PK67651: LOOP IN IPI4PR91, IPI4PRA1, IPI4QMGR, OR ABEND0C4 IN IPI4PR91 OR IPI4PRA1

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• 1) LOOP: If the IMSPA internal queue high-water mark is hit
  and the P queue has no entries to free then a loop will occur.
  2. ABENDS0C4: If an ESAF thread abend causes a ROLB and
  reschedule of a transaction, the Recovery Token queue pointer
  is corrupted.
  

Local fix

• Work around by specifying minimum of REGION=6M since we are
  hitting high-water mark for internal queues and looping
  trying to free up storage.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS Performance Analyzer V4.1 users.     *
  ****************************************************************
  * PROBLEM DESCRIPTION: Loop occurring in IPI4PR91/IPI4PRA1/    *
  *                      IPI4QMGR or ABEND0C4 in IPI4PR91/A1.    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  This APAR is correcting the following problems:
  1. Loop occurring in IPI4PR91/IPI4PRA1/IPI4QMGR. If the IMSPA
  internal queue high-water mark is hit and the P queue has no
  entries to free then a loop will occur.
  2. ABEND0C4 in IPI4PR91/A1. If an ESAF thread abend causes a
  ROLB and reschedule of a transaction, the Recovery Token
  queue pointer is corrupted.
  

Problem conclusion

• The following changes have been made to correct these problems:
  1. Fix QMGR to always allow allocation of first entry for
     P queue, even if in high-water mark processing and
     ensure high-water mark is set to allow this.
     Possible workaround - increase REGION size.
  2. Fix pointer corruption.
  

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:

  UK37936

Modules/Macros

• IPIGGET  IPI4PRA1 IPI4PR91 IPI4QMGR
  

Fix information

• Fixed component name

  IMS PERF ANALYZ

• Fixed component ID

  5655E1500

Applicable component levels

• R410 PSY UK37936

     UP08/07/15 P F807

Fix is available

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