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OA37473: AE OA37305 FIX COMPLETION

A fix is available

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APAR status

  • Closed as program error.

Error description

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users who specify SHAREACB in            *
    *                 their Telnet profiles.                       *
    ****************************************************************
    * PROBLEM DESCRIPTION: Loop in ISTTSCWU due to a corrupted     *
    *                      TSEXT_TN_RDTES chain.                   *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The problem may be summarized as follows:
    1. The Telnet profile has SHAREACB coded.
    2. Some action occurs to bring down the VTAM
       session and cleanup VTAM's RDTE for a Telnet
       LU name (such as a client disconnect or the
       stopping of the Telnet server).
    3. The RDTE cannot be freed because VTAM is
       waiting for the FMCB to be freed and so the
       RDTE is queued on TSEXT_TN_RDTES chain.
    4. The FMCB is freed during UNBIND response
       processing.
    5. The PLU tries to redrive the session to the
       Telnet LU name.
    6. The RDTE is found, but its state causes the
       session to fail with an 0801000C sense code.
    7. The cleanup of the new session is allowed to
       free the RDTE because the FMCB has been freed.
    8. Later, when the Wake Up Pab processes the
       TSEXT_TN_RDTES chain, it finds the free RDTE
       on the chain.  Results can vary based on the
       state of the storage where the RDTE had been.
       This could be a loop in ISTTSCWU, an ABEND0C4
       in ISTTSCWU, an ABEND0A9 in ISTCPCDR, or just
       CPRC recorded in the VIT in ISTCPCDR.
    

Problem conclusion

  • The following changes have been made:
    ISTLUCST and ISTSSCU3 have been changed to make
    the RDTE not findable when adding the RDTE to
    the TSEXT_TN_RDTES chain.
    ISTDECDE and ISTTSCWU have been updated to ensure
    they do not make another RDTE not findable.
    DYNAMRDT, ISTCPCDR, ISTTSCWU, ISTDECL2, ISTOCCMV,
    ISTPUCOA, and ISTTSCWU have been changed to pass
    the RDTE at the appropriate times.
    

Temporary fix

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

Comments

APAR Information

  • APAR number

    OA37473

  • Reported component name

    VTAM V4 MVS/ESA

  • Reported component ID

    569511701

  • Reported release

    1C0

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2011-09-06

  • Closed date

    2011-09-07

  • Last modified date

    2012-01-01

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

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

    UA62075 UA62076

Modules/Macros

  • DYNAMRDT ISTCPCDR ISTDECDE ISTDECL2 ISTLUCST
    ISTOCCMV ISTPUCOA ISTSSCU3 ISTTSCWU
    

Fix information

  • Fixed component name

    VTAM V4 MVS/ESA

  • Fixed component ID

    569511701

Applicable component levels

  • R1C0 PSY UA62075

       UP11/12/21 P F112 Ž

  • R1D0 PSY UA62076

       UP11/12/21 P F112 Ž

Fix is available

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Document Information

Modified date:
01 January 2012