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13c Agents Generates Many DispatchingTaskSchedule alerts

We have the following issue introduced in 13c.

Bug 22684160 - Provide an option to disable duplicate task checking

Email notification:
Target type=Agent
Incident creation time=Jan 31, 2016 7:23:21 AM EST
Last updated time=Jan 31, 2016 7:23:43 AM EST
Message=Internal error detected: java.lang.Throwable:oracle.sysman.gcagent.task.scheduler.DispatchingTaskScheduler:1071.

When these alerts are triggered, incidents are generated under '[Agent_Instance_Home]/diag/ofm/emagent/emagent/incident/'

Stack observed from incident dump:

java.lang.Throwable: Duplicate Scheduled Tasks
at oracle.sysman.gcagent.tmmain.diag.DiagManager.createIncident(
at oracle.sysman.gcagent.task.scheduler.DispatchingTaskScheduler.checkForDuplicateScheduledTasks(
at oracle.sysman.gcagent.tmmain.lifecycle.TMComponentSvc$SystemMonitoring$
at java.util.concurrent.Executors$
at java.util.concurrent.FutureTask.runAndReset(
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(
at java.util.concurrent.ScheduledThreadPoolExecutor$
at java.util.concurrent.ThreadPoolExecutor.runWorker(
at java.util.concurrent.ThreadPoolExecutor$
at oracle.sysman.gcagent.util.system.GCAThread$

Many customers are hitting this issue after upgrade & with new install.

This issue is fixed now and patch is included in Agent May Bundle patch.

You can fix this case by applying the below patch:

Patch 23208577: EM-AGENT Bundle Patch

The following document was created for this issue,

EM 13c : Enterprise Manager 13c Cloud Control Agent Generates Many Alerts: oracle.sysman.gcagent.task.scheduler.DispatchingTaskSchedule (Doc ID 2108408.1)