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PI68960: 0C4 00000011,M=CSQXDISP,LOC=CSQXRCTL.CMQXRSTF

A fix is available

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APAR status

  • Closed as program error.

Error description

  • 0C4-00000011,M=CSQXDISP,LOC=CSQXRCTL.CMQXRSTF
    The client has sent a heartbeat, and a communication error has
    occurred when the CHIN has tried to send a heartbeat response
    (TCP/IP EPIPE error). This has resulted in cleanup  processing
    being performed by the receive-thread, which resulted in the
    rstStreamQueue control block being released. However,
    processing by the associated async-consume thread tried to
    access the rstStreamQueue control block, which resulted in the
    0C4.
    
    .
    Additional keywords:
    ABEND0C4 ABENDS0C4 S0C4 S00C4 0C4
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All users of IBM MQ for z/OS Version 9 Release 0             *
    * Modification 0.                                              *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * A SVRCONN channel configured with SHARECNV > 1 generates 0C4 *
    * abend in CMQXRSTF or CSQXCCMX.                               *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * none                                                         *
    ****************************************************************
    While processing a heartbeat request from the client, the
    receive thread for the channel attempted to send a heartbeat
    segment, and this failed due to the client no longer being
    available. The receive thread began terminating all
    conversations on the channel, however an error in the
    serialisation between the receive thread and the async task for
    the channel allowed the rstStreamQueue structure for one of the
    conversations to be freed by the receive thread while it was
    still being used to process a message that had been consumed by
    the async thread. When the async thread attempted to reference
    this freed control block, the dispatcher on which the receive
    and async threads were running abended S0C4.
    

Problem conclusion

  • cciReceiveThreadFn is changed to inform the async thread to stop
    consuming messages prior to ending the conversations on a
    failing channel.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI68960

  • Reported component name

    MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-09-09

  • Closed date

    2016-10-13

  • Last modified date

    2017-05-19

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

    PI62084

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

    UI41641

Modules/Macros

  • CSQXCCAX
    

Fix information

  • Fixed component name

    MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI41641

       UP17/02/01 P F701

Fix is available

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Document Information

Modified date:
19 May 2017