puppetlabs/marionette-collective — pull request #127 by ploubser (2013-11-06 16:51:19+00:00)
Title: 23090 - Possible thread leak in Shell

In the past when Shell was called from a long running thread the guard
thread spawned by systemu would be blocked in a sleep forever.

This commit attempts to kill the guard thread after systemu has
finished.