PH38856: RUNAWAY PROTECTION LEFT DISABLED AFTER ABEND 999 (AICA) CONDITION FOR A MIRROR TASK WITH ACTIVE HANDLE ABEND

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• WHEN A HANDLE ABEND ROUTINE GAIN CONTROL AFTER A LOOP IS
  DETECTED (ABEND AICA) FOR A MIRROR TASK THE RUNAWAY PROTECTION
  IS LEFT DISABLED ALLOWING A SECOND LOOP NOT BE DETECTED FOR THIS
  TASK
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: Runaway processing left disabled for    *
  *                      a CSMI transaction after an abend.      *
  ****************************************************************
  In the reported problem, a DPL was made to a server CICS
  region. The target program entered a loop, and CICS abended
  it AICA. DFHABAB stopped CICS runaway processing with a
  DFHKEDSI STOP_RUNAWAY_TIMER call. Abend percolation then
  returned back through the mirror tranaction's stack environment,
  and control then returned through the CICS transformers to the
  client CICS region once more.
    The same session then processed another DPL request from the
  client to the server CICS, and the existing CSMI transaction
  for that session handled the new link command. The target of
  the new DPL command also entered a loop. However, since the
  TAS of the CSMI transaction still had runaway detection
  suppressed (TAS_RUNAWAY_STOPPED was set on), DFHKETIX was not
  able to decrement TAS_RUNAWAY_LEFT to 0 and hence abend the
  looping transaction 999 / AICA. CICS was left with the mirror
  transaction application looping on the TCB of the running
  program.
  KEYWORDS: abendaica abend999 s999 loops ketix
  

Problem conclusion

• DFHMIRS recovery routine MIRRREC has been changed to issue
  a DFHKEDSI START_RUNAWAY_TIMER call as part of abend
  percolation processing. This ensures that the TAS for the
  mirror transaction is able to process runaway detection if the
  transaction is reused for another DPL request by the sending
  session.
  

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:

  UI77079 UI77080 UI77081

Modules/Macros

• DFHMIRS
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R100 PSY UI77081

     UP21/09/10 P F109 ¢

• R200 PSY UI77080

     UP21/09/10 P F109 ¢

• R300 PSY UI77079

     UP21/09/10 P F109 ¢

Fix is available

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