PM65749: MULTIPLE 0C4 ABENDS SEEN IN DFHXCTRP DUE TO A CORRUPTED TRA_AVLEN FIELD

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APAR status

  • Closed as program error.

Error description

  • Multiple 0C4 abends and random overlays of EXCI control
    blocks occur when field TRA_AVLEN has been corrupted within
    the EXCI trace anchor block. At CICS/TS 4.2 code has been
    changed to use 64 bit registers. The corruption of TRA_AVLEN
    happens when a new trace block is acquired and the first 4
    bytes of 64 bit register 9 is not clean on entry to DFHXCTRP.
    
    Additional Symptom(s) Search Keyword(s): KIXREVDAM
    VERBX LEDATA:
     15                   +000036E6              DFHXCPRX
     16       ....*DFHXCPRH....0670I....HCI6700 .-CICS 5655-S97
                          +00004896              DFHXCPRX
     17       baseEXCIPipeOperation
                          +00000242              *PATHNAM
     18       openEXCIPipe+00000084              *PATHNAM
     21       MVS_CcicsECI+0000051E              *PATHNAM
     22       Java_com_ibm_ctg_server_ServerECIRequest_CcicsECI
    ... java code occurs here in stack ...
    Javacore:
    com/ibm/ctg/server/ServerECIRequest.CcicsECI(Native Method)
    com/ibm/ctg/server/ServerECIRequest.executeECINative
    com/ibm/ctg/server/ServerECIRequest.executeECI
    com/ibm/ctg/server/ServerECIRequest.execute
    com/ibm/ctg/client/LocalWorker.execute
    .
    Customers may also see the following messages when attempting
    to make an EXCI call to a CICS region that is unavailable:
    DFHEX0114  Incorrect data has been passed for EXCI tracing
    causing a program check in DFHXCTRP.
    DFHEX0001  An abend (code 0C4/----) has occurred in module
    DFHXCTRP.
    MSGDFHEX0114 MSGDFHEX0001 ABEND0C4 ABENDS0C4
    ABEND0C4 in DFHXCTRP + x'420'
    

Local fix

  • Local Fix￘
    Use CICS/TS 4.1 code within the SDFHEXCI library
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS users.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Program check (x'0c4') is reported in   *
    *                      DFHXCTRP while moving trace data from   *
    *                      DFHXCPRH to last trace block.           *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    DFHXCTRP was changed at CICS/TS 4.2 to support 64 bit
    mode although it still run in 31 bit mode. TRA_NAB and
    TRA_AVLEN are defined as 64 bit value marking the next byte
    address and left space in internal trace block.
    When one block is full and the other block is needed,
    NEW_BLOCK is invoked to address the new block. R8 and R9 are
    used in that routine to set new value of TRA_NAB and TRA_AVLEN.
    Load Address (LA) is used in update the only last 4 bytes of
    register and eventually the value in R8 and R9 are restored
    to TRA_NAB and TRA_AVLEN. Most of the time it is OK but when
    it happens that the top 4 bytes of R9, is not x'00000000',
    TRA_AVLEN will be updated with a large value , like
    x'0000000B FFF94C62'.
    The trace entry is written into the new block until the
    trace block is full. DFHXCTRP check TRA_AVLEN to see if there
    is enough space for new trace entry. Because TRA_AVLEN is
    very large, trace entry writing will continue until access
    the invalid address.
    Additional Keywords: S0C4 ABEND0C4
    

Problem conclusion

  • DFHXCTRP is changed to clear R8 and R9.
    

Temporary fix

  • FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PM65749

  • Reported component name

    CICS TS Z/OS V4

  • Reported component ID

    5655S9700

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-05-29

  • Closed date

    2012-07-10

  • Last modified date

    2012-11-16

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

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

    UK80223

Modules/Macros

  •    DFHXCTRP
    

Fix information

  • Fixed component name

    CICS TS Z/OS V4

  • Fixed component ID

    5655S9700

Applicable component levels

  • R700 PSY UK80223

       UP12/07/21 P F207

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:

CICS Transaction Server

Software version:

4.2

Reference #:

PM65749

Modified date:

2012-11-16

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