On Wed, 12 Jun 2024 08:45:46 GMT, Inigo Mediavilla Saiz <d...@openjdk.org> 
wrote:

>> Print the stack traces of mounted virtual threads when calling `jcmd <pid> 
>> Thread.print`.
>
> Inigo Mediavilla Saiz has updated the pull request incrementally with one 
> additional commit since the last revision:
> 
>   Remove unneeded line

It's the countDown by "dummy" thread will unpark "main". The queuing and 
starting of the second FJ worker thread is happening in the context of dummy's 
carrier (not dummy itself). We want to eventually remove these temporary 
transitions, at least for the default scheduler, but aren't there yet. I've 
attached an initial patch to JDK-8334215 for the issues.

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PR Comment: https://git.openjdk.org/jdk/pull/19482#issuecomment-2167374446

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