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PI94365: ABEND 878-10 ABEND 878-00C CSQX027E UNABLE TO GET STORAGE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Channel initiator CHIN task hung due to storage shortage.
    .
    +CSQX004I CSQ1 CSQXSPRM Channel initiator is using
                   1565 MB of local storage, 2 MB are free
    ICH409I 878-00C ABEND DURING IRRSIA00 PROCESSING.
    IEA794I SVC DUMP HAS CAPTURED: DUMPID=078 REQUESTED BY JOB
                   (CSQ1CHIN) DUMP
    TITLE=ISSUER=IRRRCOMR,COMPID=5752-XXH00,COMPON=RACF,CSECT=
    IRRRIA00,LVL=UA83371,ABEND=878-00C,USR=CSQ1CHIN
    .
    IEA705I SYSTEM COMPLETION CODE=878  REASON CODE=00000010
    +CSQX027E CSQ1 CSQXRCTL Unable to get storage,
    .
    Subpool 131 key 8 storage high
    .
    The listener in retry processing is leaking a small amount of
    stack storage each time it enters retry processing.
    

Local fix

  • Stop the retrying listener or resolve the networking issue that
    is preventing the listener from connecting.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 0 Modification 0, Release 1          *
    *                 Modification 0 and Release 2 Modification 0. *
    ****************************************************************
    * PROBLEM DESCRIPTION: XSKB storage leak in Subpool 131 Key 8  *
    *                      storage in the channel initiator        *
    *                      address space.                          *
    ****************************************************************
    When an ending channel initiator task releases its XEB, CSQXVFRE
    is called to release any XSKB stack segments on the XEB free
    chain, if any.
    An error in CSQXVFRE causes the last XSKB to be skipped when
    freeing this chain, resulting in the 32K segment being leaked.
    
    Over time an accumulation of these leaked blocks can lead to
    performance degradation and/or storage shortage in the channel
    initiator address space.
    
    Additional keywords: SOS 878 CSQX027E
    

Problem conclusion

  • CSQXVFRE has been changed to free all XSKB segments on the
    free chain.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI94365

  • 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

    2018-02-27

  • Closed date

    2021-05-14

  • Last modified date

    2021-06-02

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

    PI89563

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

    UI54537 UI75406 UI75407

Modules/Macros

  • CSQXVFRE
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R100 PSY UI75407

       UP21/05/29 P F105 ¢

  • R200 PSY UI75406

       UP21/05/29 P F105 ¢

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:
03 June 2021