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PM51209: DEADLOCK CONDITION EXISTS IN DYNACACHE

Fixes are available

7.0.0.23: WebSphere Application Server V7.0 Fix Pack 23
8.0.0.4: WebSphere Application Server V8.0 Fix Pack 4
7.0.0.25: WebSphere Application Server V7.0 Fix Pack 25
8.0.0.5: WebSphere Application Server V8.0 Fix Pack 5
7.0.0.27: WebSphere Application Server V7.0 Fix Pack 27
8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6
7.0.0.29: WebSphere Application Server V7.0 Fix Pack 29
8.0.0.7: WebSphere Application Server V8.0 Fix Pack 7
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
7.0.0.31: WebSphere Application Server V7.0 Fix Pack 31
7.0.0.27: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.33: WebSphere Application Server V7.0 Fix Pack 33
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
7.0.0.23: Java SDK 1.6 SR10 FP1 Cumulative Fix for WebSphere
7.0.0.25: Java SDK 1.6 SR11 Cumulative Fix for WebSphere Application Server
7.0.0.27: Java SDK 1.6 SR12 Cumulative Fix for WebSphere Application Server
7.0.0.29: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.31: Java SDK 1.6 SR15 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server

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APAR status

  • Closed as program error.

Error description

  • 7.0.0.17, Dynacache Deadlock.
    
    1LKDEADLOCK    Deadlock detected !!!
    
    NULL           ---------------------
    NULL
    2LKDEADLOCKTHR  Thread "DRSThreadPool : DMN0" (0x36AB8000)
    3LKDEADLOCKWTR    is waiting for:
    4LKDEADLOCKMON      sys_mon_t:0x3F2A7520 infl_mon_t: 0x3F2A7540:
    4LKDEADLOCKOBJ
    com/ibm/ws/cache/CacheEntry@0x80A2D590/0x80A2D59C:
    3LKDEADLOCKOWN    which is owned by:
    2LKDEADLOCKTHR  Thread "WebContainer : 1522" (0x3E90A500)
    3LKDEADLOCKWTR    which is waiting for:
    4LKDEADLOCKMON      sys_mon_t:0x3B923BA0 infl_mon_t: 0x3B923BC0:
    4LKDEADLOCKOBJ
    com/ibm/ws/cache/Cache@0x7E1C8370/0x7E1C837C:
    3LKDEADLOCKOWN    which is owned by:
    2LKDEADLOCKTHR  Thread "DRSThreadPool : DMN0" (0x36AB8000)
    

Local fix

  • disable cache memory size in MB
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server using dynacache with the memory      *
    *                  cache size in megabytes limit.              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Synchronization to protect the memory   *
    *                      cache size counter allowed a deadlock   *
    *                      condition to exist.                     *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The dynacache service provides the ability to limit the size
    of the cache in terms of JVM heap.  A deadlock may occur in
    some circumstances because of excessive synchronization.
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    PM51209

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-10-31

  • Closed date

    2012-01-17

  • Last modified date

    2012-01-17

  • 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

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

Applicable component levels

  • R700 PSY

       UP

  • R800 PSY

       UP



Document information

More support for: WebSphere Application Server
General

Software version: 7.0

Reference #: PM51209

Modified date: 17 January 2012