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PI71530: WSLOGMANAGER DEADLOCK

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Deadlock detected in  [WorkManager.bpm-em-workmanager : 31]
    [WorkManager.bpm-em-workmanager : 25]  where
    
    WorkManager.bpm-em-workmanager : 25
    Owns Monitor Lock on
    com/ibm/rmi/util/Utility$RemoteToTieClassCache@0x000000010104FB5
    8 ,
    org/eclipse/core/runtime/adaptor/EclipseLog@0x0000000102434B10 ,
    com/ibm/wsspi/container/binding/sca/remote/EJSRemoteCSLDepartmen
    tAllocat
    ionHome_5cdf82f1@0x0000000195A33628
    Waiting for Monitor Lock on
    com/ibm/ws/bootstrap/WsLogManager@0x0000000101B8AFC8
    
    and
    
    WorkManager.bpm-em-workmanager : 31:
    Owns Monitor Lock on
    com/ibm/ws/bootstrap/WsLogManager@0x0000000101B8AFC8 ,
    com/ibm/ws/monitoring/policy/data/EventSourceImpl@0x0000000195A3
    B138
    Waiting for Monitor Lock on
    org/eclipse/core/runtime/adaptor/EclipseLog@0x0000000102434B10
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server.                                     *
    ****************************************************************
    * PROBLEM DESCRIPTION: A deadlock may occur on the             *
    *                      WsLogManager object between multiple    *
    *                      threads, when the WebSphere             *
    *                      Application Server and an application   *
    *                      are both logging at the same time.      *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    In the WsLogManager.getLogger() method, if the logger is null,
    a thread goes into a synchronized block to create a new
    instance of WsLogger object, thus locking the WsLogManager
    object. Meanwhile, another logging thread, will try to contend
    for the WsLogManager, causing a never-ending wait condition,
    leading to a deadlock.
    Below is the snippet of the stack trace, when the deadlock
    occurs on the WsLogManager object:
    Deadlock detected in  [WorkManager.bpm-em-workmanager : 31]
    [WorkManager.bpm-em-workmanager : 25]  where
    WorkManager.bpm-em-workmanager : 25
    Owns Monitor Lock on
    com/ibm/rmi/util/Utility$RemoteToTieClassCache@0x000000010104FB
    58 ,
    org/eclipse/core/runtime/adaptor/EclipseLog@0x0000000102434B10,
    com/ibm/wsspi/container/binding/sca/remote/EJSRemoteCSLDepartme
    ntAllocationHome_5cdf82f1@0x0000000195A33628
    Waiting for Monitor Lock on
    com/ibm/ws/bootstrap/WsLogManager@0x0000000101B8AFC8
    ...
    and
    WorkManager.bpm-em-workmanager : 31:
    Owns Monitor Lock on
    com/ibm/ws/bootstrap/WsLogManager@0x0000000101B8AFC8 ,
    com/ibm/ws/monitoring/policy/data/EventSourceImpl@0x00000001953
    B138
    Waiting for Monitor Lock on
    org/eclipse/core/runtime/adaptor/EclipseLog@0x0000000102434B10
    ...
    

Problem conclusion

  • To prevent the deadlock situation from happening, the code was
    re-structured, so the threads do not hold a lock on the
    WsLogManager object, when creating a new WsLogger object.
    
    The fix for this APAR is currently targeted for inclusion in
    fix packs 7.0.0.43, 8.0.0.14, 8.5.5.12, 9.0.0.3.  Please refer
    to the Recommended Updates page for delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI71530

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-10-31

  • Closed date

    2016-12-13

  • Last modified date

    2016-12-13

  • 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

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

Applicable component levels

  • R700 PSY

       UP

  • R800 PSY

       UP

  • R850 PSY

       UP

  • R900 PSY

       UP



Document information

More support for: WebSphere Application Server
General

Software version: 850

Reference #: PI71530

Modified date: 13 December 2016