PI64335: DFHMN0002 SEVERE ERROR CODE X'0223' DFHMNMN

Obtain the fix for this APAR.

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

Comments

APAR Information

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

  PI63849

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

  PI66269 UI41229

Modules/Macros

• DFHMNMN
  

Fix information

• Fixed component name

  CICSTS FOR ZVSE

• Fixed component ID

  5655VSE00

Applicable component levels

• RB2P PSY UI41229

     UP17/01/18 I 1000

Fix is available

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