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PM30220: SPORADIC ABENDS S0C4-11 AND U3999 AFTER FAILED ATTEMPT OF SETTING EXTERNAL SUCCESSOR OF DYNAMICALLY ADDED OCCURRENCE

A fix is available

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APAR status

  • Closed as new function.

Error description

  • After applying maintenanc to TWS z/OS 8.5.1, sporadically
    abends 0C4 and U3999 are seen. The abends appear to be related
    to be trigged by a failed attempt of setting an external
    successor of the occurrence being dynamically added.
    The S0C4-11 abend is seen first:
    IEA995I SYMPTOM DUMP OUTPUT  315
     SYSTEM COMPLETION CODE=0C4  REASON CODE=00000011
      TIME=13.06.50  SEQ=11947  CPU=0000  ASID=0151
      PSW AT TIME OF ERROR  078D1000   A086675E  ILC 2  INTC 11
        ACTIVE LOAD MODULE           ADDRESS=20850528  OFFSET=0001
        NAME=EQQMCTOP
       DATA AT PSW  20866758 - D1685850  D1680E24  5870D124
        GR 0: 00000003_001D6A78   1: 00000000_001D6A3C
           2: 00000000_20C28FE7   3: 00000000_00000027
           4: 00000000_20DD6008   5: 00000000_00000027
           6: 00000000_00000004   7: 00000000_20C28FE7
           8: 00000000_00000027   9: 00000000_20866D40
           A: 00000000_20C28BC0   B: 00000000_A0865D40
           C: 00000000_00000000   D: 00000000_001D6960
           E: 00000000_A08663B2   F: 00000000_A08134D0
    
    .
    This is followed some minutes later by abend U3999:
    IEA995I SYMPTOM DUMP OUTPUT
      USER COMPLETION CODE=3999
     TIME=15.50.44  SEQ=34916  CPU=0000  ASID=0035
     PSW AT TIME OF ERROR  078D1000   80095814  ILC 2  INTC 0D
       ACTIVE LOAD MODULE           ADDRESS=000857F0
    OFFSET=00010024
       NAME=EQQBEX
       DATA AT PSW  0009580E - 00181610  0A0D1812  0A0D47F0
      AR/GR 0: 00000000/80000000   1: 00000000/80000F9F
             2: 010100D0/00000F9F   3: 00000000/0016D690
             4: 00000000/C5D8D8C2   5: 00000000/C4C54040
             6: 00000000/C5E7C9E3   7: 00000000/40404040
             8: 00000000/00000F9F   9: 00000000/00000001
             A: 00000000/001CB950   B: 00000000/80095600
             C: 00000000/24A22BC0   D: 00000000/000DD068
             E: 00000000/80085AAC   F: 00000000/00000000
    .
    Note R4/R5 contains EQQBDE
    .
    After the U3999 abend, the following message is seen in the
    controller EQQMLOG:
    EQQG004E SUBTASK GS EXECUTOR 01 ABENDED, IT IS
     RESTARTED AT CLEANUP
    .
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: ALL TWS for z/OS USERs                       *
    *                                                              *
    *                 FUNCTION=GS                                  *
    ****************************************************************
    * PROBLEM DESCRIPTION: Randomic abends (U3999 or S0C4) may     *
    *                      occur during occurrence dynamic add.    *
    ****************************************************************
    * RECOMMENDATION: APPLY THE PTF FIXING THIS APAR               *
    ****************************************************************
    Randomic abends (U3999 or S0C4) may occur during occurrence
    dynamic add.
    

Problem conclusion

Temporary fix

Comments

  • the abends are caused by a wrong calculation of MTDs of type
    'add external successor' during dependency resolution
    processing.
    Moreover the fix has been extended to support big amounts of
    external successors at occurrence level during dynamic add.
    This change has been implemented by removing an old
    existing design limitation.
    

APAR Information

  • APAR number

    PM30220

  • Reported component name

    TIV WRKLD SCHD

  • Reported component ID

    5697WSZ01

  • Reported release

    510

  • Status

    CLOSED UR1

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2011-01-11

  • Closed date

    2011-01-17

  • Last modified date

    2011-03-02

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

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

    UK63977 UK63978 UK63979 UK63980

Modules/Macros

  • EQQMC0RD EQQMC1AS EQQMC1DR EQQMC1RS EQQMC3TS
    

Fix information

  • Fixed component name

    TIV WRKLD SCHD

  • Fixed component ID

    5697WSZ01

Applicable component levels

  • R202 PSY UK63977

       UP11/02/12 P F102 Ž

  • R302 PSY UK63978

       UP11/02/12 P F102 Ž

  • R502 PSY UK63979

       UP11/02/12 P F102 Ž

  • R512 PSY UK63980

       UP11/02/12 P F102 Ž

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

Modified date:
02 March 2011