PH64002: CICS REGION HANG UP WHEN THE QR TCB WENT IN MVS WAIT WITHOUT AN ACTIVE STIMER SET 24/11/11 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When there are no tasks to be dispatched CICS QR TCB goes into
  MVS Wait with a STIMERM set to wakeup QR TCB in a near future.
  During this process CICS may fail to set an active STIMERM which
  causes QR TCB enter into MVS WAIT leaving no active STIMERM set
  thus CICS will be waiting indefinitely until any interrupt
  occurs.
  Additional Symptoms and Keywords:
  KIXREVLHCF CICS hangup hangs
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users with UI96194 applied.         *
  ****************************************************************
  * PROBLEM DESCRIPTION: CICS appears to stall and not process   *
  *                      any work. The region was not short on   *
  *                      storage or at maxtask.                  *
  ****************************************************************
  PH60353 changed DFHDSDS3 and exposed this base code problem
  whereby an STIMER_ARRAY entry can contain a bad 5th byte instead
  of being rounded to the next tick boundary of 00, 40, 80 or
  C0 - i.e. quarter second boundaries, and the rest of the 2nd
  word zero.
  
  For example, the following STIMERM time in the STIMERM array is
  invalid because the 5th byte is D2 -
  
  DFEAA086 D2000000
  
  This means that the QR TCB can return to MVS with no active
  STIMERM to reawaken it. As this customer had no external work
  to post CICS back into life (no VTAM or MRO activity) and had
  ICV set to 5000, there was no cause for QR to wake up again.
  CICS entered a state where it appeared to be hung, with interval
  work waiting for interval control suspends that were not being
  honoured when they had expired.
  

Problem conclusion

• UI96194
  DFHDSDS3 has been changed to ensure that the STIMERM array
  contains a valid 5th byte in its time field i.e. 00, 40, 80 or
  C0.
  

Temporary fix

Comments

APAR Information

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

  PH63982

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

  UI99317

Modules/Macros

• DFHDSDS3
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R300 PSY UI99317

     UP24/12/10 P F412 {

Fix is available

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