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PI76166: ABEND 0C4-00000004,M=CSQXSMFT, LOC=CSQXSMFT.????????

A fix is available

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • The customer experienced an ABEND;
    ABN= 0C4-00000004,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 IBM MQ for z/OS Version 9 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.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI76166

  • Reported component name

    MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • 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

    2017-06-02

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

    PI76153

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

    UI46533

Modules/Macros

  • CSQXSMFT
    

Fix information

  • Fixed component name

    MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI46533

       UP17/05/19 P F705

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: 9.0

Reference #: PI76166

Modified date: 02 June 2017


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