serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorVMEventsTest.java failing in loom repo

serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorVMEventsTest.java#id0
serviceability/jvmti/HeapMonitor/MyPackage/HeapMonitorVMEventsTest.java#id1
fail consistently in tier7 with:

#section:main
----------messages:(4/425)----------
command: main --enable-preview -XX:+UnlockDiagnosticVMOptions -XX:DisableIntrinsic=_clone -agentlib:HeapMonitorTest MyPackage.HeapMonitorVMEventsTest platform
reason: User specified action: run main/othervm/native --enable-preview -XX:+UnlockDiagnosticVMOptions -XX:DisableIntrinsic=_clone -agentlib:HeapMonitorTest MyPackage.HeapMonitorVMEventsTest platform
Mode: othervm [/othervm specified]
elapsed time (seconds): 0.903
----------configuration:(0/0)----------
----------System.out:(0/0)----------
----------System.err:(12/727)----------
java.lang.RuntimeException: Could not set the sampler
at MyPackage.HeapMonitor.sampleEverything(HeapMonitor.java:194)
at MyPackage.HeapMonitorVMEventsTest.main(HeapMonitorVMEventsTest.java:116)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:1494)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Could not set the sampler
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Could not set the sampler