PM84711: OTMA MESSAGE RESCHEDULED INSTEAD OF DELETED AFTER U0243 ABEND ( MESSAGE EXPIRATION ). ONE SYMPTOM IS HUNG BE MESSAGE REGION.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• OTMA CM1 message is rescheduled instead of discarded after a
  U0243 abend.
  In customers's shared queue environment, this eventually caused
  a hang in a Back End message region due to double use of input
  YTIB on the Front End IMS. Due to the abend, DFS3688I is sent
  to FE, causing YTIB to run to deliver it; the rescheduled
  message eventually runs on the FE IMS which causes a YTIB
  serialization issue with YTIB_SYNC_PTR.
  The failing flow involves a PWFI region posted to process a
  message which expires before it is processed.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS V11 users of APPC/IMS timeout        *
  *                 (APPCIOT= in DFSDCxxx member) or OTMA        *
  *                 transaction expiration (EXPRTIME= parameter  *
  *                 on TRANSACT macro).                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: After an ABENDU0243 is encountered,     *
  *                      the input message may be incorrectly    *
  *                      requeued instead of discarded.          *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  When a scheduled message driven application program issues a
  message GU or CHKP call that subsequently results in an
  ABENDU0243 situation, the input message that is in progress
  may incorrectly get inappropriately requeued to its transaction
  when it should have been discarded.
  
  This problem can occur in the either of the following scenarios:
  
  1. a PWFI region, previously waiting on scheduling subqueue 6
     for new work, gets posted to process a newly available input
     message who's time limit expires prior to being processed.
  
  2. an applicaton message GU or CHKP call that results in IMS
     syncpoint procesing being initiated first to commit inflight
     work associated with the previous unit of recovery.
  
  
  In the reported error, the cause of the input message being
  wrongfully requeued is due to the fact that the ABENDU0243
  condition indictor, checked by module DFSFXC40 during ABTERM
  processing for determining input message handling, was
  erroneously being reset by module DFSFXC30 after the timeout
  condition was detected but prior to the U0243 abend being
  issued.
  
  It is important to make the distinction that the problem
  reported is not applicable to the case where an ABENDU243
  condition is suffered during IMS Scheduling prime GU processing.
  

Problem conclusion

• GEN:
  KEYWORDS:
   SYSPLEXSQ
  
  *** END IMS KEYWORDS ***
  Code in module DFSFXC30 has been modified to preserve the
  DLREXPIR indicator setting so that it is available to DFSFXC40
  during subsequent ABENDU0243 ABTERM processing.
  
  This will ensure that the input message is correctly discarded.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  PM92008 UK95733

Modules/Macros

• DFSFXC30
  

Fix information

• Fixed component name

  IMS V11

• Fixed component ID

  5635A0200

Applicable component levels

• R100 PSY UK95733

     UP13/07/17 P F307 ¢

Fix is available

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