Updated packages have been posted for testing:

ftp://ftp.scientificlinux.org/linux/scientific/6rolling/testing/i386/
ftp://ftp.scientificlinux.org/linux/scientific/6rolling/testing/x86_64/

This update addresses a bug in the check_yum() function (DFCT0001262)
where the detection of hung yum processes failed to work as expected.

Unless any critial bugs are reported, this package will be published as
a bug fix on Jan 13, 2015

i386:
  yum-autoupdate-2-6.6.noarch.rpm

x86_64:
  yum-autoupdate-2-6.6.noarch.rpm

You can install this update for testing via the sl-testing repo on
your SL system:
   yum --enablerepo=sl-testing update <package you wish to test>