PH51351: Workload can be incorrectly defrosted after CPSM CMAS cold start 23/01/09 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After application of the PTFs for APAR PH37147, when a CMAS
  looses contact with a remote CMAS in the CICSPlex, the
  remote MAS regions are marked as lostcon. This results in
  workloads they are target regions for to be frozen.
  
  However if one of the remaining CMAS regions have a CPSM
  cold start, and following CPSM warm starts, the active CMAS
  region will incorrectly mark the MAS regions as gone, resulting
  in message EYUWM0425I :
     EYUWM0425I <applid> Target region (MAS0001) for CICSplex
       (CPLX0001) has been terminated in workload
     EYUWM0425I <applid> (WLM0001).
  
  If this was the only target region in a lost state in the
  workload, this results in the workload incorrectly being
  defrosted with message :
     EYUWM0413I <applid> Workload (WLM0001) from context
       (CPLX0001) has been reactivated from Frozen.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICSPlex SM Users.                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: A CMAS incorrectly reports message      *
  *                      EYUWM0425I, that a target MAS region    *
  *                      has been terminated in a workload after *
  *                      a restart. This results in the workload *
  *                      being incorrectly defrosted on that     *
  *                      CMAS with message EYUWM0413I.           *
  ****************************************************************
  * RECOMMENDATION: Apply the PTFs for this APAR to all CMAS     *
  *                 regions and restart. This can be done in any *
  *                 order.                                       *
  ****************************************************************
  When a CMAS with connected MAS regions stops, the other CMAS
  regions set these remote MAS regions as LOSTCON in their
  topology and WLM data spaces, and freeze workloads in which
  these MASs participate.
  
  A CPSM cold start of one of the active CMAS regions
  participating in the workload results in the workload being
  imported from other active CMAS regions when a MAS in the
  workload connects after the cold start. This causes
  topology information for the remote LOSTCON MAS regions to be
  acquired. However, after this CMAS subsequently performs a CPSM
  warm start, some of the imported data can be lost. This occurs
  due to incorrect logic added by PH37147. Topology changes
  the status of the MAS to gone. This results in the WLM
  component being informed, terminating the MAS from the workload
  and defrosting it, while the MAS is still actively running, This
  is shown with message :
     EYUWM0425I <applid> Target region (<mas>) for CICSplex
       (<cicsplex>) has been terminated in workload
     EYUWM0425I <applid> (<workload>).
  followed by
     EYUWM0413I <applid> Workload (<workload>) from context
       (<cicsplex>) has been reactivated from Frozen.
  

Problem conclusion

• The topology warm start logic modified by APAR PH37147 has been
  corrected, to properly determine if MAS region is LOSTCON
  or GONE in this case, to ensure topology and associated WLM
  workloads are in the correct state, and workloads are not
  incorrectly defrosted when remote MAS regions may still be
  operating.
  

Temporary fix

Comments

APAR Information

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

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

  PH51654 UI83955 UI83956 UI83957

Modules/Macros

• EYU0TIWS
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R10M PSY UI83957

     UP23/01/18 P F301 {

• R20M PSY UI83956

     UP23/01/18 P F301 {

• R30M PSY UI83955

     UP23/01/18 P F301 {

Fix is available

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