<div dir="ltr"><div dir="ltr">Hi Alan,<br><br>Attaching the thread dump when the issue occurs (as a txt file)<br><br>It might be useful</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, 21 Jul 2024 at 12:41, Yuval Lombard <<a href="mailto:yuval.l@securithings.com">yuval.l@securithings.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi Alan<br><br>Thanks for replying!<br><br>When the issue occurs the Log you mentioned is not being printed - it is as if (or maybe it is even what is really happening) the virtual thread is not being scheduled (by its internal scheduler)<br>I to a thread dump by executing "kill -3 <pid>" and did not see the VT, will 

`java <pid> Thread.dump_to_file <file>` produce a more detailed view of the living threads?<br><br>I will try to run the later EA build</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, 21 Jul 2024 at 11:14, Alan Bateman <<a href="mailto:Alan.Bateman@oracle.com" target="_blank">Alan.Bateman@oracle.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 21/07/2024 08:05, Yuval Lombard wrote:<br>
> Hey team<br>
><br>
> We are experiencing some weird halting issues when scheduling tasks <br>
> with ScheduledExecutorService and VT.<br>
><br>
> We are observing some near deadlock issues / halting of executors <br>
> which we are not able to reproduce when using platform threads<br>
><br>
> This is one example of a near deadlock situation, where for some <br>
> reason virtual threads are starting to execute a task, and not <br>
> reaching the finally block nor the catch Throwable block to release <br>
> the acquired semaphore permit, reaching to drained semaphore.<br>
<br>
<br>
Is "Scheduling .. task for device" logged? Did you take thread dump with <br>
`java <pid> Thread.dump_to_file <file>` and try to identify the virtual <br>
thread?<br>
<br>
One of the later mails mentions 23-loom+4-102 and not seeing JFR events. <br>
Can you re-run with the latest EA build (currently 24-loom+2-24) as that <br>
has changes for the JFR events that may provide some insight here.<br>
<br>
-Alan<br>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div style="font-size:12.8px"><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial">Kind regards,<b style="font-size:13.3333px;color:rgb(0,176,240);font-family:Ebrima"><br><br>Yuval Lombard</b><br></p><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial"><font color="#3b3838" face="Ebrima"><span style="font-size:12px"><b>Lead Software Engineer</b></span></font></p><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial"><span style="font-size:9pt;font-family:Ebrima;color:rgb(59,56,56)">+972.50.548.0111</span><span style="font-size:9pt;font-family:Ebrima;color:rgb(64,64,64)"><u></u><u></u></span></p><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial"><font color="#0000ff" face="Ebrima"><span style="font-size:12px"><a href="mailto:yuval.l@securithings.com" style="color:rgb(17,85,204)" target="_blank">yuval.l@securithings.com</a></span></font></p><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial"><img src="cid:ii_l13cyhga0" alt="logo_black.png" width="200" height="47"></p></div></div></div></div>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div style="font-size:12.8px"><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial">Kind regards,<b style="font-size:13.3333px;color:rgb(0,176,240);font-family:Ebrima"><br><br>Yuval Lombard</b><br></p><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial"><font color="#3b3838" face="Ebrima"><span style="font-size:12px"><b>Lead Software Engineer</b></span></font></p><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial"><span style="font-size:9pt;font-family:Ebrima;color:rgb(59,56,56)">+972.50.548.0111</span><span style="font-size:9pt;font-family:Ebrima;color:rgb(64,64,64)"><u></u><u></u></span></p><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial"><font color="#0000ff" face="Ebrima"><span style="font-size:12px"><a href="mailto:yuval.l@securithings.com" style="color:rgb(17,85,204)" target="_blank">yuval.l@securithings.com</a></span></font></p><p class="MsoNormal" style="color:rgb(34,34,34);font-size:small;background-image:initial;background-position:initial;background-repeat:initial"><img src="cid:ii_l13cyhga0" alt="logo_black.png" width="200" height="47"></p></div></div></div></div>