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InnoDB semaphores resulted in extra CPU load

DenisMDenisM ContributorCurrent User Role Beginner
Hi!
As you can see on picture below, at about 5:00, Sunday, July 1, CPU load raised up to 7% with no known reason. It's slave server, and master faced same problem at same time.
The only visible correlation are InnoDB Semaphores.
But what is the reason?

CentOS Linux release 6.0
2.6.32-71.29.1.el6.x86_64
Percona-Server-server-55-5.5.16-rel22.0.189.rhel6.x86_64

Sorry for long picture.
0_851dc_980423b6_orig

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