Public bug reported:

When runner qrunner with --runners=All it calls all defined runners in an endless loop[1]. Most of the time the runners have nothing to do and quickly reach the point where they shut down again[2]. Note that this happens before they sleep in self._snooze(), which is intended to prevent a busy-loop. After that, the runners get started again without delay, in an endless loop, eating up a CPU core.

As far as I know this should happen in any mailman2.1 setup when using qrunner with --runners=All.

[1]: https://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/bin/qrun... [2]: https://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/Mailman/...

** Affects: mailman Importance: Undecided Status: New