PM96302: A deadlock can occur when starting and stopping containers.

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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



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Document information


More support for:

WebSphere eXtreme Scale

Software version:

860

Reference #:

PM96302

Modified date:

2013-09-13

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