strange log output

[Dave]

Hello,
    Can anyone tell me what these log outputs mean? I'm seeing them in my 
daily security log reports.
Thanks.
Dave.


+cmd mysqld pid 32880 tried to use non-present sched_yield
+cmd mysqld pid 32880 tried to use non-present sched_yield
+cmd cdrecord pid 26176 tried to use non-present sched_get_priority_max
+cmd cdrecord pid 26176 tried to use non-present sched_setscheduler
+cmd cdrecord pid 26177 tried to use non-present sched_get_priority_max
+cmd cdrecord pid 26177 tried to use non-present sched_setscheduler