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PH08055: ABEND 0C4-00000038 IN CSQWVCOL+0000060A

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ABN=0C4-00000038,U=SYSOPR,C=MQ900.900.SSSC-CSQ3EOTS,M=CSQ3AAES,
    LOC=CSQWDLD2.CSQWVCOL+0000060A
    
    
    The abend has occurred when attempting to build a trace entry
    for a newly created EB.
    
    When EB was created, it attempted to get a THTR block to use
    for trace, however none were available on the free chain
    and so it obtained one from the PHB.
    When the EB subsequently attempted to build the trace entry, it
    checked if it had been allocated a tseg yet, and if not would
    have obtained one.
    
    However, the tseg pointer contained a residual value, causing an
    invalid address to be used to locate the tseg, and leading to
    the abend when trying to access the tseg using it.
    

Local fix

  • The abend only occurs when running with internal trace enabled,
    and so stopping internal trace should prevent any reoccurrence
    of this problem.
    

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: ABEND0C4 in CSQWVCOL after the QMGR     *
    *                      internal trace is activated due to      *
    *                      residual data in the THTR thread        *
    *                      control block.                          *
    ****************************************************************
    As part of an execution unit switch CSQVFEB was called to obtain
    and format a new execution block EB, and thread control block
    THTR. Specific fields within the THTR were formatted, but the
    remaining THTR storage was not initialised.
    In the reported problem field thtr.pSeg64, which had not been
    formatted, contained residual data leading to the reported
    ABEND 0C4 in CSQWVCOL.
    
    Additional keywords: 6C6 S6C6 ABEND6C6 ABENDS6C6 vgca vgcathtr
    

Problem conclusion

  • Module CSQVFEB has been updated so that any new THTR thread
    control block obtained will be cleared before individual fields
    are formatted.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH08055

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-02-02

  • Closed date

    2019-04-24

  • Last modified date

    2021-06-14

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

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

    UI62646 UI62647 PH38095

Modules/Macros

  • CSQVFEB
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI62646

       UP19/06/06 P F906 ¢

  • R100 PSY UI62647

       UP19/06/06 P F906 ¢

Fix is available

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Document Information

Modified date:
15 June 2021