Hello Roman, > See: https://bugzilla.redhat.com/show_bug.cgi?id=1013708#c7 > > This is not caused by running the userland "perf" tool. Happens on a few of my > machines too, shortly after each reboot. I guess you don't check dmesg often > enough, probably on yours too. To be honest this message doesn't appear on my outdated host. Here we can see it in the output of `dmesg`, because I'm running live SystemRescueCD distro with the more modern kernel.