The following nsk/monitoring tests are failing due to lack of ThreadInfo support for vthreads.

vmTestbase/nsk/monitoring/ThreadInfo/isInNative/isinnative001/TestDescription.java
vmTestbase/nsk/monitoring/ThreadInfo/getLockOwnerName/getlockownername001/TestDescription.java
vmTestbase/nsk/monitoring/ThreadInfo/getLockName/getlockname001/TestDescription.java
vmTestbase/nsk/monitoring/ThreadInfo/from_c/from_c001/TestDescription.java
vmTestbase/nsk/monitoring/MemoryUsage/from/from001/TestDescription.java

The following is for isinnative001:

java.lang.NullPointerException: Cannot invoke "java.lang.management.ThreadInfo.isInNative()" because "<local6>" is null
at nsk.monitoring.ThreadInfo.isInNative.isinnative001.run(isinnative001.java:40)
at nsk.monitoring.ThreadInfo.isInNative.isinnative001.main(isinnative001.java:32)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:142)
at java.base/java.lang.VirtualThread.run(VirtualThread.java:287)
at java.base/java.lang.VirtualThread$VThreadContinuation.lambda$new$0(VirtualThread.java:174)
at java.base/jdk.internal.vm.Continuation.enter0(Continuation.java:327)
at java.base/jdk.internal.vm.Continuation.enter(Continuation.java:320)

getlockownername001, getlockname001, and from_c001 look similar, but the method that throws the NPE varies depending on which ThreadInfo methods is being called.

The from001 failure is a bit differenct:

# ERROR: FAILURE 2.
The following stacktrace is for failure analysis.
nsk.share.TestFailure: FAILURE 2.
at nsk.share.Log.logExceptionForFailureAnalysis(Log.java:432)
at nsk.share.Log.complain(Log.java:403)
at nsk.monitoring.MemoryUsage.from.from001.run(from001.java:81)
at nsk.monitoring.MemoryUsage.from.from001.main(from001.java:38)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:578)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:142)
at java.base/java.lang.VirtualThread.run(VirtualThread.java:287)
at java.base/java.lang.VirtualThread$VThreadContinuation.lambda$new$0(VirtualThread.java:174)
at java.base/jdk.internal.vm.Continuation.enter0(Continuation.java:327)
at java.base/jdk.internal.vm.Continuation.enter(Continuation.java:320)
# ERROR: MemoryUsage.from(CompositeData) returned null, expected: IllegalArgumentException.
# ERROR: TEST FAILED

I think the issue is that ThreadMXBean.getThreadInfo() returns null for virtual threads. Here's the relevant code for the isinnative001 test:

        ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
        Thread thread = Thread.currentThread();
        long id = thread.getId();
        ThreadInfo info = mbean.getThreadInfo(id, Integer.MAX_VALUE);
        boolean isInNative = info.isInNative();

The test would need to be modified to expect a null ThreadInfo for virtual threads, but this essentially eliminates any real testing, so it really just shouldn't be run with the virtual thread wrapper.