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PH09238: ABN=0C4-00000004,U=MQSSTC ,C=MQ900.900.MMC -CSQMJCLU, M=CSQGFRCV,LOC=CSQMLPLM.CSQMJCLU CSQX519E 20/01/29 PTF PECHANGE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • CHIN suffered the following abend but stayed up and no further
    issues were seen:
    
    ABN=0C4-00000004,U=MQSSTC  ,C=MQ900.900.MMC -CSQMJCLU,
    M=CSQGFRCV,LOC=CSQMLPLM.CSQMJCLU
    
    CSQMJCLU is at UI52881.
    
    The reason for this problem is that MQ is loading a channel
    object and making an internal copy of it.
    
    Unfortunately the code has picked up the wrong length of the
    control block because it is actually an older internal version
    of the block.
    
    Normally this extra data being copied is harmless and no
    negative effects are seen, however, in this particular case the
    object is located near the end of a Key 7 page and is
    immediately followed by a page of another Key.
    
    Because of this, instead of benignly copying some additional,
    unnecessary, data, instead it attempts to read from storage
    that cannot be accessed in the current mode and the S0C4-4
    protection exception abend occurs.
    
    ADDITIONAL SYMPTOM : CSQX519E ABEND0C4 ABENDS0C4
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 0 Modification 0 and Release 1       *
    *                 Modification 0.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: When processing an MQICLU SPI request,  *
    *                      CSQMJCLU may get an 0C4 if there is a   *
    *                      pre V2.10 cluster channel being         *
    *                      inquired.                               *
    ****************************************************************
    When identifying objects, CSQMJCLU has logic specific to
    channels for allocating storage to copy the object into. PI91107
    added a new special case for channels but the way the code was
    added meant that the pre V2.10 channel logic no-longer worked as
    expected. With the incorrect amount of storage now being
    allocated for a pre V2.10 channel object an 0C4 may result when
    CSQMJCLU attempts to read beyond the end of an allocated storage
    block. The symptom will only be seen if the over-run goes into
    unallocated storage addresses.
    

Problem conclusion

  • Code has been changed to allocate the appropriate amount of
    storage for pre V2.10 channels.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH09238

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-03-05

  • Closed date

    2020-01-29

  • Last modified date

    2020-06-01

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

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

    UI67620 UI67621

Modules/Macros

  • CSQ7CBM  CSQ7CHND CSQ7VTBL CSQMICLU CSQMJCLU CSQXRCDX
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI69037

       UP20/05/29 P F005 {

  • R100 PSY UI69038

       UP20/05/29 P F005 {

Fix is available

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Document Information

Modified date:
02 June 2020