IBM Support

IT17234: MQ hangs, reports failures from MQCONN, and memory exceptions when using LDAP authentication or authorization services

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APAR status

  • Closed as program error.

Error description

  • MQ v8 configured with LDAP authentication or authorization, gets
    the following errors intermittently.
    
    AMQ5530: Error from LDAP authentication and authorization
    service
    EXPLANATION:
    The LDAP authentication and authorization service has failed.
    The  'ldap_search' call returned error -1 : 'Unknown error'.
    The context string is  'userid'.  Additional code is 0.
    
    In some observed cases, connection attempt appears to hang for a
    minute or so.
    
    In some observed cases, a Failure Data Capture (FDC) is
    generated with:
    
    Probe Id          :- XC515091
    Component         :- xlsRWMutexRelease
    Major Errorcode   :- xecL_W_LONG_LOCK_WAIT
    MQM Function Stack
    zlaMainThread
    zlaProcessMessage
    zlaProcessSPIRequest
    zlaSPIAdoptUser
    zsqSPIAdoptUser
    kpiSPIAdoptUser
    kqiAuthenticateUserForAdopt
    kqiAuthenticateUser
    gpiAuthenticateUser
    zfu_as_AuthenticateUser
    xlsRWMutexRelease
    xcsFFST
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Queue managers configured to use LDAP authentication or
    authorization via AUTHINFO objects, where apps are connecting or
    using the authentication/authorization services concurrently.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    The queue manager was calling LDAP services concurrently,
    without adequate serialization between threads making those
    calls.
    
    Also, sometimes calls were being made to LDAP services with a
    null context handle, which caused SIGSEGV memory exceptions.
    

Problem conclusion

  • The queue manager code has been improved so that LDAP services
    are called with adequate serialization between threads making
    those calls.  Also, some extra code has been added to ensure
    that the context handle is always initialized before calling the
    LDAP services.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.7
    v9.0 CD    9.0.3
    v9.0 LTS   9.0.0.2
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT17234

  • Reported component name

    WMQ BASE MULTIP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-09-26

  • Closed date

    2017-02-27

  • Last modified date

    2017-06-09

  • 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

    WMQ BASE MULTIP

  • Fixed component ID

    5724H7251

Applicable component levels

  • R800 PSY

       UP

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Document Information

Modified date:
09 June 2017