IBM Support

PM34450: EXCESS MEMORY UTILIZATION ON THREADLOCAL IN XMLTYPEUTIL CAN CAUSE SERVANT REGION TO ABEND.

Fixes are available

7.0.0.19: WebSphere Application Server V7.0 Fix Pack 19
8.0.0.1: WebSphere Application Server V8.0 Fix Pack 1
7.0.0.21: WebSphere Application Server V7.0 Fix Pack 21
8.0.0.2: WebSphere Application Server V8.0 Fix Pack 2
8.0.0.3: WebSphere Application Server V8.0 Fix Pack 3
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
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
7.0.0.27: 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
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

  • The Eclipse class
    "org.eclipse.emf.ecore.xml.type.util.XMLTypeUtil"
    will see excess memory utilization in a thread local variable
    when XML data containing large character data sections is parsed
    This can lead to threads timing out due to heavy GC to clean up
    the heap consumed by these large ThreadLocal objects, and
    eventually cause Servants to abend with an EC3.
    

Local fix

  • na
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server V6.1.0 and V8.0                      *
    ****************************************************************
    * PROBLEM DESCRIPTION: Excess memory utilization will occur    *
    *                      on thread local  variable               *
    *                      org.eclipse.emf.ecore.xml.type.util.XML *
    *                      TypeUtil$CharArrayThreadLocal when      *
    *                      XML data containing large character     *
    *                      data sections (CDATA sections) is       *
    *                      parsed.  This can lead to threads       *
    *                      timing out due to heavy garbage         *
    *                      collection (GC) and eventually cause    *
    *                      Servants to abend with an EC3.          *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The problem occurs because the thread local variable
    org.eclipse.emf.ecore.xml.type.util.XMLTypeUtil$CharArrayThreadL
    ocal performs an allocation which is proportional to the size
    of the character data sections (CDATA sections) which are
    processed.  Because of how threads are managed, that leads to
    an effective permanent static allocation.
    

Problem conclusion

  • The problem was resolved by rewriting the XMLTypeUtil code to
    remove unnecessary allocations, including the removal of the
    thread local variable.
    
    APAR PM34450 is currently targeted for inclusion in Service
    Level (Fix Pack) 6.1.0.41 of WebSphere Application Server V6.1,
    and and Service Level (Fix Pack) 8.0.0.1 of WebSphere
    Application Server V8.0.
    
    For WebSphere Application Server V7.0 for z/OS this APAR will
    be documented as being delivered via it sysrouted APAR PM39993.
    
    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

    PM34450

  • 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

    2011-03-09

  • Closed date

    2011-05-24

  • Last modified date

    2011-12-02

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

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

    PM39993

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R610 PSY UK73054

       UP11/11/03 P F111

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 #: PM34450

Modified date: 02 December 2011