There is a new option to cyclictest to detect smis, that needs to read the msr and cpuid registers. Bugzilla 1341783 creates a udev rule to give the group "realtime" access to these registers, but this isn't sufficient. Programs that require the access need the cap_sys_rawio capability
Fixed in rt-tests-1.0-3 and up
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.