"Basil L. Contovounesios" <contovob@tcd.ie> writes:

> There's something about going through a complete create-join cycle more
> than once within a non-main-thread which is triggering this behaviour.

I'm not sure that it is related to threads. It looks, like some of your
processes do not exit properly, and then thread-join is blocked.

I've modified your example, again. It runs perfectly. And during its
work, you could call "M-x list-threads" and see how the threads are
created and die.

Best regards, Michael.