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PI63849: DFHMN0002 SEVERE ERROR CODE X'0223' DFHMNMN

A fix is available

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APAR status

  • Closed as program error.

Error description

  • During a slow down of a CICS Transaction Server for VSE
    you get error DFHMN0002 with severe error code X'0223'
    in module DFHMNMN.
    .
    CICS internal trace shows that CICS
    doesn't process a lock correctly
    when the application timed out during a Syncpoint request.
    .
    It has to suspend when it tries to get a lock
    .
    EIP   ENTRY SYNCPOINT
    MNMN  ENTRY PERFORMANCE_DATA_PUT  SYNCPOINT
    LMLM  ENTRY LOCK                  07D129B8,EXCLUSIVE
    DSSR  ENTRY SUSPEND               00530005,NO,LOCK,NO
    .
    It takes too long to get the lock
    and the task is purged.
    .
    DSSR  *EXC* SUSP_PURGED           SUSPEND,00530005,NO,LOCK,YES
    DSSR  EXIT  SUSPEND/PURGED        TASK_CANCELLED
    LMLM  *EXC* THE TASK REQUESTING A LOCK HAS BEEN PURGED.
    LMLM  EXIT  LOCK/PURGED
    .
    Even though it never got the lock,
    CICS requests an unlock, which fails:
    .
    LMLM  ENTRY UNLOCK                07D129B8,EXCLUSIVE
    LMLM  EXIT  UNLOCK/EXCEPTION      NOT_LOCK_OWNER
    MNMN  *EXC* Unlock                request failed
            UNLOCK,EXCEPTION,NOT_LOCK_OWNER
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All.                                         *
    ****************************************************************
    * PROBLEM DESCRIPTION: Forcepurging a task results in message  *
    *                      DFHMN0002 A severe error (code X'0223') *
    *                      has occurred in module DFHMNMN being    *
    *                      issued.                                 *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    A CICS region has monitoring active. At least two tasks are
    attempting a syncpoint, which will lead to some monitoring data
    needing to be written and therefore the task will need exclusive
    control on the global monitoring lock. Since task 1 has the
    lock, any subsequent tasks will need to wait. One of these
    waiting tasks is purged. Having been purged, the task continues
    to process monitoring code including running any active program
    for user exit XMNOUT and then calls unlock. However since this
    task was purged it never had the global monitoring lock, so when
    it attempted to unlock it a severe error is issued. This results
    in trace entry MN 0223 and msgDFHMN0002 being issued.
    
    Additional Keywords: NOT_LOCK_OWNER MN0002 MN0223 LM0047
    LM 0047 LMLM  *EXC* TASK-REQUESTING-LOCK-HAS-BEEN-PURGED
    

Problem conclusion

  • DFHMNMN has been altered to ensure that if the monitoring global
    lock is not obtained during a syncpoint no further monitoring
    processing will occur.
    

Temporary fix

  • FIX AVAILABLE BY PTF ONLY
    

Comments

APAR Information

  • APAR number

    PI63849

  • Reported component name

    CICSTS FOR VSE

  • Reported component ID

    564805400

  • Reported release

    B0P

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-06-08

  • Closed date

    2016-09-29

  • Last modified date

    2016-10-07

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

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

    PI64335

Modules/Macros

  • DFHMNMN
    

Fix information

  • Fixed component name

    CICSTS FOR VSE

  • Fixed component ID

    564805400

Applicable component levels

  • RB0P PSY UI41246

       UP16/10/07 I 1000

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.

[{"Business Unit":{"code":"BU011","label":"Systems - zSystems software"},"Product":{"code":"SSGMGV","label":"CICS Transaction Server"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"1.1.1","Edition":""}]

Document Information

Modified date:
07 October 2016