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I sometimes have an rtkit-daemon process eating 100% of my CPU and making the system unresponsive. I reboot and things are fine after that. What is rtkit-daemon supposed to do and why would it be sometimes eating up 100% of my CPU?

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RealtimeKit is a D-Bus system service that changes the scheduling policy of user processes/threads to SCHED_RR (i.e. realtime scheduling mode) on request. It is intended to be used as a secure mechanism to allow real-time scheduling to be used by normal user processes. Overall, I would not expect it to peg out CPU usage. What happens if you let it run its course and do not reboot? I would be curious to know how long rtkit-daemon is active at any given instance.

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who comes up with these names rtkit-daemon could be easily interpreted as root kit daemon –  pt123 Jun 30 '13 at 23:13
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This is not an answer to the question "why would it be sometimes eating up 100% of my CPU?" and not a solution to the problem "making the system unresponsive". –  twigmac Mar 18 at 16:25
    
@twigmac Not even that. It merely explains what it should do, but not why it's randomly triggered and eats up 100% for several minutes once every few weeks. I've yet to find a pattern in it's behaviour. –  Hugo Jun 8 at 2:29

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