Can be easily reproduced:
TEST_VM_OPTS="-XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive" make CONF=linux-aarch64-server-fastdebug run-test TEST=com/sun/jdi/PopAsynchronousTest.java
TEST_VM_OPTS="-XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive" make CONF=linux-aarch64-server-fastdebug run-test TEST=com/sun/jdi/PopAsynchronousTest.java