Hello all,
Recently I started to have several alarms like this:
Internal error detected: java.lang.Throwable:oracle.sysman.gcagent.tmmain.execution.LongOpManager$ZombieDetection:1017.
Or
Internal error detected: oracle.sysman.gcagent.task.TaskZombieException:oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask:620.
In agent log the message:
# $AGENT_INST/sysman/log/gcagent.log:
2017-06-13 12:54:09,232 [355:GC.Executor.14 (oracle_database:DB_DB12:%DB%)] ERROR - oracle_database:DB_DB12:%DB% oracle.sysman.gcagent.task.TaskZombieException: task declared as a zombie at oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask.accountedCall(TaskFutureImpl.java:620) at oracle.sysman.gcagent.task.TaskFutureImpl$WrappedTask.call(TaskFutureImpl.java:643) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138)
To avoid generating pages and new incidents, I changed parameter _zombieCreateIncident to false on agents in related servers, as per described in MOS EM12c: Incident constantly raised for Oracle.sysman.gcagent.task.TaskZombieException: task declared as a zombie (Doc ID 2116834.1) regarding MOS Bug 22674258 – Zombie processes created for DB metric collection /workaround do not work.
I also added some other parameters that should help, like increasing the wait, all mentioned in same MOS notes.
Like this, in $AGENT_INST/sysman/config/emd.properties:
#GrepOra magical fixes: _zombieSuspensions=true _canceledThreadWait=900 _zombieThreadPercentThreshold=0 _zombieCreateIncident=false
And it solved the issue. At leat, the noise stopped. 🙂
Hope it helps,
Cheers!
