dweiss opened a new issue, #14664:
URL: https://github.com/apache/lucene/issues/14664
### Description
It hangs in the 'restarter' thread on this condition:
```
while (startupThreads.size() > 0) {
Thread.sleep(10);
}
```
the main thread just joins the restarted and never ends.
The bug is easy to show if you add a sleep before startupThreads.add(t); it
is currently invoked after the sub-thread has been started - this means that it
is possible the sub-thread removes itself from the startupThreads list before
it's added to it, leaving the list in an inconsistent state (and never reach an
empty state).
### Version and environment details
_No response_
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