A DESCRIPTION OF THE PROBLEM :
According to JEP 444, " if a virtual thread is blocked on, e.g., BlockingQueue.take(), and no other thread can obtain a reference to either the virtual thread or the queue, then the thread can be garbage collected — which is fine, since the virtual thread can never be interrupted or unblocked."

It does not work with default setting jdk.trackAllThreads=true, because virtual thread are stored in jdk.internal.vm.ThreadContainers.RootContainer.TrackingRootContainer#VTHREADS

The problem was not exist by default before in https://bugs.openjdk.org/browse/JDK-8302185 jdk.trackAllThreads was enabled by default


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Start example code and take heap dump

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Virtual thread is eligible for garbage collection
ACTUAL -
Virtual thread is accessible from GC root:

io.Demo$AAAConsumer 0x604610278 16 B
val$task of java.lang.VirtualThread$VThreadContinuation$1 0x604616bd8 40 B
target of java.lang.VirtualThread$VThreadContinuation 0x604616b38 120 B
cont of java.lang.VirtualThread 0x604616668 280 B
key of java.util.concurrent.ConcurrentHashMap$Node 0x604617200 32 B
java.util.concurrent.ConcurrentHashMap$Node[16] 0x6046171b0 112 B
table of java.util.concurrent.ConcurrentHashMap 0x604614828 176 B
map of java.util.concurrent.ConcurrentHashMap$KeySetView 0x604614810 200 B
VTHREADS of jdk.internal.vm.ThreadContainers$RootContainer$TrackingRootContainer, GC Root: Sticky class 0x604614770 312 B


---------- BEGIN SOURCE ----------
package io;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.TimeUnit;

public class Demo {

    public static void main(String[] args) throws InterruptedException {
        Thread.ofVirtual().start(new AAAConsumer());
        // here I catch thread/heap dump
        TimeUnit.SECONDS.sleep(15);
    }

    static class AAAConsumer implements Runnable {

        @Override
        public void run() {
            try {
                new ArrayBlockingQueue<>(100).take();
            } catch (InterruptedException e) {
                System.out.println("AAAConsumer interrupted");
            }
        }
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
-Djdk.trackAllThreads=false

FREQUENCY : always