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PI73577: IPIC connections are unresponsive after a CICS server restart and msgIEE342I is issued.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Intermittently a problem occurs where a Gateway daemon does not
    reconnect to IPIC connected CICS servers after the CICS servers
    have been restarted.
    
    Attempts to issue modify commands to the Gateway daemon using
    the SDSF command do not complete successfully and might return
    the following message:
    IEE342I MODIFY REJECTED-TASK BUSY modify rejected task busy
    
    The following messages might also be written to the CICS TG log:
    CTG8495E Communication failure for IPIC connection to CICS
             server <server_name> reason = java.io.IOException: End
             of stream
    CTG8433E Connection failure for IPIC connection to CICS server
             <server_name> reason =  java.net.Connect Exception:
             EDC8128I Connection refused
    
    Additional search words: msgIEE342I IEE342 msgIEE342 msgCTG8495E
    msgCTG8495 CTG8495 msgCTG8433E CTG8433 msgCTG8433
    

Local fix

  • Restarting the Gateway daemon clears the problem.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All users of CICS Transaction Gateway and IPIC connected     *
    * CICS servers.                                                *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * IPIC sessions deadlocked and message IEE342I issued after    *
    * SDSF modify command.                                         *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * .                                                            *
    ****************************************************************
    When CICS TG closes a number of IPIC sessions at the same time.
    it is possible for 2 sessions to deadlock on the same resource.
    In this deadlock one of the sessions can be holding a CICS TG
    statistics record while waiting for the deadlocked resource.  If
    the CICS TG ZOSConsole thread then attempts to collect
    statistics it can also become deadlocked and issue the message
    IEE342I.  Any further attempts to use CICS TG administration
    commands from the SDSF console will not complete. The Gateway
    daemon will continue to process ECI requests over IPIC sessions
    that are not affected by the deadlock. It is also possible that
    the IPIC session deadlock will hold statistics resources that
    will prevent scheduled statistics from being collected.
    

Problem conclusion

  • CICS TG has been changed to remove the reported deadlock on IPIC
    session closure.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI73577

  • Reported component name

    CTG V9 FOR Z/OS

  • Reported component ID

    5655Y2000

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-12-12

  • Closed date

    2016-12-14

  • Last modified date

    2017-01-03

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

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

    UI43331 UI43332 UI43333

Modules/Macros

  • CTG00201 CTG00204
    

Fix information

  • Fixed component name

    CTG V9 FOR Z/OS

  • Fixed component ID

    5655Y2000

Applicable component levels

  • R900 PSY UI43331

       UP16/12/20 P F612

  • R910 PSY UI43333

       UP16/12/20 P F612

  • R920 PSY UI43332

       UP16/12/20 P F612

Fix is available

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Document Information

Modified date:
09 August 2024