PM80395: CICS SOS DFHSM0133 IN ESDSA, STORAGE CREEP IN IE_BUFF SUBPOOL.

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APAR status

  • Closed as program error.

Error description

  • CICS TS 4.1
    DFHSM0133 CICS is under stress (short on storage above 16MB)
    Analysis of the dump taken when DFHSM0133 was issued shows
    the EUDSA and ESDSA are both marked SOS.
    ESDSA has a large IE_BUFF subpool (id 84) size 125M.
    The IE domain shows approx 1700 active conversations represented
    bu IECSB control blocks with chained IE_BUFF and IECCB blocks.
    The size of the IE_BUFF subpool contributes to the SOS in CICS.
    .
    Looking at the Joblog for this region which has been running
    for several months shows that there were around 1700 instances
    of a connection timeout with CICS TG and messages:
    DFHIE0998 Mirror transaction processing ECI request from TCP/IP
    connected client has abended with AITH
    DFHIE1105 Error attempting socket send to ECI client.
    .
    After one of these abendAITH, the IECSB and its
    IE_BUFF and IECCB are not being freemained causing the
    IE_BUFF subpool in the CICS ESDSA to grow larger and larger.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All CICS Users                               *
    ****************************************************************
    * PROBLEM DESCRIPTION: A storage leak occurs when CICS         *
    *                      Transaction Gateway abnormally          *
    *                      close an ECI over TCPIP connection      *
    *                      and mirror tasks are active for the     *
    *                      connection.                             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    A collection of CICS Transaction Gateway connected mirror
    tasks are active in CICS. The CICS Transaction Gateway
    connection is abnormally terminated. This causes a CIEP task
    to be attached.This task detects that an error has occurred
    which drives client_error processing in DFHIEIE. CIEP loops
    through the IECCBs for the connected mirror tasks, attempting
    to send an FMH7 to the remote client on behalf of the mirror
    tasks.It getmains a temporary buffer to hold the FMH7 message.
    One of the SENDs fails due to the state of the socket
    connections DFHIEIE's socket SEND logic raises an error and
    exits DFHIEIE. This causes FMH7 processing to be abandoned and
    the 33k temporary buffer used for FMH7 processing is never
    freemained.
    

Problem conclusion

  • DFHIEIE has been changed so that if a socket SEND error occurs
    in client_error processing,cleanup will continue which ensures
    that the temporary 33K FMH7 buffer is freed.
    

Temporary fix

  • FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PM80395

  • Reported component name

    CICSTS V3 Z/OS

  • Reported component ID

    5655M1500

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-11

  • Closed date

    2013-02-06

  • Last modified date

    2013-03-04

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

    PM58976

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

    UK91463

Modules/Macros

  •    DFHIEIE
    

Fix information

  • Fixed component name

    CICSTS V3 Z/OS

  • Fixed component ID

    5655M1500

Applicable component levels

  • R500 PSY UK91463

       UP13/02/15 P F302

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:

3.2

Reference #:

PM80395

Modified date:

2013-03-04

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