PM69242: ABENDSB78 RC 00000018 WHEN DOING A STORAGE RELEASE FROM DFSAOSW0 FOR AN AWE.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Abend SB78 - 00000018 is issued indicating the wrong TCB has
    been passed on a Storage Release request. The Storage is being
    released by module DFSAOSW0. When the call is made DFSAOSW0
    passes the value found in AWAOSKEY. This AWE storage was
    obtained and queued by DFSXCF00. The storage was not cleared
    and key was not passed so the data used is residual. With the
    useage of the residual data it can result in the store of the
    key value to indicate in R15 that the TCB is being passed. If
    this happens, the abend will occur as no TCB is passed.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All IMS V11 users of APPC SMQ Enablement.    *
    ****************************************************************
    * PROBLEM DESCRIPTION: IMS control region abends with B78 RC18 *
    *                      'incorrect task control block ( TCB )   *
    *                      address' during a storage release       *
    *                      attempt.                                *
    ****************************************************************
    * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
    ****************************************************************
    In an APPC shared queues environment with front-end and back-end
    IMS systems configuration, an IMS's XCF Message exit receives
    control when a message becomes available for this IMS.  The
    message was sent from another IMS member of the XCF group.  The
    message that the exit retrieves in this problem is DFS2224I
    'Transaction on a back-end system abended'.
    
    The exit obtains a storage buffer to hold the message data and
    then sends the buffer to a server for further processing.  When
    the server finishes its processing, it is responsible for
    releasing the obtained storage.  The exit sends the information
    about the storage such as subpool number, storage size to the
    server for releasing the storage, but does not send the storage
    key.  The server receives the storage information and uses the
    residual data as the storage key to release the storage.  The
    residual data can cause unpredictable results.
    
    In this reported problem, the invalid storage key incorrectly
    turns on the 'TCBADDR provided' bit 5 of the byte 0 as an input
    to the storage release service.  The incorrectly-set flag causes
    the storage release service to expect the address of a TCB that
    owns the storage to be passed to it.  The TCB address is not, in
    fact, provided.  As a result, the release service fails with
    system abend B78 RC18 'incorrect task control block address' and
    this abend brings down the control region.
    
    IEA705I ERROR DURING FREEMAIN SYS CODE = B78-18 IMS1
    IEA705I 00FA7880 00693C58 00000000 0000010F
    DFS629I IMS RRS TCB ABEND - SYS B78           IMS1
    DFS629I PSW AT ERROR = 070C1000 8155FDF6  IMS1
    DFS629I MODID = UNKNOWN           EPA = UNKNOWN   IMS1
    DFS629I R0-3   84000000 84B78000 00000004 0F800001  IMS1
    DFS629I R4-7   00000000 00000005 00000007 00000B78  IMS1
    DFS629I R8-11  00000018 00004008 0C862FF8 00000000  IMS1
    DFS629I R12-15 8155FDBE 7FF14008 8C2D73FC 00000018  IMS1
    
    Note:  This APAR is not fully effective until it is installed on
    all IMSs in the shared queues group.  However, it does not need
    to be installed on all IMSs simultaneously.  It can be applied
    to one IMS system at a time in a rolling fashion until it has
    been installed on all IMSs in the shared queues group.
    
    KEYWORDS: ABENDSB78 RC18 SB78 B78 ABENDB78
    

Problem conclusion

  • GEN:
    KEYWORDS:
     SYSPLEXSQ
    
    *** END IMS KEYWORDS ***
    DFSXCF00 - IMS Interface Module to z/OS XCF Services
    
    In the Message Exit XCFMSGE, added the storage key together with
    other storage information in the AWE to be sent to the message
    processing server.
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    PM69242

  • Reported component name

    IMS V11

  • Reported component ID

    5635A0200

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-07-19

  • Closed date

    2012-08-09

  • Last modified date

    2013-02-01

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

    PM69232

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

    UK80980

Modules/Macros

  •    DFSXCF00
    

Fix information

  • Fixed component name

    IMS V11

  • Fixed component ID

    5635A0200

Applicable component levels

  • R100 PSY UK80980

       UP12/08/14 P F208

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.



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Document information


More support for:

IMS

Software version:

100

Reference #:

PM69242

Modified date:

2013-02-01

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