PH23856: LOOP IN DEFERRED END OF TASK (EOT) ACE QUEUE CHAIN RESULTS IN ANABEND30D.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When End of Task (EOT) processing for an Allied thread is
  required, its Agent Control Element (ACE) block is added to
  a chain for deferred EOT processing by a service task.
  During this process, when building this deferred EOT ACE queue,
  its possible that an ACE block that already exists on the
  deferred EOT queue could get incorrectly added again,
  causing the ACE forward pointer chain to become corrupted.
  This corruption results in loop condition of the deferred
  EOT ACE queue which eventually causes Db2 to abnormally
  terminate with an ABENDS30D.
  Additional Keywords:
  S30D S30D S030D 030F 30D AB30D ABS30D LP
  ZSA45
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All Db2 for z/OS Version 12 users of                         *
  * the Db2 IMS Attachment Facility                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Db2 could terminate with ABENDS30D                           *
  * caused by a loop in termination                              *
  * processing.                                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply corrective PTF when available                          *
  ****************************************************************
  If an ACE is already on the deferred EOT chain, adding the
  same ACE to the chain could cause a loop in processing of
  the ACE deferred EOT chain which could lead to Db2
  terminating with ABENDS30D.
  

Problem conclusion

• Db2 is updated to avoid the loop in processing of the
  ACE deferred EOT chain leading to Db2 terminating with
  ABENDS30D by checking that an ACE is not already on the
  ACE deferred EOT chain before adding it to the chain.
  

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:

  UI69263

Modules/Macros

• DSN3EOT0
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RC10 PSY UI69263

     UP20/05/07 P F005 ¢

Fix is available

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