<div class="__aliyun_email_body_block"><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;">The code below will dead lock</span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><span >-Djdk.virtualThreadScheduler.parallelism=1</span></span><div style="clear:both;">-Djdk.virtualThreadScheduler.maxPoolSize=1</div><div ><span >-Djdk.virtualThreadScheduler.minRunnable=1</span></div><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><span >public class VTTest {</span></span><div style="clear:both;"> static final CountDownLatch countDownLatch = new CountDownLatch(1);</div><div style="clear:both;"> static final ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor();</div><div style="clear:both;"> public static void main(String[] args) throws IOException {</div><div style="clear:both;"> executor.execute(() -> {</div><div style="clear:both;"> try {</div><div style="clear:both;"> Thread.sleep(1000);</div><div style="clear:both;"> } catch (InterruptedException e) {</div><div style="clear:both;"> throw new RuntimeException(e);</div><div style="clear:both;"> }</div><div style="clear:both;"> countDownLatch.countDown();</div><div style="clear:both;"> });</div><div style="clear:both;"> executor.execute(InnerSleepClass::hello);</div><div style="clear:both;"> System.in.read();</div><div style="clear:both;"> }</div><div style="clear:both;"> private static class InnerSleepClass {</div><div style="clear:both;"> static {</div><div style="clear:both;"> try {</div><div style="clear:both;"> countDownLatch.await();</div><div style="clear:both;"> System.out.println("exit count down.");</div><div style="clear:both;"> } catch (InterruptedException e) {</div><div style="clear:both;"> throw new RuntimeException(e);</div><div style="clear:both;"> }</div><div style="clear:both;"> }</div><div style="clear:both;"> static void hello() {</div><div style="clear:both;"> System.out.println("hello");</div><div style="clear:both;"> }</div><div style="clear:both;"> }</div><div ><span >}</span></div><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><blockquote style="margin-right:.0px;margin-top:.0px;margin-bottom:.0px;font-family:Tahoma,Arial,STHeiti,SimSun;font-size:14.0px;color:#000000;"><div style="clear:both;">------------------------------------------------------------------</div><div style="clear:both;">发件人：何品(虎鸣) <hepin.p@alibaba-inc.com></div><div style="clear:both;">发送时间：2024年6月23日(星期日) 16:30</div><div style="clear:both;">收件人：Alan Bateman<Alan.Bateman@oracle.com>; masoud parvari<masoud.parvari@gmail.com>; "何品(虎鸣)"<hepin.p@alibaba-inc.com></div><div style="clear:both;">抄 送："loom-dev"<loom-dev@openjdk.org></div><div style="clear:both;">主 题：回复：回复：Virtual thread hang and all threads stop running on JDK21</div><div style="clear:both;"><br ></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;">Thanks for the <span >clarification</span></span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><div style="clear:both;"><span style="font-family:Tahoma,Arial,STHeiti,SimSun;"><br ></span></div><div style="margin:14.0px 40.0px;"><div style="clear:both;">------------------------------------------------------------------</div><div style="clear:both;">发件人：Alan Bateman <Alan.Bateman@oracle.com></div><div style="clear:both;">发送时间：2024年6月22日(星期六) 17:22</div><div style="clear:both;">收件人：masoud parvari<masoud.parvari@gmail.com>; "何品(虎鸣)"<hepin.p@alibaba-inc.com></div><div style="clear:both;">抄 送："loom-dev"<loom-dev@openjdk.org></div><div style="clear:both;">主 题：Re: 回复：Virtual thread hang and all threads stop running on JDK21</div><div style="clear:both;"><br ></div>
On 22/06/2024 09:54, masoud parvari wrote:<br >
<div style="margin:14.0px 40.0px;">
<div >In class loading/initialization cases, the
underlying issue is that pinning happens because there are <span class="gmail-il">native</span> <span class="gmail-il">frames</span> in
the stack, so replacing the synchronized with a j.u.c lock will
still lead to the same issue.<br >
</div>
<br >
</div>
<br >
That's right, and there are a couple of scenarios there, to be
looked into after the object monitor issues are out of the way.<br >
<br >
-Alan<br >
</div></blockquote></div>