For those not on IRC, I have identified the last remaining F18 blocker.
You can read the gory details on my G+ and I'll write a blog, but
briefly the summary is that systemd-logind is used to manage user
sessions. It talks over D-BUS (what doesn't these days) and is
collaborating with a custom systemd pam plugin which runs during session
setup. During a pkexec (polkit1) invocation of a binary, a call is made
to systemd-logind to setup a new session, which it does. But when it
does this, on systems without CONFIG_AUDITSYSCALL enabled, it cannot
see /proc/pid/sessionid, and decides that this means there cannot be an
existing session (the one you used to invoke pkexec).
When a new session is created, systemd opens a special fifo for the
session and registers to poll on this so that it can see if the session
died mysterously and needs cleaning up. In the case of a sudo-like
command, it needs to clean this fifo up ahead of time so that it won't
later (right as the new processing being driven by pkexec is spawned)
kill what you just tried to run. But if you do not have auditing setup,
systemd will never do any of these things and its "login manager" will
kill whatever you are trying to run with a SIGTERM. That's why you see
those "Terminated" messages and errors when trying to run e.g. yumex.
I'll write this up using better and more accurate language. I just
wanted to throw something out there to say that we know what the problem
is and that a fixed kernel package will be built soon.
 see the FreeDesktop docs on heads and sessions, also see loginctl.
 This is set in the base config but is not inherited on all of the
3.6 kernel variants, and a similar though slightly different situation
exists on 3.7. Peter is fixing the kernel config with a new 3.6 kernel.
Summary of discussion from #fedora-arm
Dennis Gilmore will be creating a kernel-dtb subpackage for the 3.7 kernel,
using 'make dtb' during the kernel build.
The plan is to pull in the 3.7 dtb's into our 3.6 based F18 RC1 release. We will
only be including the DTB's where needed, for Trimslice and vexpress which do not
boot without a DTB. The Pandaboard will boot the 3.7 without use of a DTB, and Highbank
provides it's own.
For a full summary of the testing: