PK81864: DURING A CICS RESTART, A DFHRM0002 RC0397 MAY OCCUR FOR A CMAM TRANSACTION.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• During a CICS restart, the CMAM transaction may be attached
  to resync with the remote parent region.  It will start the
  perform_unshunt recovery process.  During this time the CSXM
  transaction is running and performing unshunt work for UOWs in
  backout state.  A timing problem may occur where the CMAM task
  may find out that the UOW has already been unshunted and
  recovered by the CSXM transaction, or that the UOW is already in
  some form of recovery.
    This leads to a DFHRM0002 0397 error.
  Additional Keywords: RM0002 X'0397' X'397'
  KIXREVACC
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All.                                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: During a CICS emergency restart, CICS   *
  *                      may abend with message DFHRM0002 for a  *
  *                      severe error in module DFHRMLSU.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  During a CICS emergency restart, while recovering the UOWs
  from the system log, a race can occur between the CSXM task
  and an attached task.
  
  When a UOW has two RUNT links associated with it, the first link
  to be processed by the CSXM task will lead to a task being
  attached to complete the unshunting process for the UOW. The
  CSXM task will then continue to process the next link. In this
  case it moves on to the second link from the UOW. The CSXM task
  begins to process the second link and sets the recovery in
  progress flag. The task is suspended before completion. While
  CSXM is suspended, the attached task begins. This discovers
  that there is a second link for this UOW, so begins to process
  it. At this point it discovers that recovery is already in
  progress. This leads to a disaster response and subsequent
  msgDFHRM0002 being issued.
  
  Additional Keywords: RM0002 RMLSU 0397 X'0397' SFR CMAM
  

Problem conclusion

• DFHXMRM1 has been altered so that if recovery_already_in_prog
  is found on the first initiate_recovery call, then the codepath
  is exited straight away and processing continues as normal.
  

Temporary fix

•             *********
              * HIPER *
              *********
  FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

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

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

  UK46940 UK46941 PK88762

Modules/Macros

•    DESXMRM  DFHXMRM  DFHXMRM1
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK46940

     UP09/06/03 P F906

• R500 PSY UK46941

     UP09/06/03 P F906

Fix is available

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