IBM Support

PM13589: CUSTOMER EXPERIENCE DEADLOCKS DURING SERVER STARTUP IN CLASSLOADER

Fixes are available

6.1.0.35: Java SDK 1.5 SR12 FP2 Cumulative Fix for WebSphere
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for AIX
7.0.0.15: Java SDK 1.6 SR9 Cumulative Fix for WebSphere Application Server
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for HP-UX
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for IBM i
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for Linux
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for Solaris
7.0.0.15: WebSphere Application Server V7.0 Fix Pack 15 for Windows
6.1.0.37: Java SDK 1.5 SR12 FP3 Cumulative Fix for WebSphere
7.0.0.17: WebSphere Application Server V7.0 Fix Pack 17
7.0.0.17: Java SDK 1.6 SR9 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.19: WebSphere Application Server V7.0 Fix Pack 19
7.0.0.21: WebSphere Application Server V7.0 Fix Pack 21
7.0.0.23: WebSphere Application Server V7.0 Fix Pack 23
7.0.0.25: WebSphere Application Server V7.0 Fix Pack 25
7.0.0.27: WebSphere Application Server V7.0 Fix Pack 27
7.0.0.29: WebSphere Application Server V7.0 Fix Pack 29
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
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
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
6.1.0.39: Java SDK 1.5 SR12 FP4 Cumulative Fix for WebSphere Application Server
6.1.0.41: Java SDK 1.5 SR12 FP5 Cumulative Fix for WebSphere Application Server
6.1.0.43: Java SDK 1.5 SR13 Cumulative Fix for WebSphere Application Server
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server
7.0.0.19: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.21: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere
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

  • Customer experience deadlocks during server startup in
    classloader.
    .
    In the JFORMAT ouput we saw the following..
    .
    dis os
    .
    deadlock
    .
    Thread 0x80934ed00
      has become hung on a deadlock between
      two (or more) other threads.
     It is trying to obtain a lock on object
      0x80ef5aa70 using monitor 0x80ef5aa70
    .
    Thread 0x80934ed00 has locks on the
    following objects:
    .
    Thread 0x809455500
      has become hung on a deadlock between two
      (or more) other threads.
      It is trying to obtain a lock on object
      0x8a05f25f8 using monitor 0x8a05f25f8
    .
    Thread 0x809455500 has locks on the
    following objects:
    .
    Thread 0x809454e00
     has become hung on a deadlock between two
     (or more) other threads.
     It is trying to obtain a lock on object
     0x8a05f25a8 using monitor 0x8a05f25a8
    .
    Thread 0x809454e00 has locks on the
      following objects:
      java/lang/Class@0x80ef5aa70
    .
    In the svcdump output there was the following message.
    .
    Function
    --------
    CEEOPCT
    pthread_cond_timedwait
    monitor_wait
    j9thread_monitor_wait_timed
    callMonitorWaitTimed
    Z_OBJECTMONITORENTERBLOCKING
    objectMonitorEnterBlocking
    SENDCLINIT
    SENDINITIALIZE
    Z_RESOLVECLASSREF
    resolveClassRef
    RUNJAVATHREAD
    javaProtectedThreadProc
    j9sig_protect
    javaThreadProc
    thread_wrapper
    CELQPCMM
    .
    Method
    ------
    com/ibm/ws/classloader/SinglePathClassProvider.openZipFile
    com/ibm/ws/classloader/SinglePathClassProvider.openZipFile
    com/ibm/ws/classloader/SinglePathClassProvider.access$200
    com/ibm/ws/classloader/SinglePathClassProvider$3.run
    com/ibm/ws/security/util/AccessController.doPrivileged
    com/ibm/ws/classloader/SinglePathClassProvider.getResource
    com/ibm/ws/classloader/CompoundClassLoader.findResources
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server V6.1.0                               *
    ****************************************************************
    * PROBLEM DESCRIPTION: A deadlock can occur when building      *
    *                      the contents of an application          *
    *                      class loader                            *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    An issue exists in the WebSphere Application Server in which
    two threads may attempt to access the cache of an application
    class loader's contents simultaneously, causing a deadlock
    situation
    

Problem conclusion

  • This APAR reduces the window of concurrency in order to avoid
    the deadlock situation.
    
    APAR PM13589 is currently targeted for inclusion in
    Service Level (Fix Pack) 6.1.0.35 of WebSphere Application
    Server V6.1.
    
    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

    PM13589

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-05-03

  • Closed date

    2010-09-10

  • Last modified date

    2011-01-03

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

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

    PM14707

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R610 PSY UK62676

       UP10/12/17 P F012

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: 6.1

Reference #: PM13589

Modified date: 03 January 2011