APAR status
Closed as program error.
Error description
Catalog server deadlocks in placement. Deadlock detected !!! Thread "JoinPlacementAction" is waiting for: com/ibm/ws/objectgrid/server/catalog/placement/PlacementServiceI mpl which is owned by: Thread "WorkUnitTimer" which is waiting for: java/util/concurrent/locks/ReentrantReadWriteLock$NonfairSync which is owned by: Thread "JoinPlacementAction" "JoinPlacementAction" J9VMThread Blocked on: com/ibm/ws/objectgrid/server/catalog/placement/PlacementServiceI mpl Owned by: "WorkUnitTimer" Java callstack: at com/ibm/ws/objectgrid/server/catalog/placement/PlacementServiceI mpl.createGrid(PlacementServiceImpl.java:1535) at com/ibm/ws/objectgrid/server/catalog/placement/PlacementServiceI mpl.joinPlacementGroupInternal(PlacementServiceImpl.java:1338) at com/ibm/ws/objectgrid/server/catalog/placement/PlacementServiceI mpl$PlacementJoinAction.run(PlacementServiceImpl.java:446) at java/lang/Thread.run(Thread.java:780) "WorkUnitTimer" Parked on: java/util/concurrent/locks/ReentrantReadWriteLock$NonfairSync Owned by: "JoinPlacementAction" at sun/misc/Unsafe.park(Native Method) at java/util/concurrent/locks/LockSupport.park(LockSupport.java:197 (Compiled Code)) at java/util/concurrent/locks/AbstractQueuedSynchronizer.parkAndChe ckInterrupt(AbstractQueuedSynchronizer.java:845(Compiled Code)) at java/util/concurrent/locks/AbstractQueuedSynchronizer.acquireQue ued(AbstractQueuedSynchronizer.java:878(Compiled Code)) at java/util/concurrent/locks/AbstractQueuedSynchronizer.acquire(Ab stractQueuedSynchronizer.java:1208(Compiled Code)) at java/util/concurrent/locks/ReentrantReadWriteLock$WriteLock.lock (ReentrantReadWriteLock.java:956(Compiled Code)) at com/ibm/ws/objectgrid/locks/RWLock16.startWriting(RWLock16.java: 79(Compiled Code)) at com/ibm/ws/objectgrid/server/catalog/placement/PlacementServiceI mpl.moveReplicaToPreviousLocation(PlacementServiceImpl.java:2056 )
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere eXtreme Scale. * **************************************************************** * PROBLEM DESCRIPTION: A java threading deadlock occurs in * * the eXtreme Scale catalog server * * during placement operations. * **************************************************************** * RECOMMENDATION: * **************************************************************** When new placement operations are in progress at the same time as completion status reports are being processed from previous placement work, a deadlock occurs.
Problem conclusion
The deadlock was fixed and no longer occurs.
Temporary fix
Comments
APAR Information
APAR number
PM96302
Reported component name
WS EXTREME SCAL
Reported component ID
5724X6702
Reported release
860
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2013-09-03
Closed date
2013-09-13
Last modified date
2013-09-13
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
WS EXTREME SCAL
Fixed component ID
5724X6702
Applicable component levels
R860 PSY
UP
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSTVLU","label":"WebSphere eXtreme Scale"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"860","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
13 September 2013