Please ignore my report, I have found that on my case the high cpu was a
consequence from bug:
https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/480564
** Changed in: ureadahead (Ubuntu)
Status: New => Invalid
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Endless logginf of messages " ureadahead-other main process (pid) terminated
with status 4"
https://bugs.launchpad.net/bugs/495917
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