PH18483: HIGH CPU LOOP IN DFHLEPTQ WITH RECURSIVE 0C4/AKEX IN DFHLEPTQ.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CICS region was using excessive CPU and it appears we have a
  recursive abend in transaction CISS related to a new IPIC
  definition.
  .
  CICS was cancelled with a dump.
  Dump shows:
  A CISS task looping on the SO TCB with repeating
  0C4/AKEX issued by DFHLEPTQ +x216 in its recovery routine
  on instruction 5000 7020   ST   R0,32(,R7)
  This CISS task also owns an S8 TCB
  .
  CICS has gone MXT with CISS tasks which arrived after the
  first CISS went into the loop on SO TCB.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: High CPU usage after abend on an S8 TCB *
  *                      resulting in a loop in DFHLEPTQ         *
  *                      recovery.                               *
  ****************************************************************
  An abend occurs on an S8 TCB which drives recovery in DFHLEPTQ
  on a different TCB. DFHLEPTQ issues a change mode to the S8 TCB
  which fails. DFHLEPTQ assumes that we are running on the S8 TCB
  and drives a codepath which is inappropriate for the TCB which
  we are running on. This leads to an abend 0C4 which drives the
  same recovery routine again resulting in a recursive loop.
  
  Additional Keywords: abendAKEX abend0C4
  

Problem conclusion

• DFHLEPTQ has been changed to check for the response from the
  change mode request and percolate if there is an error.
  

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:

  UI69227 UI69228 UI69229 UI69230

Modules/Macros

• DFHLEPT@ DFHLEPTD DFHLEPTQ
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R000 PSY UI69227

     UP20/04/30 P F004 ¢

• R003 PSY UI69228

     UP20/04/30 P F004 ¢

• R100 PSY UI69229

     UP20/05/07 P F005 ¢

• R200 PSY UI69230

     UP20/04/29 P F004 ¢

Fix is available

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