<div dir="ltr">According to <a href="https://openjdk.org/jeps/444">https://openjdk.org/jeps/444</a>,<br><br>"Unlike platform thread stacks, virtual thread stacks are not GC roots."<br><br>But jdk.internal.vm.ThreadContainers.RootContainer.TrackingRootContainer#VTHREADS keeps (hard) references to each virtual thread. Effectively, virtual threads are GC roots.<div><br></div><div>I described full example here: <a href="https://stackoverflow.com/questions/78596905/why-virtual-thread-is-not-garbage-collected-when-not-reachable">https://stackoverflow.com/questions/78596905/why-virtual-thread-is-not-garbage-collected-when-not-reachable</a><br><br>The problem was not visible since <a href="https://bugs.openjdk.org/browse/JDK-8309406">https://bugs.openjdk.org/browse/JDK-8309406</a>, because before the change, 

VTHREADS "keep" was not enabled and i guess nobody cares memory leak.<br><br>But after the change every JVM is affected.</div><div><br></div><div>A workaround for memory leak is set <span style="background-color:rgb(244,245,247);color:rgb(23,43,77);font-family:"DejaVu Sans",sans-serif;font-size:14px">jdk.trackAllThreads=false</span></div><div><br></div><div>Best regards</div><div>Michal Domagala<br><p style="margin:0px 0px 1.1em;padding:0px;border:0px;font-variant-numeric:inherit;font-variant-east-asian:inherit;font-variant-alternates:inherit;font-stretch:inherit;line-height:inherit;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI Adjusted","Segoe UI","Liberation Sans",sans-serif;font-kerning:inherit;font-feature-settings:inherit;font-size:15px;vertical-align:baseline;box-sizing:inherit;clear:both;color:rgb(12,13,14)"> </p></div></div>