ISC reader Joel B wrote in with these two links illustrating a couple of the hiccups that people may be experiencing with the recent leap second (on the 30th of June) that happened.  Please take a look at these two articles if you think you may be affected:

https://lkml.org/lkml/2012/6/30/122

access.redhat.com/knowledge/articles/15145

-- Joel Esler | http://blog.joelesler.net | http://twitter.com/joelesler