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PI76153: ABEND 0C4-00000004,C=W9700.800.CHIN,M=CSQXSMFT, LOC=CSQXSMFT.????????

A fix is available

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APAR status

  • Closed as program error.

Error description

  • The customer experienced an ABEND;
    ABN= 0C4-00000004,C=W9700.800.CHIN,M=CSQXSMFT,
    LOC=CSQXSMFT.????????
    .
    The reason for the abend is a timing/serialization
    issue at startup whereby the SMF task can start
    processing SMF data before the SSL task control
    blocks have been correctly initialized.
    .
    Additional Symptom(s) Search Keyword(s):
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 *
    *                 Release 0 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Abend S0C4 may occur in module          *
    *                      CSQXSMFT at Channel Initiator           *
    *                      startup.                                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    At Chinit startup, the Chinit SMF task is attached as an
    asynchronous TCB, but is dependent on some other storage
    initialization that may not have yet occurred. There is a race
    condition between the SMF task and mainline initialization where
    it's possible for the SMF task to attempt to access storage that
    has not yet been correctly initialized.
    

Problem conclusion

  • Synchronization has been added during Chinit startup to ensure
    that the necessary storage is initialized before being accessed
    by the SMF task.
    000Y
    CSQXSMFT
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI76153

  • Reported component name

    WMQ Z/OS 8

  • Reported component ID

    5655W9700

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-02-07

  • Closed date

    2017-04-19

  • Last modified date

    2017-07-05

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

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

    PI76166 UI46531

Modules/Macros

  • CSQXSMFT
    

Fix information

  • Fixed component name

    WMQ Z/OS 8

  • Fixed component ID

    5655W9700

Applicable component levels

  • R000 PSY UI46531

       UP17/06/06 P F706

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.



Document information

More support for: IBM MQ

Software version: 8.0

Reference #: PI76153

Modified date: 05 July 2017


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