, test_52, test_53, test_54, test_55,

This might be related to JDK-8347147, u2 AccessFlags ?

 stderr: [java.lang.IncompatibleClassChangeError: class PreloadCircularityTest$Class54a expects class PreloadCircularityTest$Class54b to be a value class but it is an identity class
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:471)
at java.base/java.lang.Class.forName(Class.java:462)

Issue appeared at the same time as JDK-8349630 (could be duplicate)
at PreloadCircularityTest$TestHelper.main(PreloadCircularityTest.java:443)