IBM Support

PM75801: PLUG-IN DEADLOCK BETWEEN TRYING TO READ/LOAD A NEW PLUGIN CONFIGURATION AND STARTING AN ESI MONITOR THREAD TO A SERVER

Fixes are available

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
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
7.0.0.31: WebSphere Application Server V7.0 Fix Pack 31
7.0.0.33: 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
6.1.0.47: Java SDK 1.5 SR16 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

  • The plugin is in a mutex deadlock: one thread owns the
    configuration mutex and is waiting on the the esi mutex, and
    there is another thread that owns the esi mutex and is wating on
    the configuration mutex. All incoming requests will try to get
    the configuration mutex, so they will all get hung up.
    

Local fix

  • Turning the esi invalidator off bypasses the problem.
    <Property Name="ESIInvalidationMonitor" Value="false"/>
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Application Server webserver  *
    *                  plugin users                                *
    ****************************************************************
    * PROBLEM DESCRIPTION: Deadlock can occur when reloading       *
    *                      configuration and processing requests   *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    If there are frequent configuration changes such that the
    plugin configuration is being reload and requests are being
    processed, a deadlock situation can occur where the processing
    request and the reload are both waiting for a semaphore. This
    will only occur if ESI caching is enabled.
    

Problem conclusion

  • Change has been made to avoid the deadlock situation. If you
    are disabling ESI caching, it is recommended to stop and
    restart the webserver instead of a dynamic reload.
    
    APAR PM75801 is currently targeted for inclusion in
    Fick Packs 7.0.0.29, 8.0.0.6 and 8.5.5 of WebSphere
    Application Server.
    
    The fix will also be delivered as sysrouted APAR PM81813 in
    WebSphere Application Server V6.1 Fix Pack 6.1.0.47 for z/OS.
    
    Please refer to URL:
    //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
    for Fix Pack availability.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM75801

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-10-24

  • Closed date

    2013-01-04

  • Last modified date

    2013-07-03

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    PM80013 PM81813

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R700 PSY UK94926

       UP13/06/20 P F306

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.



Document information

More support for: WebSphere Application Server for z/OS
General

Software version: 7.0

Reference #: PM75801

Modified date: 03 July 2013