PM28378: BFIUSE COUNT GOES NEGATIVE CAUSING MANY DFSQBFM BLOCKS TO BE ACQUIRED EXHAUSTING STORAGE. IMS ABENDS ABENDS878 OR ABENDU0732.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The BFIUSE count went negative causing many Queue Buffers to be
  allocated but not used. The unused Queue Buffers exhausted
  storage and resulted in an ABENDS878 or ABENDU0732.
  A check of the QPOOL buffer statistics shows a buffer
  inuse count (BFIUSE) of x'7FFFFFFC' which is clearly
  invalid. This value exceeds the HI threshold value and causes
  Queue Buffer Manager module DFSQBFM0 to expand the number
  of Queue Buffers every time it is called even though additional
  buffers are not needed.
  Decrementing the BFIUSE count by 1 when it is already
  0 is a "should not occur" event.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS V11 Shared Queues Users              *
  ****************************************************************
  * PROBLEM DESCRIPTION: IMS abends with ABEND878 or ABENDU0732  *
  *                      after the BFIUSE count goes negative,   *
  *                      causing many Queue Buffers to be        *
  *                      allocated but not used.                 *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  The BFIUSE count (QPBFIUCT) went negative causing many Queue
  Buffers to be allocated but not used.  The unused Queue Buffers
  exhausted storage and resulted in an ABENDS878 (or ABENDU0732).
  A check of the QPOOL buffer statistics showed a buffer inuse
  count (BFIUSE) of x'7FFFFFFC' which is clearly invalid.  This
  value exceeded the HI threshold value and caused Queue Buffer
  Manager module DFSQBFM0 to expand the number of Queue Buffers
  every time it was called, even though additional buffers were
  not needed.  Decrementing the BFIUSE count by 1 when it is
  already zero should not occur.
  

Problem conclusion

• GEN:
  KEYWORDS:
   SYSPLEXSQ
  
  *** END IMS KEYWORDS ***
  Protection code was added to DFSQBFM0 to prevent it from
  decrementing the count in the QPBFIUCT field if it is already
  zero.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

  PM21267

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

  UK63564

Modules/Macros

• DFSQBFM0
  

Fix information

• Fixed component name

  IMS V11

• Fixed component ID

  5635A0200

Applicable component levels

• R100 PSY UK63564

     UP11/01/06 P F101 Ž

Fix is available

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