Comment # 31 on bug 1228659 from Andrei Borzenkov

(In reply to Richard Brown from comment #28)
> 
> HYPOTHESIS - the dependencies of packages udev and the kernel are apparently
> wrong, with udev being installed AFTER the kernel when it should be BEFORE.
> 

No, they are not. What is wrong is systemd packaging. Either all components of
systemd that depend on libsystemd-shared-$VERSION.so must be updated together
with this library (i.e. - they must belong to the same package), or
libsystemd-shared-$VERSION.so has to be in a separate package which allows
concurrent installation of multiple versions, like every other shared library
used by multiple packages does.