What is "Application pooled thread controlled alarm"?

When I shutdown IDEA, I sometimes get a dialog titled "Please wait for safe shutdown of periodical tasks" with a progress bar that's labelled "Application pooled thread controlled alarm". Does anyone know what that is?

Sometimes it takes several minutes for that dialog to close and finally allow IDEA to shut down. Nowadays, I just cancel it so I can reboot the thing faster. Doesn't seem to have any side effect so far.

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