On 21/11/2025 18:25, Fredriksson, Christian wrote:
Thank you.
Unfortunately I've been unable to reproduce it locally outside of our
runtime environment, but I do have a reliable reproducer there.
Would it help if I test this also with JDK 24/23/22?
Otherwise I can wait until JDK-8370887 is fixed (next release of JDK
25?) and test again then.
If you can see if it reproduces with JDK 24 then it would narrow this
down. It would also be useful to capture the output from running `jcmd
<pid> Thread.vthread_scheduler` a few times while it executes as this
includes info on delayed tasks.
It's possible it is related to JDK-8370887 but if all the sleeps are
sleep(1) and there is no interrupt/cancellation then there may not be
replacing going on to observe that issue. It may of course be that the
picture is more complicated. In any case, expect a JDK 26 EA build soon
with a fix to that issue.
You mentioned it reproduces in a single CPU environment. It's possible
that is relevant although your message said you also test with
jdk.virtualThreadScheduler.parallelism set so that might rule it out.
-Alan
