EM 12c: Enterprise Manager 12c Cloud Control emctl start agent Creates Inventory Lock writer.lock on Inventory (Doc ID 2139650.1)

Last updated on NOVEMBER 15, 2019

Applies to:

Symptoms

Enterprise Manager (EM) 12.1.0.1 Cloud Control

$AGENT_INST/bin/emctl start agent

Command creates a inventory lock 'writer.lock' on inventory. It is retained and not removed during EM agent start.
This ‘lock’ is interfering to users daily clones thus causing impacts to user inventory related operation.

From /orainventory/locks/write.lock

2016-05-08_11-22-09-PM
java.lang.Throwable
at oracle.sysman.oii.oiit.OiitLockHeartbeat.writeStackTrace(OiitLockHeartbeat.java:186)
at oracle.sysman.oii.oiit.OiitLockHeartbeat.<init>(OiitLockHeartbeat.java:171)
at oracle.sysman.oii.oiit.OiitTargetLocker.getWriterLock(OiitTargetLocker.java:280)
at oracle.sysman.oii.oiit.OiitTargetLocker.getWriterLock(OiitTargetLocker.java:185)
at oracle.sysman.oii.oiit.OiitTargetLocker.getWriterLock(OiitTargetLocker.java:172)
at oracle.sysman.oii.oiic.OiicStandardInventorySession.acquireLocks(OiicStandardInventorySession.java:403)
at oracle.sysman.oii.oiic.OiicStandardInventorySession.initSession(OiicStandardInventorySession.java:301)
at oracle.sysman.oii.oiic.OiicStandardInventorySession.initSession(OiicStandardInventorySession.java:231)
at oracle.sysman.oii.oiic.OiicStandardInventorySession.initSession(OiicStandardInventorySession.java:180)
at oracle.opatch.OUIInventorySession.initSession(OUIInventorySession.java:60)
at oracle.opatch.OUISessionManager.setupSession(OUISessionManager.java:144)
at oracle.opatch.OUISessionManager.lockCentralInventory(OUISessionManager.java:215)
at oracle.opatch.OUISessionManager.instantiate(OUISessionManager.java:90)
at oracle.opatch.OUISessionManager.getOUIInventorySession(OUISessionManager.java:480)
at oracle.opatch.InventorySessionManager.getInventorySession(InventorySessionManager.java:43)
at oracle.opatch.Locker.lock(Locker.java:327)
at oracle.opatch.OracleHomeInventory.lock(OracleHomeInventory.java:2028)
at oracle.opatch.OracleHomeInventory.createInventoryObj(OracleHomeInventory.java:2183)
at oracle.opatch.OracleHomeInventory.getInstance(OracleHomeInventory.java:929)
at oracle.opatch.GenericInventory.createInstance(GenericInventory.java:42)
at oracle.opatch.OPatchSessionHelper.getOHProductFamily(OPatchSessionHelper.java:6733)
at oracle.opatch.CmdLineParser.parse(CmdLineParser.java:1663)
at oracle.opatch.OPatchSession.main(OPatchSession.java:1221)
at oracle.opatch.OPatch.main(OPatch.java:666)

Cause

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